JP2007205860A - Method for evaluating durability of existing sign pole and baseline setting method for executing durability evaluation of existing sign pole - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method for evaluating durability of an existing sign pole, capable of checking safety of the existing sign pole without doing such operation that the existing sign pole is damaged thereby, or an operator gets close to the existing sign pole and carries out complicated works. <P>SOLUTION: The method comprises: an actual amplitude measurement step of measuring an actual amplitude value of a support post of the existing sign pole in a noncontact fashion; and a stress calculation step of calculating the bending stress of a base section of the existing sign pole based on the actual amplitude value. The stress calculation step obtains a dynamic amplitude value of the upper edge of the support post and a dynamic bending stress of the base section of the support post, and then brings a static tensile force to act on the head section of an arm member so that a static bending stress and a static bending value of the support post are made coincident with the dynamic amplitude value and the dynamic bending stress, and obtains a tensile angle of the static tensile force relative to the arm member, and then determines the durability of the existing sign pole by calculating a horizontal force and vertical force which act on the arm member, and a bending moment and a bending stress which act on the base section of the support post, based on corresponding tensile angle and actual amplitude value on the basis of above-mentioned correlation and a length ratio of the existing sign post. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a method for evaluating the durability of an existing sign post and a standard setting method for evaluating the durability of an existing sign post. In particular, a durability evaluation method for a cantilever-type existing sign post provided with a strut member erected at a predetermined place and an arm member extended to the upper end portion of the strut member and suspended from the sign, Further, the present invention relates to a standard setting method for evaluating durability of cantilever-type existing signposts.

  As a sign post for installing a sign such as a road sign, as shown in FIG. 1, a support member 10 standing at a predetermined place and an upper portion (upper end) of the support member 10 are extended. There is a cantilever-type marker column 1 configured in an inverted L shape with the attached arm member 11. A plurality of types of such cantilever-type marker pillars 1 having different ratios between the lengths of the support members 10 and the arm members 11 (hereinafter simply referred to as length ratios) are prepared as standard products. The sign pillars 1 prepared as these standard products are designed by a standard design method based on the allowable bending stress method, and the length corresponding to the place where the sign H is installed and the size of the sign H It is installed in a predetermined place after the one of the ratio is selected.

  By the way, the cantilever-type marker pillar 1 is installed in a place where installation environments are different from each other. That is, the sign post 1 is installed in different environments such as a flat road and an elevated road. For example, on a flat road, the influence of surrounding vibrations and wind acts as an external load on the sign post, and the elevated On the road, in addition to the influence of surrounding vibration and wind, vibration of the elevated road itself acts as an external load on the sign post.

  However, since each cantilever-type marker pillar 1 is prepared as a standard product, an external load that deviates from the design condition may be applied depending on the installation environment. In other words, in an environment in which vibration is applied to the sign post 1 (for example, a bridge or an elevated road in which the natural frequency matches and causes the sign post 1 to resonate), the installed sign post 1 greatly oscillates and the post member 10 In some cases, a bending stress exceeding the set value may be generated at the base portion.

  However, since the bending stress generated at the base of the column member 10 cannot be grasped even if the swing of the column member 10 of the installed marker column (existing marker column) 1 can be visually recognized, A plurality of strain gauges are attached to the base of the column member 10 of the marker column 1 to measure the strain, a bending stress is calculated from the strain, or an amplitude measuring device is attached to the column member to measure the amplitude amount. To determine the safety of the existing marker column 1 (for example, whether or not the bending stress is within the allowable stress and whether there is a possibility of fatigue failure) Etc.).

  When calculating the bending stress of the existing marker column 1 based on the data (strain) measured with the strain gauge as described above, a complicated operation of attaching a plurality of strain gauges to the column member is essential. There is a problem that work must be performed for a long time even in a very dangerous place with a large amount of traffic. In addition, when using a strain gauge, the base of the column member 10 must be partially scraped to attach the strain gauge, and coating is performed to prevent rust from occurring on the shaved portion after measurement. Work is necessary. In addition, scraping (damaging) the existing marker column 1 (the column member 10) to attach the strain gauge causes a decrease in strength and is a problem in ensuring safety.

  In addition, the cantilever-type existing marker column 1 is such that the arm member 11 extends from the upper portion of the column member 10 and has an inverted L-shape, and a dynamic condition such as vibration is added, so that amplitude measurement is performed. Even if the deflection of the upper end of the strut member is measured with a measuring instrument, the bending stress actually generated at the base of the strut member 10 can be calculated from a general formula (such as a flexure formula) assuming a static state. However, there is a problem that a finite element analysis that requires specialized knowledge must be performed in consideration of dynamic conditions (vibration conditions) and the like.

  Therefore, in view of such circumstances, the present invention makes it easy to improve the safety of an existing sign post from a general formula for a static state without performing an operation that hurts an existing sign post or a complicated operation. It is an object of the present invention to provide an endurance evaluation method for an existing sign post that can be reliably evaluated, and a standard setting method used therefor.

  The durability evaluation method for an existing sign post according to the present invention includes a support member standing at a predetermined location and an arm member extending in an orthogonal direction on the support member and attached with a predetermined sign A method for evaluating the durability of the existing sign post, which is generated at the base of the post member from the actual amplitude amount measuring step of measuring the actual amplitude amount in the horizontal direction at the upper end of the post member of the existing post. A stress calculation step for calculating a bending stress, and an evaluation step for determining whether or not the existing marker column is durable based on the calculated bending stress, wherein the stress calculation step includes a length ratio between the support member and the arm member. For each of a plurality of standard sign pillars with different diameters, obtain the horizontal dynamic amplitude at the upper end of the column member and the dynamic bending stress at the base of the column member when installed in a vibration environment. In addition, a number of standard standards installed in a static environment For each column, the horizontal static deflection at the top end of the column member and the static bending stress at the base of the column member will match the dynamic amplitude and dynamic bending stress of the corresponding standard marker column. From the correlation between the length ratio and the tension angle set in advance by obtaining the tensile force with respect to the tip of the arm member and the tension angle with respect to the arm member, The corresponding tensile angle is obtained based on the length ratio with the arm member, and the horizontal force and vertical force acting on the tip of the arm member are calculated from the general deflection equation based on the tensile angle and the actual amplitude, and the horizontal force is calculated. The bending stress acting on the base of the support member is calculated from the bending moment acting on the base of the support member calculated using the general moment calculation formula based on the force and the normal force. Here, the “vibration environment” refers to an environment in which vibration is applied to the standard marker column, and is an environment in which a predetermined acceleration is applied to the standard marker column at a predetermined period (eg, natural frequency). On the other hand, the “static environment” means an environment in which the standard sign post does not vibrate. The “amplitude amount” means a displacement amount from the center position of vibration.

  According to such a method for evaluating the durability of the existing marker pillar, as an operation for the existing marker pillar, it is only necessary to measure the actual amplitude amount in the horizontal direction at the upper end of the pillar member of the existing marker pillar in the actual amplitude amount measuring step. The work is very easy.

  Further, in the stress calculation step of calculating the bending stress acting on the base of the column member based on the acquired actual amplitude, each of the plurality of standard marker columns having different length ratios between the column member and the arm member. On the other hand, the horizontal dynamic amplitude at the upper end of the strut member when installed in a vibration environment and the dynamic bending stress at the base of the strut member are obtained, and a plurality of components are installed in a static environment. For each of the standard marker columns, the horizontal static deflection at the upper end of the column member and the static bending stress at the base of the column member match the dynamic amplitude and dynamic bending stress of the corresponding standard column. From the correlation between the length ratio and the tension angle set in advance by obtaining the tensile force with respect to the tip of the arm member to be determined and the tension angle with respect to the arm member, Length of support member and arm member Based on the horizontal angle and the vertical force, the horizontal and vertical forces acting on the tip of the arm member are calculated from the general deflection formula based on the tensile angle and the actual amplitude. In order to calculate the bending stress acting on the base of the strut member from the bending moment acting on the base of the strut member calculated from the general moment calculation formula, even if the data acquired at the site is only the actual amplitude amount, The bending stress actually acting can be easily calculated.

  Specifically, when a tensile force is applied to the tip of the arm member of the standard sign post installed in a static environment, the amount of deflection in the horizontal direction of the upper end of the post member of the standard sign post (static Bending stress (static bending stress) generated at the base of the column member of the standard marker column, and the amplitude amount (dynamic amplitude amount) in the vibration environment (dynamic environment) coincides with each other. The combination of the tensile force and the tensile angle (the working angle with respect to the arm member) that matches the bending stress in the dynamic environment (dynamic bending stress) is the length ratio of the strut member to the arm member (below) There is only one set for each.

  For this reason, such a tensile angle can be treated as a parameter (coefficient) that makes it possible to apply a dynamic environment (condition) premised on a static environment (condition). . Therefore, when the tension angle is reflected in a general deflection equation for static conditions (environment), the deflection equation indicates that the actual amplitude in the horizontal direction at the upper end of the column member of the existing sign post in the vibration environment It includes a dynamic coefficient that can be applied as a deflection.

  And from the correlation between the length ratio and the tension angle set in advance by determining the tension angle for each of the plurality of standard sign pillars having different length ratios, the length ratio of the existing sign pillars to be evaluated is calculated. Based on this, the tensile angle corresponding to the existing marker column can be determined.

  Therefore, in the stress calculation process, a bending type reflecting the tension angle corresponding to the length ratio of the existing marker column to be evaluated (since the existing marker column is a cantilever type, a concentrated load is applied to the tip of the column member. If the actual amplitude of the existing marker column is applied to the bending type in the state of acting and the bending type in the state where the bending moment is applied to the upper end of the column member), the existing installation in the vibration environment The tensile force (the tensile force acting on the tip of the arm member) that becomes the same state as the marker column (stress generated at the base of the column member and amplitude amount (deflection amount)) can be obtained. Then, a horizontal force and a vertical force, which are component forces of the tensile force, are calculated. In other words, considering the form of the existing sign post, the vertical and horizontal two-component forces from the one-component tensile force acting on the arm member with a tensile angle using a general deflection formula. calculate.

  Then, the horizontal and vertical forces are applied to a general moment formula, the bending moment generated at the base of the strut member is calculated for each force component, and the sum of this bending moment is applied to the base of the strut member. The bending stress generated at the base portion of the support member can be calculated from a general stress calculation formula.

  The bending stress calculated in this way is obtained using a general formula that assumes a static environment, but it is a dynamic environment compared to that that assumes a static environment (condition). Since it is derived by reflecting the tensile angle as a parameter that can be applied on the premise of (condition), it is equal to the bending stress actually generated in the base portion of the column member in the dynamic environment (vibration environment) or It becomes almost equal. Therefore, it is possible to accurately evaluate the durability of the existing marker column from the calculated bending stress.

  The standard pulling angle may be obtained by actually preparing a standard marking column and actually carrying out dynamic and static experiments. For example, the standard marking column is modeled and finite element analysis is performed. Of course, it may be obtained by performing a virtual experiment (analysis). In other words, once the correlation between the length ratio as a reference and the tensile angle is set for a plurality of standard marker columns, the actual amplitude of each marker column is used to determine the bending stress based on the correlation. Since it can be calculated, if a reliable standard is set using finite element analysis only when obtaining the tensile angle as a parameter (when setting the correlation between the length ratio and the tensile angle), A reliable evaluation result can be obtained without performing a complicated analysis in the above work.

  As described above, it is only necessary to measure the dynamic amplitude of the upper end of the pillar member of the existing sign post on site, and if the relative relationship between the length ratio and the tension angle is set in advance, the subsequent work can be performed. It is not necessary to perform any complicated analysis such as finite element analysis, and even a worker who lacks specialized knowledge such as analysis can easily and reliably evaluate the safety of existing signposts using a general formula. it can.

  In the actual amplitude amount measuring step, the actual amplitude amount in the horizontal direction at the upper end of the column member may be calculated based on a moving image or a still image obtained by photographing the existing marker column. That is, the actual amplitude amount may be ascertained based on image data captured by a video camera or a digital camera. In this way, as an on-site work to determine the actual amplitude amount of the upper end of the pillar member in the existing sign post, the operator can only shoot remotely without approaching the place where the existing sign post is installed. Good. Then, in order to obtain the actual amplitude amount from the captured moving image or still image, the horizontal amplitude amount of the upper end of the support member (by analyzing the displayed image or actually measuring the displayed image) ( Shake amount).

  The standard setting method for evaluating the durability of the existing sign pillar according to the present invention includes a support member standing at a predetermined location, and an upper part of the support member extending in an orthogonal direction and attached with a predetermined sign. A standard setting method for evaluating the durability of an existing signpost made up of arm members, each of a plurality of standard signposts having different length ratios between the support members and the arm members On the other hand, a dynamic data acquisition process for obtaining the horizontal dynamic amplitude amount at the upper end of the column member and the dynamic bending stress at the base of the column member when installed in a vibration environment, For each of a plurality of standard marker columns in the state, the amount of static deflection in the horizontal direction of the upper end of the column member and the static bending stress of the base of the column member correspond to the amount of dynamic amplitude and dynamic bending of the standard marker column. Tensile force and arm member against the tip of the arm member that will match the stress The static data acquisition process for determining the tension angle for the test object, and the correlation between each tension angle obtained in the static data acquisition process and the length ratio for each standard marker pillar, And a function setting step of setting as a reference function for obtaining a tensile angle for calculating the bending stress of the base portion of the support member from the amplitude amount. Here, the “vibration environment” refers to an environment in which vibration is applied to the standard marker column, and is an environment in which a predetermined acceleration is applied to the standard marker column at a predetermined period (eg, natural frequency). On the other hand, the “static environment” means an environment in which the standard sign post does not vibrate. The “amplitude amount” means a displacement amount from the center position of vibration.

  According to the reference setting method for evaluating the durability of the existing marker pillar, in the function setting step, the static data acquisition step based on the dynamic amplitude amount and the dynamic bending stress obtained in the dynamic data acquisition step The tension angle for calculating the bending stress of the base of the column member from the actual amplitude amount of the existing marker column to be evaluated with respect to the correlation between each tensile angle obtained in step 1 and the length ratio for each standard marker column Therefore, even if the actual data is only the actual amplitude, the tensile angle and actual amplitude obtained from the function (correlation between the length ratio and the tensile angle) are set. By applying to the general formula, it is possible to easily calculate the bending stress actually acting on the existing marker column.

  Specifically, when a tensile force is applied to the tip of the arm member of the standard sign post installed in a static environment, the amount of deflection in the horizontal direction of the upper end of the post member of the standard sign post (static Bending stress (static bending stress) generated at the base of the column member of the standard marker column, and the amplitude amount (dynamic amplitude amount) in the vibration environment (dynamic environment) coincides with each other. The combination of the tensile force and the tensile angle (the working angle with respect to the arm member) that matches the bending stress in the dynamic environment (dynamic bending stress) is the length ratio of the strut member to the arm member (below) There is only one set for each.

  For this reason, such a tensile angle can be treated as a parameter (coefficient) that makes it possible to apply a dynamic environment (condition) premised on a static environment (condition). . Therefore, when the tension angle is reflected in a general deflection equation for static conditions (environment), the deflection equation indicates that the actual amplitude in the horizontal direction at the upper end of the column member of the existing sign post in the vibration environment It includes a dynamic coefficient that can be applied as a deflection.

  Then, the tension angle is obtained for each of the plurality of standard marker columns having different length ratios in the static data acquisition process, and the correlation between the length ratio and the tension angle is set as a reference function in the function setting process. If so, based on the function (correlation between the length ratio between the strut member and the arm member and the tension angle), the tension angle corresponding to the existing sign pillar based on the length ratio of the existing sign pillar to be evaluated Will be understood.

  Therefore, a bending type reflecting the tension angle corresponding to the length ratio of the existing marker column to be evaluated (the existing marker column is a cantilever type, so that a concentrated load is applied to the tip of the column member. When the actual amplitude amount of the existing marker column is applied to the deflection equation and the deflection equation with the bending moment acting on the upper end of the column member), the same state as the existing marker column in the vibration environment The tensile force (the tensile force acting on the tip of the arm member) that becomes (the stress generated in the base portion of the support member and the amplitude amount (deflection amount)) can be obtained. Then, a horizontal force and a vertical force, which are component forces of the tensile force, are calculated. In other words, considering the form of the existing sign post, the vertical and horizontal two-component forces from the one-component tensile force acting on the arm member with a tensile angle using a general deflection formula. calculate.

  Then, the horizontal and vertical forces are applied to a general moment formula, the bending moment generated at the base of the strut member is calculated for each force component, and the sum of this bending moment is applied to the base of the strut member. The bending stress generated at the base portion of the support member can be calculated from a general stress calculation formula.

  The bending stress calculated in this way is obtained using a general formula that assumes a static environment, but it is a dynamic environment compared to that that assumes a static environment (condition). Since it is derived by reflecting the tensile angle as a parameter that can be applied on the premise of (condition), it is equal to the bending stress actually generated in the base portion of the column member in the dynamic environment (vibration environment) or It becomes almost equal. Therefore, it is possible to accurately evaluate the durability of the existing marker column from the calculated bending stress.

  In the dynamic data acquisition step and the static data acquisition step, a standard marker column may be actually produced and a dynamic and static experiment may be actually performed. Of course, a virtual experiment (analysis) may be performed using finite element analysis or the like. In other words, once the correlation between the length ratio as a reference and the tensile angle is set for a plurality of standard marker columns, the actual amplitude of each marker column is used to determine the bending stress based on the correlation. Since it can be calculated, if a reliable standard is set using finite element analysis only when obtaining the tensile angle as a parameter (when setting the correlation between the length ratio and the tensile angle), A reliable evaluation result can be obtained without performing a complicated analysis in the above work.

  Therefore, it is only necessary to measure the dynamic amplitude of the upper end of the pillar member of the existing sign post on site, and if the relative relationship between the length ratio and the tension angle is set in advance, finite element analysis will be performed in the subsequent work. It is not necessary to perform any complicated analysis such as the above, and even a worker who lacks specialized knowledge such as analysis can easily and reliably evaluate the safety of the existing signpost using the general formula.

  As described above, according to the present invention, it is possible to easily and reliably evaluate the safety of an existing marker column without performing an operation that hurts an existing marker column or a complicated operation. Can play.

  Hereinafter, an embodiment of the present invention will be described with reference to the accompanying drawings.

  The present embodiment relates to a method for determining the durability (durable safety) of an existing sign post for installing a sign such as a road sign, and a method for setting a standard used for the determination.

  As shown in FIG. 1, the existing marker column for which the durability is judged is a column member 10 erected at a predetermined location, and is extended to the upper end portion of the column member 10, and a marker H is attached. This is a so-called cantilever-type sign post that is constructed in an inverted L shape with the arm member 11. A plurality of types of such cantilever-type marker columns having different ratios between the length of the column member 10 and the length of the arm member 11 based on the length of the column member 10 are prepared as standard products. It is installed after being appropriately selected according to the size of the road sign H to be installed and the conditions of the place of installation. These standard products are designed by a standard design method based on a permissible bending stress method after assuming a predetermined environment (dynamic condition or static condition).

  The durability evaluation method for the existing sign post 1 according to the present embodiment includes a reference setting step for determining a reference for inducing bending stress generated at the base of the post member 10 of the existing sign post 1, and the post of the existing sign post 1. Based on the actual amplitude amount measuring step for measuring the actual amplitude amount in the horizontal direction at the upper end of the member 10, the stress calculating step for calculating the bending stress generated in the base portion of the column member 10 from the actual amplitude amount, and the calculated bending stress. And an evaluation process for determining whether or not the existing sign post 1 is durable.

  In the reference setting step, the upper end of the column member in a state where it is installed in a vibration environment with respect to each of the plurality of standard marker columns 1 ′ having different length ratios between the column member 10 and the arm member 11. A dynamic data acquisition process for determining the horizontal dynamic amplitude and the dynamic bending stress of the base of the column member, and for each of a plurality of standard marker columns 1 '' ... in a static environment The amount of dynamic amplitude of the standard marker column 1 ′ corresponding to the horizontal static deflection amount of the upper end of the column member 10 (the upper end of the column member) and the static bending stress of the base of the column member 10 (base of the column member). And a static data acquisition step for obtaining a tensile force with respect to the tip of the arm member 11 (tip of the arm member) and a tensile angle with respect to the arm member 11 that coincide with the dynamic bending stress, and a static data acquisition step. The length for each tension angle and each standard marker column 1 '... And a function setting step for setting the correlation with the function as a reference function for deriving the tensile angle for calculating the bending stress of the base portion of the column member 10 from the actual amplitude amount of the existing marker column 1 to be evaluated. The

The dynamic data acquisition step is performed by an actual experiment or a virtual experiment by analysis.
First, a case where an actual experiment is performed will be described in detail. As shown in FIG. 2, a cantilever-type marker column including a column member 10 and an arm member 11 to which a marker H is attached is provided as in the standard product. Is set as a standard sign post (hereinafter referred to as a first standard sign post) 1 ′ for setting a reference.

  The length of the support member 10 is the same, but the length of the arm member 11 is different, that is, the length ratio between the support member 10 and the arm member 11 (hereinafter referred to as the support member 10 and the arm member). A plurality of first standard labeling pillars 1 '... Having different length ratios to 11 are simply prepared.

  Further, in addition to the first labeling standard column 1 ', a vibration generating device 100 that provides vibrations to the first standard marking column 1' is prepared. The vibration generating device 100 includes a base 101 on which the first standard marking pillar 1 ′ is installed and a vibration device 102 that applies vibration to the base 101, and the vibration generator 102 drives the vibration through the base 101. It can be vibrated with a sine wave to one standard marker column 1 '. In addition, since this experiment is for setting the reference | standard for evaluating the safety | security of the existing marker pillar 1, it can grasp | ascertain a mechanical disadvantageous condition (condition) with respect to 1st standard marker pillar 1 '. It is preferable to vibrate at a frequency that coincides with the natural frequency of the first standard marker column 1 ′, that is, so that the first standard marker column 1 ′ resonates.

  Then, the first standard sign post 1 ′ is installed on the base 101, an amplitude measuring device (not shown) is attached to the upper end of the support member 10 of the first standard sign post 1 ′, and a strain gauge is attached to the base of the support member 10. Attach G.

  Then, as shown in FIGS. 2 and 3, the vibration is driven by the vibration device 102 to vibrate the standard marker column 1 ′ (S10), and the maximum amplitude amount of the upper end of the column member 10 (dynamic Amplitude) W ′ is measured, and the strain at the base of the column member 10 is measured with the strain gauge G (S20). Based on the measured strain (data), the base at the base of the column member 10 at the maximum amplitude is measured. A bending stress (dynamic bending stress) is obtained (S30).

  When the experiment is not performed on another first standard marker column 1 ′ having a different length ratio between the column member 10 and the arm member 11 (NO in S40), the above steps are performed in the same manner. The dynamic amplitude amount W ′ and the dynamic bending stress are obtained for each first standard marker column 1 ′ (S10 to S30). When the measurement of the dynamic amplitude amount W ′ and the calculation of the dynamic bending stress are completed for all the set (produced) first standard marker columns 1 ′ (YES in S40), the dynamic data acquisition step Is completed (END).

  On the other hand, when conducting a virtual experiment, the first standard sign post 1 ′ is modeled, vibration conditions are given as dynamic parameters, and the modeled first standard sign post 1 ′ is virtually excited. (S10). Then, the horizontal maximum amplitude (dynamic amplitude) W ′ at the upper end of the support member 10 and the bending stress (dynamic bending stress) of the base of the support member 10 at the maximum amplitude are obtained by finite element analysis (S20, S30). The parameter is set as a dynamic condition that the first standard marker column 1 ′ is vibrated with a sine wave as in the actual experiment. In this case as well, the parameter is vibrated at a frequency (resonance frequency) that matches the natural frequency of the first standard marker column 1 ′ so as to be in the most unfavorable state for the first standard marker column 1 ′. Is preferably set as a dynamic condition.

  And when it is not experimenting with other 1st standard label | marker pillar 1 'which makes the length ratio of the support | pillar member 10 and the arm member 11 different (it is NO at S40), the above-mentioned process is performed similarly. The dynamic amplitude amount W ′ and the dynamic bending stress are obtained for each first standard marker column 1 ′ that has been modeled (S10 to S30). When the calculation of the dynamic amplitude W ′ and the dynamic bending stress is completed for all the modeled first standard marker columns 1 ′ (YES in S40), the dynamic data acquisition process is completed (END). ).

The static data acquisition step is performed by an actual experiment or a virtual experiment by analysis, as in the dynamic data acquisition step.
First, the actual experiment will be described in detail. As shown in FIG. 4, a cantilever-type marker column having the same form as that of the first standard marker column 1 ′ used in the dynamic data acquisition process is shown in FIG. It is set as a standard marker column (hereinafter referred to as second standard marker column) 1 ″ used in the data acquisition process.

  A plurality of second standard marker pillars 1 ′ having different lengths of the arm members 11, that is, a plurality of second standard marker pillars 1 ′, which have the same length of the column member 10, are prepared. . Of course, the plurality of first standard marker columns 1 ′ used in the dynamic data acquisition process may be used as the second standard marker columns 1 ″ used in the static data acquisition process.

  Then, the second standard sign post 1 ″ is installed in a static environment (an environment in which vibration is not applied to the standard sign post 1 ′), and an amplitude measuring device is installed at the upper end of the support member 10 of the second standard sign post 1 ″. And a strain gauge G is attached to the base of the column member 10.

  4 and 5, a rope, a chain, or the like (not shown) is connected to the tip of the arm member 11, and the rope or the like is in a state along the axis of the arm member 11 and the support member 10 (the arm member 11). And pulling the arm member 11 (on the axis center of the arm member 11) at an angle with respect to the arm member 11 (on the virtual plane through which the axis of the column member 10 passes) (for example, winding up with a winch), the second standard marker column 1 At the tip of the arm member 11, a static tensile force P ′ is applied to the axis of the arm member 11 with an operating angle (tensile angle) θ ° (S 100). And the dynamic data acquisition with respect to the 1st standard label | marker pillar 1 'to which the horizontal direction deflection amount (static deflection amount) (delta)' produced by the effect | action of the tension | pulling force P 'corresponds to length ratio is equivalent. Dynamic with respect to the first standard marking column 1 ′ corresponding to the length ratio of the bending stress (static bending stress) generated in the base portion of the column member 10 and the dynamic amplitude amount W ′ obtained in the process coincides with each other. It is determined whether the dynamic bending stress obtained in the data acquisition process matches (S110). If the static deflection amount δ ′ and the static bending stress do not match the dynamic amplitude amount W ′ and the dynamic bending stress (NO in S110), at least one of the tensile force P ′ and the tensile angle θ ° is set. Change (120) to find a state where the static deflection amount δ ′ and the static bending stress coincide with the dynamic amplitude amount W ′ and the dynamic bending stress. When the static deflection amount δ ′ and the static bending stress coincide with the dynamic amplitude amount W ′ and the dynamic bending stress (YES in S110), the tensile angle θ ° in that state is a piece of the length ratio. It is determined as a standard for the hand-held sign post (S130).

  And when it is not experimenting with other 2nd standard label | marker pillar 1 '' ... which makes the length ratio of the support | pillar member 10 and the arm member 11 different (it is NO at S140), the above-mentioned process is performed. In the same manner, the tensile angle θ ° is obtained for each second standard marker column 1 ″ (each length ratio) (S100 to S130). When the tensile angle θ ° is determined for all the set (produced) second standard marker columns 1 ″ (YES in S140), the static data acquisition process is completed.

  On the other hand, when performing a virtual experiment, the second standard marker column 1 ″ is modeled, and static load conditions (tensile force P and tensile angle θ °) on the arm member are given as parameters (S100). . Then, the horizontal deflection amount (static deflection amount) δ ′ of the tip of the column member 10 of the second standard marker column 1 ″ and the bending stress (static bending stress) generated at the base of the column member 10 by finite element analysis. ) And the amount of static deflection δ ′ at the tip of the column member 10 and the amount of dynamic amplitude W ′ obtained in the dynamic data acquisition step for the first standard marker column 1 ′ corresponding to the length ratio. It is determined whether or not the static bending stress of the base portion of the column member 10 and the dynamic bending stress obtained in the dynamic data acquisition step for the first standard marker column 1 ′ corresponding to the length ratio match. (S110). When the static deflection amount δ ′ and the static bending stress do not match the dynamic amplitude amount W ′ and the dynamic bending stress (NO in S110), the tensile force P and the tensile angle θ ° as static load conditions At least one of these is changed (120), and a state is found in which the static deflection amount δ ′ and the static bending stress coincide with the dynamic amplitude amount W ′ and the dynamic bending stress. When the static deflection amount δ ′ and the static bending stress coincide with the dynamic amplitude amount W ′ and the dynamic bending stress (YES in S110), the tensile angle θ ° in that state is a piece of the length ratio. It is determined as a standard for the hand-held sign post (S130).

  And when analysis (virtual experiment) is not performed with respect to the other second standard marker pillars 1 ″... Having different length ratios between the column member 10 and the arm member 11 (NO in S140). The above-described steps are performed in the same manner to obtain the reference tensile angle θ ° for each second standard marker column 1 ″ (each length ratio) (S100 to S130). When the tensile angles are determined for all the modeled second standard mark columns 1 '' (YES in S140), the static data acquisition process is completed.

  In the function setting step, the correlation between the plurality of tensile angles θ ° obtained in the static data acquisition step for each second standard marker column 1 ″ and the length ratio corresponding to each tensile angle θ ° is calculated. It is set as a function used as a reference in the stress calculation process (S150).

  In the function setting step according to the present embodiment, by creating a graph A (see FIG. 6) showing the function representing the correlation between the tensile angle θ ° and the length ratio as an approximate line BL (S150), the stress The standard used in the calculation process is determined (END). A function indicating the correlation between the length ratio and the tensile angle θ ° can be expressed by a linear expression, and the approximate line BL appears as a proportional straight line in which the tensile angle θ ° increases as the length ratio increases. . The function as a reference used in the stress calculation step may be graphed as an approximate line in this way, but may be set as an equation.

  In the actual amplitude measuring step, as shown in FIG. 7, the operator goes to the site and photographs the existing marker pillar 1 as a moving image or a still image with a video camera or a digital camera (S200). At this time, as shown in FIG. 8, in order to take an image in which the amplitude in the direction along the axis of the column member 10 and the axis of the arm member can be grasped, a fixed point S facing both the column member 10 and the arm member 11 is taken. Camera C is installed to take a picture.

  Then, as shown in FIG. 9, shooting is performed so that at least the upper end portion of the column member 10 is imprinted in the shooting region E in the entire column member 10. Returning to FIG. 7, the maximum amplitude amount (actual amplitude amount) W in the horizontal direction of the upper end of the column member 10 is obtained by image analysis of the captured moving image or actual measurement from the moving image or the still image (S210). Specifically, when photographing the existing sign pillar 1 as a moving image and analyzing the image, an edge (contour) is detected with respect to the image of the tip portion of the column member 10, and a stationary state and a maximum shake state are detected. The difference in the position of the edge in the horizontal direction (edge displacement) is determined by the number of pixels, and the number of pixels corresponding to the upper end (outer diameter) of the existing marker column 1 (post member 10) and the actual size of the image The scale (ratio) is calculated, and the maximum actual amplitude amount W in the horizontal direction of the upper end of the support member 10 can be obtained from the number of pixels as the edge displacement based on the scale.

  In addition, when actually measuring from a moving image or a still image, using a measure or the like, the distance between the stationary state and the maximum swinging state is measured with a position that can be specified (for example, the center of the upper end of the support member 10) as a reference point, A scale (scale) is determined based on the relationship between the actual dimensions of the image corresponding to the tip of the existing sign post 1 (post member 10) (for example, the outer diameter of the upper end of the post member 10 projected on the image), and the scale is measured. The actual amplitude amount W in the horizontal direction at the upper end of the column member 10 can be obtained by reflecting the result in the measured dimensions. When a still image is actually measured, it is necessary to measure the distance between the reference points by photographing the stationary state and the maximum shake state from the same fixed point S and comparing the two images.

  In the stress calculation step, first, a length ratio between the column member 10 and the arm member 11 in the existing marker column 1 which is a target for measuring the actual amplitude amount W in the actual amplitude amount measurement step is obtained, and based on the length ratio. A tensile angle θ ° corresponding to the length ratio is obtained from the approximate line (graph) or the linear expression set in the function setting step (S220).

  Then, based on the tensile angle θ ° and the actual amplitude amount W obtained in the actual amplitude amount measuring step, the bending stress of the base portion of the column member 10 of the existing marker column 1 is obtained from a general formula assuming a static environment. (Bending stress generated in a dynamic environment) is calculated (S230).

  Here, the concept of calculating the bending stress generated in a dynamic environment from a static general formula will be described in detail. A tensile force P is applied to the tip of an arm member of a standard marker column installed in a static environment. , The amount of static deflection in the horizontal direction of the upper end of the column member 10 of the cantilever-type standard marker column 1 '' matches the amount of dynamic amplitude W ′ in a dynamic environment, and The tensile force P and the tensile angle (the action on the arm member) in which the static bending stress generated at the base of the column member 10 of the standard marker column 1 ″ matches the dynamic bending stress in a dynamic environment. There is only one combination of (angle) θ ° for each length ratio of the column member 10 and the arm member 11. For this reason, the tensile angle θ ° obtained in the static data acquisition process can be applied based on a dynamic environment (conditions) as opposed to a static environment (conditions). It can be handled as a parameter (coefficient).

  Then, if the tension angle θ ° is obtained for each of the plurality of standard indicator pillars 1 ″... With different length ratios, and the correlation between the length ratio and the tension angle is set in advance as a reference function, Based on the function, the tensile angle θ ° corresponding to the existing marker column 1 can be determined from the length ratio of the existing marker column 1 to be evaluated.

  Then, the amplitude (dynamic condition) of the existing marker column 1 (the column member 10) under the vibration environment can be applied to a general deflection formula assuming a static environment (can be treated as a deflection). In addition, after reflecting the tension angle θ ° corresponding to the length ratio of the existing marker column 1 to be evaluated in a deflection type, the actual amplitude amount W is applied and the arm member 11 acting on the tip of the arm member 11 is applied. The axial force (hereinafter referred to as horizontal force) Px and the axial force (hereinafter referred to as vertical force) Py of the column member 10 are calculated. That is, since the object of evaluation according to the present embodiment is an inverted L-shaped cantilever-type existing marker column 1, the column member 10 is bent due to a tensile force acting on the tip of the arm member 11. Then, a concentrated load and a bending moment act on the tip of the column member 10, so that a bending type in a state where the concentrated load acts on the tip of the column member 10 and a bending moment on the tip of the column member 10 are obtained. Based on a combination formula (a combination formula reflecting the tensile angle θ °) with a deflection formula in a state where the tension acts, a tensile force P acting with a tensile angle θ ° is calculated, and then the tensile force P The horizontal force Px and the vertical force Py are calculated at the tip of the arm member 11 from the pulling angle θ °.

  Then, the bending moment of each component described above is calculated from the horizontal force Px and the vertical force Py using a general moment formula, and the base portion of the column member 10 is calculated from the bending moment using a general stress calculation formula. Calculate the bending stress.

The stress calculation including the calculation process of the horizontal force Px and the vertical force Py will be described in detail. As described above, on the premise that the concentrated load and the bending moment are applied to the tip of the column member 10, the column member The horizontal deflection at the upper end of 10 (the axial direction of the arm member 11) is the sum of the deflection due to the action of the axial force Px of the arm member 11 and the deflection of the support member 10 due to the axial force Py. . Accordingly, δ: deflection in the horizontal direction (amplitude) at the upper end of the column member 10, δx: deflection (amplitude) due to the axial force Px of the arm member 11, δy: deflection (amplitude) due to the axial force Py of the column member 10 ),given that,
δ = δx + δy (Formula 1)
It becomes. And if θ is a tensile angle, P is a force acting along the tensile angle (tensile force), Px is a horizontal force, Py is a vertical force,
The relationship between the tensile force P and the horizontal force Px, which is the component force, is
Px = Pcosθ (Formula 2)
Can be expressed as
The relationship between the tensile force P and the normal force Py which is the component force is as follows:
Py = Psinθ (Formula 3)
It can be expressed as.

Therefore, δx: Deflection due to the action of the horizontal force Px, δy: Deflection due to the action of the vertical force Py, θ: Tensile angle, L: Length of the strut member 10, L ′: Length of the arm member 11, E: Young's modulus , I: sectional moment of inertia, the deflection (amplitude) δx due to the action of the horizontal force Px is
δx = Pcos θ × L ³ / (3 × E × I) (Formula 4)
The deflection (amplitude) δy due to the action of the normal force Py is
δy = (Psinθ × L ′) × L ² / (2 × E × I) (Formula 5)
It becomes. Therefore, if Equation 4 and Equation 5 are substituted into Equation 1, the horizontal deflection δ at the upper end of the column member 10 is
δ = Pcos θ × L ³ / (3 × E × I) + (Psin θ × L ′) × L ² / (2 × E × I) (Formula 1 ′)
It becomes.

  For this equation 1 ′, the actual amplitude amount W obtained in the actual amplitude amount measurement step is substituted as the horizontal deflection (amplitude) δ at the upper end of the column member 10, and a function (approximate) is applied to the tensile angle θ °. Substituting the tensile angle θ ° obtained from the line BL or the mathematical expression), the tensile force P corresponding to the actual amplitude W can be obtained. Substituting the tensile force P and the tensile angle θ ° into Equations 2 and 3 For example, the component force of the tensile force P, that is, the horizontal force Px and the vertical force Py can be obtained.

Mx: bending moment generated at the base of the column member 10 by the horizontal force Px, My: bending moment generated at the base of the column member 10 by the vertical force Py, Px: horizontal force, Py: vertical force, L: of the column member 10 Length, L ′: the length of the arm member 11,
Mx = Px × L (Expression 6)
My = Py × L ′ (Expression 7)
Can be expressed as

Since the bending moment resulting from the bending stress at the base of the column member 10 is a combination of the bending moment and the bending moment due to the vertical force due to the horizontal force Px, the stress calculation for obtaining the bending stress generated at the base of the column member 10 is calculated. ceremony,
σ: Bending stress at the base of the column member 10, Mx: Bending moment generated at the base of the column member 10 by the horizontal force Px, My: Bending moment generated at the base of the column member 10 by the vertical force Py, M: Base of the column member 10 Bending moment resulting from the bending stress, k: 1/2 of the outer diameter of the support member 10, I: secondary moment of section,
σ = (Mx + My) × k / I = M × k / I (Equation 8)
It can be expressed as.

  Therefore, to handle the dynamic environment conditions as the static environment conditions (so that the data obtained from the dynamic environment (data) can be applied to the one that assumes the static environment (expression)) As a parameter), the tension angle θ ° corresponding to the length ratio of the existing marker column 1 is applied, so that the actual amplitude amount W of the existing marker column 1 in the dynamic environment as described above is statically reduced. Therefore, the actual bending stress (bending stress generated in a dynamic environment) σ generated in the base portion of the column member 10 can be obtained.

  When the bending stress is calculated in this way, the safety of the existing marker column 1 as an object is evaluated based on the bending stress σ (evaluation process). The evaluation of the existing marker column 1 can be performed by checking whether or not the bending stress σ calculated in the stress calculation step is within the allowable bending stress, but in the present embodiment, the calculated bending stress σ is used as a basis. Until the possibility of breakage of the existing sign post 1 is determined.

  Specifically, a fatigue design curve diagram (SN curve diagram) found for each joining method as shown in FIG. 10 is used to determine whether or not the existing marker column 1 is damaged. Note that the fatigue design curve shown in FIG. 10 is an example.

In the fatigue design curve diagram, the stress amplitude value S is set on the vertical axis, and the number of repetitions N is set on the horizontal axis. When the lifetime of the existing sign post 1 (cantilever-type sign post) configured as above is set to 20 years,
Number of repetitions N (the plotted value on the horizontal axis of the fatigue design curve) =
Resonance frequency (Hz) x X (times / hour) x 24 (hours) x 365 (days) x 20 (years) ... Formula (9a)
Or
Number of repetitions N = Frequency at resonance (Hz) x X (times / day) x 365 (days) x 20 (years) ... Formula (9b)
Or
Number of repetitions N = X (times / hour) x 24 (hours) x 365 (days) x 20 (years) ... Formula (9c)
Or
Number of repetitions N = X (times / day) x 365 (days) x 20 (years) ... Formula (9d)
Can be obtained from Note that X (times / time) or X (times / day) can be obtained from statistical data of vehicles entering an elevated road, a road bridge, or the like, or actually measured data of an elevated road or a road bridge. For example, by measuring acceleration data of elevated roads and road bridges, creating an acceleration range frequency distribution using a technique such as the rain flow method, and applying a linear cumulative damage law, a certain acceleration is achieved for one hour, Or the value which calculated | required how many times it generate | occur | produces per day can be employ | adopted.

  Then, the number of iterations N obtained by any one of formula (9a), formula (9b), formula (9c), and formula (9d) is plotted on the horizontal axis of the fatigue design curve diagram, and in the bending stress estimation step, When the calculated bending stress S is plotted on the vertical axis of the fatigue design curve diagram and the plotted value is located on the upper side of the fatigue design curve described in the fatigue design curve diagram, the calculated bending stress is indicated by the existing indicator column. 1 is in the destruction zone, the existing sign post 1 may be damaged (cracked, cracked, etc.) due to fatigue, and the existing sign post 1 needs to be repaired or replaced. Evaluation of the durability of the existing sign post 1 is completed. On the other hand, when it is determined that there is no risk of the sign post 1 being damaged due to fatigue, the evaluation is completed assuming that the existing sign post 1 is secured.

  As described above, in the durability evaluation method for the existing marker column 1 according to the present embodiment, the actual amplitude amount W in the horizontal direction at the upper end of the column member 10 of the existing marker column 1 is contactless in the actual amplitude amount measuring step. Since the measurement is performed, it is not necessary to approach the existing marker column 1 in order to obtain the actual data related to the existing marker column 1 in evaluating the durability of the existing marker column 1. Further, only the actual amplitude amount W of the existing marker pillar 1 is acquired without contact, and the work at the site is very simple.

  Further, in the stress calculation step of calculating the bending stress acting on the base of the existing marker column 1 from the acquired actual amplitude amount W, the column was placed in a dynamic environment in which the length ratio between the column member 10 and the arm member 11 is different. The horizontal dynamic amplitude W ′ of the upper end of each column member 10 of the plurality of standard marker columns 1 ′ and the dynamic bending stress of the base of the column member 10 are obtained, and a plurality of standards placed in a static environment are obtained. The amount of static deflection δ ′ in the horizontal direction at the upper end of each column member 10 of the marker column 1 ″ and the static bending stress at the base of the column member 10 coincide with the dynamic amplitude amount W ′ and the dynamic bending stress. As described above, a static tensile force is applied to the tip of the arm member 11 to obtain a tensile angle of the tensile force with respect to the arm member 11, and a correlation between a preset length ratio and the tensile angle (a function representing a correlation). To the strut portion of the existing marker column 1 that is the target of the actual amplitude measurement process 10 is obtained based on the length ratio between the arm member 11 and the arm member 11, and the horizontal force acting on the tip of the arm member 11 from the general deflection formula based on the tension angle θ ° and the actual amplitude W. Px and vertical force Py are calculated, and acting on the base of the column member 10 from the bending moment acting on the base of the column member 10 calculated using a general moment calculation formula based on the horizontal force Px and the vertical force Py. Since the bending stress is calculated, the bending stress actually acting on the existing marker column 1 can be easily calculated even if the data acquired at the site is only the actual amplitude amount W. Therefore, it is not necessary to perform a complicated analysis such as a finite element analysis, and even an operator who has little specialized knowledge such as an analysis can easily confirm the safety of the existing sign post 1.

  In the actual amplitude amount measuring step, since the actual amplitude amount in the horizontal direction at the upper end of the column member 10 is calculated based on a moving image or a still image obtained by photographing the existing marker column 1, data acquisition at the site is performed. In this case, it is only necessary for the worker to take a picture from a remote location without approaching the place where the existing sign post 1 is installed. Then, based on the moving image or the still image of the photographed existing marker column 1 (at least the tip of the column member 10), the horizontal amplitude (shake amount) of the upper end of the column member 10 from the actual measurement by image analysis or actual measurement on the image. ) Can be determined.

  In addition, this invention is not limited to the said embodiment, Of course, a various change can be added in the range which does not deviate from the summary of this invention.

  In the above embodiment, the safety for the existing marker column 1 is evaluated from the fatigue design curve diagram based on the bending stress σ calculated in the bending stress estimation step. For example, the bending stress calculated in the bending stress estimation step is You may make it evaluate the safety | security of the existing marker pillar 1 by seeing whether it is more than allowable bending stress. However, since judgment based only on bending stress cannot grasp the time when there is a possibility of breakage, etc., it is possible to grasp the time when there is a possibility of fatigue failure using the fatigue design curve diagram, It is preferable to set a schedule for replacement or the like.

  In the above embodiment, the actual amplitude amount W is measured in a non-contact manner with respect to the existing marker column 1 on the basis of the image photographed by the digital camera C or the like in the actual amplitude amount measurement step. However, the present invention is not limited to this. For example, you may make it measure using an amplitude measuring device. Even if it does in this way, the bending stress in the base part of the column member 10 is obtained with the measurement result (deflection) and the tensile angle θ ° by obtaining the tensile angle θ ° corresponding to the existing marker column 1 as in the above embodiment. Can be calculated. Therefore, similarly to the above-described embodiment, it is not necessary to perform specialized and advanced work such as setting dynamic conditions when calculating the bending stress. However, it is needless to say that it is preferable to measure the actual amplitude amount W in a non-contact manner as in the above-described embodiment, considering workability when measuring the actual amplitude amount W.

  In the above embodiment, the method for setting the reference function and the method (procedure) for setting the existing marker pillar 1 using the function have been described on the premise that the operator performs calculations and the like. A function that represents the correlation between the tension angle θ ° and the tension angle θ ° is set in advance, and the work flow is constructed as a program for the stress calculation process including the function and formulas such as the above-mentioned general deflection formula (deformation formula). For example, the operator simply inputs the actual amplitude amount W with respect to the existing marker column 1, the length ratio of the existing marker column 1, the outer diameter, and the like until calculation of bending stress or judgment of fatigue is performed. be able to. In addition, since complicated analysis, calculation, and the like are not performed as in finite element analysis, when programmed as described above, the load on the arithmetic processing device is small, and a series of processing can be performed in a short time. . If the image analysis for obtaining the actual amplitude amount W of the column member 10 is included in the above-mentioned program, most of the processing is processed by the arithmetic processing unit, and only the drawing of the existing marker column 1 to be processed. By simply inputting information (length ratio, outer diameter, etc.) that can be grasped in (1), the existing sign post 1 can be evaluated to the end.

The whole figure of the existing marker pillar used as the object of the endurance evaluation method concerning one embodiment of the present invention is shown. It is a conceptual diagram at the time of acquiring data in the dynamic data acquisition step in the durability evaluation method according to the embodiment, and shows a state where a dynamic (vibration) condition is given to the standard marker column. The schematic flowchart of the dynamic data acquisition process which concerns on the same embodiment is shown. It is a conceptual diagram at the time of acquiring data in the static data acquisition process in the durability evaluation method according to the embodiment, and shows a state where a static condition is given to the standard marker pillar. The schematic flowchart of the static data acquisition process and function setting process which concern on the embodiment is shown. FIG. 9 is a graph that is a basic in the stress calculation step in the durability evaluation method according to the embodiment, and is a graph that represents a function (approximate line) of a correlation between a length ratio between a support member and an arm member and a tensile angle; Show. The schematic flowchart of an actual amplitude amount measurement process and a stress calculation process according to the embodiment is shown. It is explanatory drawing for demonstrating the actual amplitude amount measurement process which concerns on the same embodiment, Comprising: The state which image | photographed the existing marker pillar is shown. It is an image of the existing marker pillar image | photographed at the actual amplitude amount measurement process which concerns on the embodiment, Comprising: The explanatory view at the time of calculating | requiring an actual amplitude amount is shown. An example of the fatigue design curve figure (SN diagram) for finding out the generation | occurrence | production time of the fatigue fracture of the existing marker pillar based on the bending stress calculated by the stress calculation process which concerns on the embodiment is shown.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Existing sign pillar, 1 '... Standard sign pillar (1st standard sign pillar), 1' '... Standard sign pillar (2nd standard sign pillar), 10 ... Strut member, 11 ... Arm member, 100 ... Vibration generator 101 ... Base, 102 ... Excitation device, G ... Strain gauge

Claims (3)

  A method for evaluating the durability of an existing sign pillar composed of a pillar member erected at a predetermined place and an arm member that extends in an orthogonal direction on the upper part of the pillar member and has a predetermined sign attached thereto, The actual amplitude measurement process for measuring the horizontal actual amplitude at the upper end of the column member of the existing sign post, the stress calculation step for calculating the bending stress generated at the base of the column member from the actual amplitude, and the calculated bending stress An evaluation step for determining whether or not the existing sign post is durable, and the stress calculation step includes a plurality of standard sign posts having different length ratios between the support member and the arm member. On the other hand, the horizontal dynamic amplitude at the upper end of the column member in a state installed in a vibration environment and the dynamic bending stress of the base of the column member are obtained, and a plurality of units in a state installed in a static environment are obtained. For each standard sign post, the upper end of the column member is horizontal Tension on the tip of the arm member and tension on the arm member in which the amount of static deflection in the direction and the static bending stress of the base of the column member match the dynamic amplitude and dynamic bending stress of the corresponding standard marker column Corresponding based on the length ratio between the strut member and the arm member of the existing marker column, which is the target of the actual amplitude amount measurement process, from the correlation between the length ratio and the tension angle set in advance by obtaining the angle Obtain the tension angle, calculate the horizontal force and the vertical force acting on the tip of the arm member from the general deflection formula based on the tension angle and the actual amplitude, and calculate the general moment formula based on the horizontal force and the vertical force. A method for evaluating the durability of an existing marker column, comprising: calculating a bending stress acting on a base of a column member from a bending moment acting on the base of the column member calculated by using the bending moment.   The durability evaluation method for an existing marker column according to claim 1, wherein the actual amplitude amount measuring step calculates an actual amplitude amount in the horizontal direction at the upper end of the column member based on a moving image or a still image obtained by photographing the existing marker column.   Criteria for evaluating the durability of an existing sign pillar composed of a pillar member erected at a predetermined place and an arm member extending in an orthogonal direction on the upper part of the pillar member and attached with a predetermined sign This is a setting method for each of a plurality of standard marker columns having different length ratios between the column member and the arm member, in the horizontal direction at the upper end of the column member in a state installed in a vibration environment. A dynamic data acquisition process for determining the dynamic amplitude and dynamic bending stress at the base of the column member, and the horizontal direction of the upper end of the column member for each of a plurality of standard marker columns installed in a static environment The tensile force against the tip of the arm member and the tensile angle with respect to the arm member where the static deflection of the arm and the static bending stress of the base of the column member coincide with the dynamic amplitude and dynamic bending stress of the corresponding standard marker column Static data acquisition process and static data acquisition process The tension angle for calculating the bending stress of the base of the column member from the actual amplitude amount of the existing marker column to be evaluated with respect to the correlation between each tensile angle obtained in step 1 and the length ratio for each standard marker column And a function setting step for setting the function as a reference function for obtaining a reference value.

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