JP5053022B2 - Reinforced concrete member design support apparatus, design support method and program - Google Patents

Description

  The present invention relates to a design support device, a design support method, and a program for a reinforced concrete member.

Conventionally, the design of reinforced concrete members has been centered on the allowable stress design method. In recent years, the “Concrete Standard Specification” published by the Japan Society of Civil Engineers has been revised, and the design of reinforced concrete members has shifted to a design form based on the principle of checking the performance of reinforced concrete structures. One of the means, the limit state design method, is intended for ordinary concrete.
On the other hand, in the field of construction, since the “Law on Promotion of Housing Quality Assurance” was enacted, interest in concrete crack control has increased, and expanded concrete aimed at suppressing cracks in concrete structures has attracted attention. ing.
Research on expansive material for concrete or expansive concrete has been conducted energetically. For example, Non-Patent Document 1 discloses a method for estimating expansion distribution in a member using expanded concrete.
In recent years, for example, reinforced concrete structures using expanded concrete, such as cast-in-place concrete, building foundations, slabs, dirt, bridge piers, wall rails, floor slabs, lining concrete, offshore structures, mass concrete, etc. Is mentioned. Further, for example, in concrete product applications, box culverts, fume pipes, working walls, U-shaped grooves and the like can be mentioned.

Yukikazu Tsuji and Mitsuhiro Maeyama, “Method for Estimating Expansion Distribution in Members Using Expanded Concrete”, Cement Technology Annual Report, 1977, XXXI, p. 231-233

However, the estimation method disclosed in Non-Patent Document 1 is theoretical, and it has been difficult to apply this estimation method to an actual cross-sectional design because of complicated calculations.
An object of this invention is to provide the design support apparatus of the reinforced concrete member which can perform the limit state design of expansion concrete easily.

  In order to achieve the above object, a design support device for a reinforced concrete member according to the present invention is received by a receiving unit that receives a setting related to a property of concrete mixed with an expansion material and a setting related to a cross section of the reinforced concrete member, and the receiving unit receives the setting. Analyzing means for dividing the member cross section with respect to a predetermined direction based on the setting and analyzing at least one of the strain distribution and the stress distribution in the cross section from the force balance condition in the cross section.

Preferably, it further has a shear strength calculation means for calculating a shear strength of the reinforced concrete member based on the analysis result by the analysis means.
Preferably, the apparatus further includes bending strength / axial strength calculation means for calculating at least one of bending strength and axial strength of the reinforced concrete member based on the analysis result by the analysis means.
Preferably, the analysis means further analyzes the cross-sectional stress degree of the reinforced concrete member.
Preferably, it further has a crack width calculating means for calculating the crack width of the reinforced concrete member based on the analysis result by the analyzing means.

  Further, the design support method for a reinforced concrete member according to the present invention receives a setting related to the characteristics of the concrete mixed with the expansion material and a setting related to the cross section of the reinforced concrete member, and the member cross section is set in a predetermined direction based on the received setting. On the other hand, at least one of the strain distribution and the stress distribution in the cross section is analyzed from the balance condition of the force in the cross section.

Preferably, the length change rate of the test member is estimated based on the analysis result.
Preferably, the mixing amount of the expansion material is calculated based on the estimated length change rate.

  Furthermore, the program according to the present invention is a reinforced concrete member design support apparatus including a computer, based on the accepting step of accepting the setting relating to the characteristics of the concrete mixed with the expansion material and the setting relating to the cross section of the reinforced concrete member, and the accepted setting. Then, the computer divides the member cross section with respect to a predetermined direction, and causes the computer to execute an analysis step of analyzing at least one of the strain distribution and the stress distribution in the cross section based on the force balance condition in the cross section.

  According to the present invention, it is possible to easily design a limit state of expanded concrete.

FIG. 1 is a diagram showing a hardware configuration of a design support device 10 for a reinforced concrete member according to an embodiment of the present invention.
As shown in FIG. 1, a design support apparatus 10 includes a CPU 12, a memory 14, a storage device 16 such as a hard disk drive, a communication device 18 that performs data communication with an external computer (not shown) via a network, a liquid crystal display, and the like. A display device 20 such as a display and an input device 22 such as a keyboard and a mouse are included. These components are connected to each other via a bus 24.

Next, an operation screen displayed on the display device 20 by the CPU 12 of the design support apparatus 10 will be described with reference to FIGS.
FIG. 2 is a diagram illustrating a main screen 100 displayed on the display device 20 of the design support apparatus 10.
As shown in FIG. 2, the main screen 100 includes a section setting button 102, a verification setting button 104, an analysis button 106, a safety review button 108, a usability review button 110, and a volume change distribution button 112. In the present embodiment, these components are realized as buttons, but any means for instructing a function to be executed may be used, and the present invention is not limited to buttons.

  Design support for reinforced concrete members consists of pre-processing, analysis and post-processing. Pre-processing includes cross-section setting processing and verification setting processing, and post-processing includes safety determination processing and usability determination processing.

  When the section setting button 102 is pressed on the main screen 100, a section setting process is executed. When the check setting button 104 is pressed, a check setting process is executed. Similarly, when the analysis button 106, the safety review button 108, and the usability review button 110 are pressed, an analysis process, a safety determination process, and a usability determination process are executed, respectively. When the volume change distribution button 112 is pressed, the distribution of the cross-sectional stress degree resulting from at least one of the expansion characteristic and contraction characteristic of the concrete is displayed.

FIG. 3 is a diagram showing a cross-section input screen 120 displayed in the cross-section setting process.
As shown in FIG. 3, the cross-section input screen 120 includes a cross-section selection unit 122, a setting content selection unit 124, a set value input unit 126, and a preview unit 128. The section input screen 120 is displayed on the display device 20 when the section setting button 102 is pressed on the main screen 100.

  The section selection unit 122 is a selection unit for selecting a section to be set, and is realized by a button, for example. In this embodiment, the cross section selection unit 122 selects cross sections 1 to 5. Therefore, the design support apparatus 10 according to the present embodiment can simultaneously determine the set five cross sections.

  The setting content selection unit 124 is a means for selecting any one of the cross-sectional shape, main bar, concrete, expansion material, shear reinforcement bar, and material coefficient, and is realized by a tab, for example. The setting value input unit 126 is a means for inputting a setting value related to the item selected by the setting content selection unit 124. For example, when “main bar” is selected in the setting content selection unit 124, setting values relating to the reinforcing bar 1 and the reinforcing bar 2 can be input. The preview unit 128 schematically displays a cross section reflecting the set value input in the set value input unit 126.

  Note that the number of selectable cross sections, the number of rebars that can be set, and setting items are not limited to this example. Further, the screen configuration is not limited to this example.

FIG. 4 is a diagram showing a cross-section input screen 120 displayed in the cross-section setting process when the expansion material tab is selected.
As shown in FIG. 4, when the expansion material tab is selected in the setting content selection unit 124 of the cross-section input screen 120, settings related to the expansion material, more specifically, settings related to the properties of the concrete mixed with the expansion material are input. It becomes possible. In the present embodiment, a reference value of expansion strain (value of JIS A6202 A method or B method) is input. This value is the length change rate ε _s of the restraining steel material of the test member described later. Moreover, the value input is not limited to this example, For example, the value obtained based on JIS data may be sufficient.

FIG. 5 is a diagram showing a check condition setting screen 130 displayed in the check setting process.
As shown in FIG. 5, the check condition setting screen 130 includes an ultimate limit condition input unit 132 and a use limit condition input unit 134. The check condition setting screen 130 is displayed on the display device 20 when the check setting button 104 is pressed on the main screen 100.

  The ultimate limit condition input unit 132 is a means for inputting a design cross-sectional force such as a design bending moment, a design axial force, and a design shear force in the ultimate limit state. The use limit condition input unit 134 is a means for inputting the design sectional force at the use limit. The checking condition is input through such an input means.

  For example, 5 cases can be input as the checking condition. Therefore, the design support apparatus 10 according to the present embodiment can simultaneously check 25 patterns by combining with the five cross sections input on the cross section input screen 120. In addition, each design cross-sectional force input by the verification conditions is not limited to each limit state.

FIG. 6 is a strain distribution display screen 140 which is analyzed on the cross-section input screen 120 in which settings related to the properties of the concrete mixed with the expansion material and settings related to the cross-section of the reinforced concrete member are input.
The distribution display screen 140 is displayed on the display device 20 when the volume change distribution button 112 is pressed on the main screen 100 after the analysis process is executed. As shown in FIG. 6, on the distribution display screen 140, the examination cross section selection unit 142, the calculation result display unit 144, the stress distribution display unit 146 that displays the stress distribution based on the concrete characteristics, and the strain distribution based on the concrete characteristics are displayed. A strain distribution display unit 148 to be displayed is included.

  Examples of the properties of concrete include expansion strain due to expanded concrete and self-shrinkage strain. The expansion strain varies depending on, for example, conditions such as the type of expansion material, the mixing amount, the concrete composition, and the curing. In addition, the said conditions are not limited to these, For example, the value measured according to JISA6202 may be used. In addition, the stress introduced by the properties of the concrete becomes “chemical prestress” in the case of expanded concrete, and the strain introduced by the properties of the concrete becomes “chemical press train”.

  The examination section selection unit 142 is a selection unit for selecting one of the sections set on the section input screen 120. When a cross section is selected by the examination cross section selection unit 142, calculation results and the like regarding this cross section are displayed on the calculation result display unit 144, the stress distribution display unit 146 and the strain distribution display unit 148. The analysis method will be described later in detail.

FIG. 7 is a diagram showing an examination result screen 150 displayed in the safety determination process.
As shown in FIG. 7, the examination result screen 150 includes a condition selection unit 152 and a result display unit 154. The examination result screen 150 is displayed on the display device 20 when the safety examination button 108 is pressed on the main screen 100 after the analysis processing is executed.

  The condition selection unit 152 is a selection unit for selecting a case set on the cross-section and verification condition setting screen input on the cross-section input screen 120. The result display unit 154 displays a calculation result and a safety determination result under the condition selected by the condition selection unit 152.

  In addition, in the examination result screen 150 shown in FIG. 7, the result regarding the case of receiving the bending moment and the axial force is displayed, but the calculation result regarding the shearing force and the determination result of the safety are also displayed in the same manner. The In addition, calculation results and determination results (for example, crack width and deformation amount) related to usability are displayed when the usability review button 110 is pressed on the main screen 100.

Next, a design support method for the reinforced concrete member and a program for realizing screen transition will be described.
FIG. 8 is a diagram showing a functional configuration of a cross-section design support program 200 that operates on the design support apparatus 10 according to the embodiment of the present invention. Hereinafter, the cross-section design support program 200 is also simply referred to as a design support program 200.
As shown in FIG. 8, the design support program 200 includes a control unit 202, a display unit 204, an input reception unit 206, an analysis unit 208, a result storage unit 210, a bending strength / axial strength calculation unit 212, and a shear strength calculation unit 214. And a crack width calculation unit 216. The design support program 200 is loaded into the memory 14 of the design support apparatus 10 and executed by the CPU 12.

  In the design support program 200, the control unit 202 controls other components. The control unit 202 inputs and outputs data with other components. The display unit 204 receives screen data from the control unit 202 and displays the screens shown in FIGS. 2 to 7 on the display device 20.

  The input receiving unit 206 receives settings input via the input device 22 and outputs them to the control unit 202. More specifically, the input receiving unit 206 receives settings related to the characteristics of the concrete mixed with the expansion material and settings related to the cross section of the reinforced concrete member via the cross section input screen 120 and the check condition setting screen 130.

  Based on the setting received by the input receiving unit 206, the analysis unit 208 analyzes at least one of the strain distribution and the stress distribution in the cross section from the force balance condition in the cross section. The analysis unit 208 further analyzes the cross-sectional stress degree of the reinforced concrete member.

  The result storage unit 210 stores a calculation result by a bending strength / axial strength calculation unit 212, a shear strength calculation unit 214, and a crack width calculation unit 216, which will be described later, and an analysis result by the analysis unit 208. These analysis results and the like are written and read by the control unit 202. The result storage unit 210 is realized by at least one of the memory 14 and the storage device 16.

  The bending strength / axial strength calculation unit 212 calculates at least one of the bending strength and axial strength of the member based on the analysis result by the analysis unit 208, and determines safety based on the calculation result. The shear strength calculation unit 214 calculates the shear strength of the member based on the analysis result by the analysis unit 208, and determines safety based on the calculation result. The crack width calculation unit 216 calculates a crack width based on the analysis result by the analysis unit 208 and determines usability based on the calculation result.

  The design support program 200 accepts the setting related to the characteristics of the concrete mixed with the expansion material and the setting related to the cross section of the reinforced concrete member by such components, and based on the received setting, the member cross section is set to a predetermined direction. And analyzing at least one of the strain distribution and stress distribution of the cross section from the balance condition of the force in the cross section. Further, the design support program 200 calculates the cross-sectional strength (bending strength, axial strength and shear strength), cross-sectional stress, crack width, and deformation amount based on the analysis result.

  Next, the analysis method of the stress distribution and strain distribution of the cross section resulting from the characteristics of the concrete by the analysis unit 208 of the design support program 200 will be described in detail. In the following description, expanded concrete is targeted for simplification. Moreover, the characteristics of concrete are not limited to the expansion of expanded concrete.

When the expansion of the expanded concrete is restrained by a restraint such as a reinforcing bar, compressive stress is introduced into the concrete and tensile stress is introduced into the restraint. In self-shrinking or the like, tensile stress is introduced into the concrete and compressive stress is introduced into the restraint.
In the case of expanded concrete, the chemical prestress introduced into the concrete is expressed by the following equation from the balance condition between the force of the concrete and the reinforcing bar.

Here, σ _c is a chemical prestress (N / mm ² ), p is a restrained steel ratio, E _s is an elastic coefficient (N / mm ² ) of the restrained steel, and ε _s is a length change rate of the restrained steel.

FIG. 9 is a diagram illustrating the relationship between the unit amount of the expanded material and the length change rate measured by the JIS A 6202 B method. In FIG. 9, the expansion material A is a lime-ettringite composite expansion material, and the expansion material B is an ettringite expansion material.
As illustrated in FIG. 9, the length change rate increases as the unit amount of the expanding material increases. Such a rate of change in length ε _s is input as a setting relating to the expansion material on the cross-section input screen 120 shown in FIG. 4.

  For this reason, it can be determined whether the input length change rate is appropriate based on the analysis result. Therefore, based on the analysis result, the user estimates the rate of change of the length of the test specimen (test member) such as JIS A 6202 B method, and expands based on the estimated rate of change of length. The amount of material mixed can be calculated.

  The analysis unit 208 estimates the internal strain distribution based on the constant work amount law. The constant work amount rule is that “the amount of work that the expanded concrete does to restraint is constant regardless of the degree of restraint”, and is expressed by the following equation.

Here, U shows the work amount (N / mm ² ) that the expanded concrete does with respect to the restrained steel material.

FIG. 10 is a diagram for explaining a method for estimating chemical prestress introduced into a reinforced concrete member when the reinforcing bars are arranged asymmetrically in the height direction with respect to the cross section, based on the work constant law. 10 (A) shows a cross section, FIG. 10 (B) shows the distribution of the chemical press train, and FIG. 10 (C) shows the distribution of chemical prestress and the stress distribution of the steel material.
10 (A) and 10 (B), the expansion strain εx at the position of the distance x from the lower edge of the expanded concrete member is expressed by the following equation.

Here, h is the height (m) of the cross section, ε _b is the expansion strain of the lower edge, and ε _u is the expansion strain of the upper edge. The basic equation for obtaining the distribution of the chemical press train is obtained by substituting the expansion strain obtained in Equation (3) into Equation (2).

  Further, as shown in FIG. 10C, equation (4) is established from the balance between the tensile force of the reinforcing bar and the compression force of the expanded concrete, and equation (5) is established from the balance of the moment of the lower edge. To do.

Here, b is the width (m), A _si member cross-section, rebar amount rebar i ^(m 2), E _s denotes an elastic coefficient of the rebar (N / ^{m 2).} The chemical prestress and the chemical press train are calculated by obtaining ε _b and ε _u that satisfy the equations (4) and (5) assuming ε _b and ε _u in the equation (3). In addition, in the cross section other than the rectangle, the width b of the expressions (4) and (5) may be corrected.

FIG. 11 is a flowchart showing internal strain analysis processing by the analysis unit 208.
As shown in FIG. 11, in step 100 (S100), the analysis unit 208 assumes ε _b and ε _u .
In step 102 (S102), the analysis unit 208 calculates the distribution of expansion strain based on the equation (3).

In step 104 (S104), the analysis unit 208 calculates the total expansion force (A) of the concrete based on the first term on the left side of Equation (4), and the reinforcing bar based on the second term on the left side of Equation (4). The total tensile force (B) is calculated.
In step 106 (S106), the analysis unit 208 calculates the moment (C) at the lower edge of (A) based on the first term on the left side of equation (5), and based on the second term on the left side of equation (5). (B) to calculate the moment (D) at the lower edge.

  In step 108 (S108), the analysis unit 208 determines whether (A)-(B) is smaller than a predetermined allowable error and whether (C)-(D) is smaller than a similar allowable error. judge. The analysis unit 208 proceeds to the process of S110 when (A)-(B) is smaller than the allowable error and (C)-(D) is smaller than the allowable error, and returns to S100 otherwise.

In step 110 (S110), the analysis unit 208 employs ε _b and ε _u assumed in the processing of S100.
In this way, ε _b and ε _u are determined, and an internal strain distribution is obtained.

Next, a stacked model used by the design support apparatus 10 according to the embodiment of the present invention will be described.
The design support apparatus 10 according to the embodiment of the present invention uses a laminated model divided into minute elements with respect to the height direction of the cross section of the target reinforced concrete member, and determines the cross sectional strength and One of the cross-sectional stresses is calculated.

FIG. 12 is a diagram showing the concept of the stacked model used by the design support apparatus 10 according to the embodiment of the present invention.
As shown in FIGS. 12A to 12C, the lamination model is a model in which a member cross section is divided into finite microelements and a cross-sectional design is performed from the balance of the forces of the microelements.

  In the laminated model, when the bending moment is taken into consideration, the equation (6) is established from the balance condition of the force acting on the cross section, and the equation (7) is established from the balance condition of the moment.

Here, C ′ _c is the compressive force (N) of concrete, C ′ _s is the compressive force (N) of the compressive rebar, T _c is the tensile force (N) of concrete, and T _s is the tensile force of the tensile rebar. (N), M is the bending moment (Nm), d is the effective height of the tensile reinforcement (m), y _c is the distance (m) from the compression edge of the member to the applied position of the compression force of the concrete, d 'is the effective height of the compression rebar (m), y _t is the distance from the compression edges of the member to the operative position of the concrete tensile force (m), x indicates the position of the neutral axis (m).

  The design support apparatus 10 according to the embodiment of the present invention calculates the cross-sectional strength or the cross-sectional stress degree in an arbitrary stress state by setting the strain of the concrete compression edge based on the formulas (6) and (7). To do. More specifically, the design support device 10 calculates the cross-sectional yield strength when the ultimate strain of concrete is set as the strain of the compression edge of the concrete, and the cross-section when the strain smaller than the ultimate strain of concrete is set. Calculate the degree of stress.

  Further, when the bending moment and the axial force are simultaneously received, the equation (8) is established from the balance condition of the force acting on the cross section, and the equation (9) is established from the moment balance condition.

Here, N is the axial force (N), e is the amount of eccentricity (m), and y ₀ is the centroid height (m) of the cross section.

  FIG. 13 shows a stress strain model of a member applied to the lamination model in the embodiment of the present invention, FIG. 13A shows a stress strain model of concrete, and FIG. 13B shows a stress strain model of rebar. Show. In addition, the relationship between the stress and strain of the member applied to the lamination model in the embodiment of the present invention may be expressed by one or more mathematical formulas, and is limited to the stress strain model shown in FIG. is not.

  In the expanded concrete, before the external force is applied, the chemical prestress of the concrete and the stress corresponding to the chemical press train of the steel material are in balance. Therefore, in the stress-strain model shown in FIG. 13, the expanded concrete is balanced with the origin of the stress-strain model of ordinary concrete being moved. The design support apparatus 10 according to the embodiment of the present invention calculates the cross-sectional yield strength or the cross-sectional stress degree in the expanded concrete by giving such a balance condition as an initial condition.

Next, a bending strength calculation method by the bending strength / axial strength calculation unit 212 of the design support program 200, a shear strength calculation method by the shear strength calculation unit 214, and a crack width calculation method by the crack width calculation unit 216 will be described.
The bending strength / axial strength calculation section 212 of the design support program 200 calculates the cross-sectional strength with the concrete compression edge strain as the concrete ultimate strain. When a strain smaller than the ultimate strain of concrete is set, the bending strength / axial strength calculation unit 212 calculates the cross-sectional stress.

  The shear strength calculation unit 214 calculates a decompression moment, which will be described later, from the internal strain or internal stress analyzed by the analysis unit 208. Similarly, in the case of expanded concrete, the shear strength calculation unit 214 calculates the chemical prestress calculated by the analysis unit 208 by considering it as a decompression moment. The shear strength calculation unit 214 calculates, for example, using the following formula described in the Japan Society of Civil Engineers Concrete Standard Specification.

Here, V _yd is the shear strength of the reinforced concrete member, V _cd is the shear strength of the concrete takes charge, V _sd is the shear strength of shear reinforcement is responsible, A _s is the cross-sectional area of the tension-side steel (mm ^2), b _w is the width of the abdomen (mm), A _w is the cross-sectional area (mm ² ) of the shear reinforcement at the arrangement interval s _s of the shear reinforcement, M ₀ is the axis at the tensile edge with respect to the design bending moment M _d Bending moment (decompression moment) necessary to cancel the stress generated by the directional force N _d , f _wyd is the design yield strength (N / mm ² ) of the shear reinforcement, α _s is the axis of the shear reinforcement The angle Z, which is the fold angle, indicates the distance (mm) from the position where the resultant compressive stress acts to the centroid of the tensile steel material.

FIG. 14 is a diagram for explaining the decompression moment.
As shown in FIG. 14, in the case of an expanded concrete member, chemical prestress is added to the compressive stress due to the design axial force, so the decompression moment M ₀ is larger than that of the reinforced concrete member. Therefore, by considering chemical prestress in the axial direction of the member, the decompression moment increases and the shear strength of the member increases.

  The crack width calculation unit 216 calculates the crack width using the following equation.

Here, w is the crack width (mm), k ₁ is a coefficient representing the influence of the surface shape of the steel material on the crack width, k ₂ is a coefficient representing the influence of the quality of the concrete on the crack width, and k ₃ is , A coefficient representing the number of steps of the tensile steel material, c is a cover (mm), c _s is a center interval (mm) of the steel material, φ is a steel material diameter (mm), ε ′ _csd is due to shrinkage and creep of concrete, etc. The numerical value σ _se for taking into account the increase in crack width indicates the amount of increase in the reinforcing bar stress level (N / mm ² ) from the state where the stress level of the concrete at the steel material position is zero.

Next, the overall operation of the design support apparatus 10 according to the embodiment of the present invention will be described.
FIG. 15 is a flowchart showing the overall operation (S20) of the design support apparatus 10 according to the embodiment of the present invention.
As shown in FIG. 15, in step 200 (S200), the design support apparatus 10 displays the main screen 100 on the display apparatus 20. When the user presses the cross-section setting button 102 using the input device 22, the design support apparatus 10 displays a cross-section input screen 120 and accepts settings related to the characteristics of the concrete mixed with the expansion material and settings related to the cross-section of the reinforced concrete. When the user presses the check setting button 104, the design support apparatus 10 displays the check condition setting screen 130 and accepts the check condition.

  Thereafter, when the analysis button 106 on the main screen 100 is pressed by the user, the design support apparatus 10 executes an analysis process (S10) of the internal strain distribution of the expanded concrete.

  After the analysis processing, when the user presses the safety review button 108 on the main screen 100 in step 202 (S202), the design support apparatus 10 calculates the bending strength and the axial strength, and the calculation result and the determination result. The examination result screen 150 including is displayed.

In step 204 (S204), the design support apparatus 10 calculates the shear strength and displays an examination result screen (not shown) including the calculation result and the determination result on the display device 20.
Further, in step 206 (S206), when the user depresses the usability review button 110 on the main screen 100, the design support apparatus 10 calculates the crack width, and the study result screen (including the calculation result and the determination result) ( (Not shown) is displayed on the display device 20.
Note that the order of the processes of S202 to S206 is not limited to this example, and any order may be used. Further, the examination result screen regarding the shear strength and the crack width includes substantially the same content as the examination result screen regarding the bending strength and the axial strength.

It is a figure which shows the hardware constitutions of the design support apparatus 10 of the reinforced concrete member which concerns on embodiment of this invention. 4 is a diagram showing a main screen 100 displayed on the display device 20 of the design support apparatus 10. FIG. It is a figure which shows the cross-section input screen 120 displayed in a cross-section setting process. It is a figure which shows the cross-section input screen 120 displayed in the cross-section setting process when an expansion material tab is selected. It is a figure which shows the setting screen 130 of the verification conditions displayed in a verification setting process. On the cross-section input screen 120, settings relating to the properties of the concrete mixed with the expansion material and settings relating to the cross-section of the reinforced concrete member are input, and the strain distribution display screen 140 is analyzed. It is a figure which shows the examination result screen 150 displayed in the determination process of safety. It is a figure which shows the function structure of the cross-section design support program 200 which operate | moves on the design support apparatus 10 which concerns on embodiment of this invention. It is a figure which illustrates the relationship between the unit amount of an expandable material measured by JISA6202B method, and length change rate. It is a figure explaining the estimation method of the chemical prestress introduced into the reinforced concrete member in the case where the reinforcing bars are arranged asymmetrically in the height direction with respect to the cross section based on the constant work amount. Shows a cross section, FIG. 10 (B) shows the distribution of the chemical press train, and FIG. 10 (C) shows the distribution of the chemical prestress and the stress distribution of the steel material. 5 is a flowchart showing internal strain analysis processing by an analysis unit 208; It is a figure which shows the concept of the lamination | stacking model used by the design support apparatus 10 which concerns on embodiment of this invention. FIG. 13A shows a stress strain model of a concrete applied to the lamination model in the embodiment of the present invention, FIG. 13B shows a stress strain model of concrete, and FIG. It is a figure explaining a decompression moment. It is a flowchart which shows the whole operation | movement (S20) of the design support apparatus 10 which concerns on embodiment of this invention.

Explanation of symbols

10 Design support device 12 CPU
14 memory 16 storage device 18 communication device 20 display device 22 input device 200 cross-section design support program 202 control unit 204 display unit 206 input reception unit 208 analysis unit 210 result storage unit 212 bending strength calculation unit 214 shear strength calculation unit 216 crack width calculation Part

Claims (9)

Settings related to the characteristics of concrete mixed with expansive material, including at least the expansive strain value corresponding to the type and admixture of the expansive material, including the expansive strain value indicating the rate of change in the length of the restraint, and the setting of the reinforced concrete member A receiving means for receiving settings relating to the cross section;
Based on the set expansion strain value received by the receiving means, the member cross section is divided in a predetermined direction, and the strain in the cross section is determined from the balance between the expansion force of the concrete in the cross section and the tensile force of the restraint. distribution and analyzing at least one of stress distribution, based on the analysis result, the design support apparatus of the reinforced concrete member with analysis means for the expansion strain values to determine whether it is appropriate. The design support device for a reinforced concrete member according to claim 1, further comprising a shear strength calculation unit that calculates a shear strength of the reinforced concrete member based on an analysis result by the analysis unit. The design support for a reinforced concrete member according to claim 1 or 2, further comprising a bending strength / axial strength calculation means for calculating at least one of a bending strength and an axial strength of the reinforced concrete member based on an analysis result by the analysis means. apparatus. The design support device for a reinforced concrete member according to any one of claims 1 to 3, wherein the analysis unit further analyzes a cross-sectional stress degree of the reinforced concrete member. The design support device for a reinforced concrete member according to claim 4, further comprising a crack width calculation unit that calculates a crack width of the reinforced concrete member based on an analysis result by the analysis unit. Settings related to the characteristics of concrete mixed with expansive material, including at least the expansive strain value corresponding to the type and admixture of the expansive material, including the expansive strain value indicating the rate of change in the length of the restraint, and the setting of the reinforced concrete member Accepts settings related to the section,
Based on the accepted set expansion strain value , the member cross section is divided in a predetermined direction, and the strain distribution and stress in the cross section are determined from the balance between the expansion force of the concrete in the cross section and the tensile force of the restraint. analyzing at least one of the distribution, based on the analysis result, the design support method reinforced concrete member in which the expansion strain values to determine whether it is appropriate. The design support method for a reinforced concrete member according to claim 6, wherein the rate of change in length of the test member is estimated based on the analysis result. The design support method for a reinforced concrete member according to claim 7, wherein a mixing amount of the expansion material is calculated based on the estimated length change rate. In a design support device for a reinforced concrete member including a computer,
Settings related to the characteristics of concrete mixed with expansive material, including at least the expansive strain value corresponding to the type and admixture of the expansive material, including the expansive strain value indicating the rate of change in the length of the restraint, and the setting of the reinforced concrete member An accepting step for accepting settings relating to the cross section;
Based on the accepted set expansion strain value , the member cross section is divided in a predetermined direction, and the strain distribution and stress in the cross section are determined from the balance between the expansion force of the concrete in the cross section and the tensile force of the restraint. analyzing at least one of the distribution, based on the analysis result, the program for executing the analysis step of the expansion strain values to determine whether it is appropriate to the computer.

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