JP2010079321A - Method and system for design support for reinforcement of steel beam through-hole - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To properly and quickly obtain an installable range of a through-hole and ring-shaped hardware for reinforcing the through-hole. <P>SOLUTION: A through-hole design support system 1 of a steel beam is used in reinforcing a through-hole formed in the web of a steel beam by using ring-shaped hardware, and includes: an input part 2 for inputting the type of a steel beam, span length, and long-term loading conditions as an input value; an arithmetic part 3 for calculating a stress generated in a steel beam to the input value in a status which is before the through-hole is formed as an estimated stress, for comparing the estimated stress with a proof stress being in a status in which the ring-shaped hardware is reinforced to the through-hole after the through-hole is formed, and for calculating a region where the estimated stress does not exceed the proof stress; and an output part 4 for outputting the region where the estimated stress does not exceed the proof stress and the specifications of the ring-shaped hardware corresponding to the diameter of the through-hole as the possible range for the formation of the through-hole. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a reinforcing design support method and system for a steel beam through-hole used when a through-hole formed in a steel beam web is reinforced with a ring-shaped hardware.

  When placing various pipes in the steel structure under the floor or ceiling, if the pipe is placed between the steel beam and the floor or ceiling, interference between the pipe and the steel beam can be prevented. The height of the floor will increase, greatly affecting the cost of the entire building.

  For this reason, there are many cases where a through hole is formed in the steel beam and the pipe is passed through the through hole to prevent interference between the steel beam and the pipe. There is.

  Therefore, in the past, by avoiding the beam end where large stress occurs and forming a through hole at a position where the stress away from it by a predetermined distance is small, the strength of the steel beam due to the through hole is reduced. I tried not to affect my performance.

  On the other hand, with such a countermeasure, the route for arranging the piping is restricted by the position of the through hole, and therefore there is a limit to efficiently performing the piping work.

  In order to eliminate such restrictions, a method of reinforcing a through hole by attaching a reinforcing metal such as a ring shape to the through hole has come to be adopted.

Japanese Patent Laid-Open No. 2005-105675 JP 2007-164322 A JP 2007-172099 A “Steel beam through-hole reinforcement method OS ring”, Okabe Corporation, Internet <URL: http: //www.okabe.co.jp/os_ring/download.html>, [Search August 18, 2008]

  In order to reinforce the through-hole formed in the steel beam web using the ring-shaped hardware, a ring-shaped hardware having a size corresponding to the diameter of the through-hole is prepared, and is attached along the opening edge of the through-hole. It is fixed by welding.

  Here, in determining whether the decrease in the yield strength of the steel beam due to the formation of the through-hole is appropriately reinforced with the ring-shaped hardware, the yield strength of the through-hole portion is determined for each standard of the ring-shaped hardware depending on the type of the steel beam. In addition, the assumed stress when there is no through hole must be calculated by structural calculation for each span length of the steel beam and long-term load conditions, and it should be confirmed that the assumed stress does not exceed the proof stress.

  However, there are a huge number of combinations of steel beam types, span lengths, long-term load conditions and through-hole diameters, or ring-shaped hardware standards according to the diameters. Even if it is left, the problem of comparing the assumed stress and the proof stress is extremely complicated.

  In addition, although a system for supporting the above-described comparison work has been constructed, the input work is still complicated and improved, such as the diameter of the through hole or the specification of the ring-shaped hardware corresponding to the diameter must be entered. There was room for.

  Furthermore, since the diameter, position, and number of through-holes, which are the input conditions for this system, are examined at the time of facility planning, the structural design must be studied from the beginning each time various conditions for these through-holes are changed or added. I had to fix it and it was very time consuming.

  The present invention has been made in consideration of the above-described circumstances, and provides a reinforcing design support method and system for a steel beam through-hole capable of appropriately and quickly grasping a through-hole and a settable range of a ring-shaped hardware that reinforces the through-hole. The purpose is to provide.

  In order to achieve the above object, the steel beam through hole reinforcement design supporting method according to the present invention provides a method for reinforcing a through hole formed in a steel beam web using a ring-shaped hardware as described in claim 1. A steel beam through-hole reinforcement design support method used for

  Enter the steel beam type and span length and long-term load conditions as input values,

  The stress generated in the steel beam with respect to the input value is calculated in a state before the through-hole is formed, and assumed stress,

  The assumed stress is compared with the proof stress after the through-hole is formed and the ring-shaped hardware is reinforced in the through-hole,

  A region where the assumed stress does not exceed the proof stress is output as a through-hole formable range together with the diameter of the through-hole or a ring-shaped hardware standard corresponding to the diameter of the through-hole.

  The steel beam through-hole reinforcement design support method according to the present invention outputs the region as the distance from the end of the steel beam, or the distance from the end of the steel beam and the allowable eccentricity with respect to the steel beam. It is.

  Further, the steel beam through hole reinforcement design support system according to the present invention is a steel beam used for reinforcing a through hole formed in a steel beam web with a ring-shaped hardware. In the reinforcement design support system for through-holes,

  An input unit for inputting the steel beam type and span length and long-term load conditions as input values;

  The stress generated in the steel beam with respect to the input value is calculated in a state before the through-hole is formed and is assumed stress, and the assumed stress is after the through-hole is formed. A calculation unit for comparing with the proof stress of the ring-shaped hardware reinforced in the through hole;

  An output portion that outputs a region in which the assumed stress does not exceed the proof stress and outputs the through hole as well as the diameter of the through hole or a ring-shaped hardware corresponding to the diameter of the through hole.

  In the reinforcing design support system for a steel beam through-hole according to the present invention, the region is output as a distance from the end of the steel beam, or a distance from the end of the steel beam and an allowable eccentricity with respect to the steel beam. Thus, the output unit is configured.

  In order to design reinforcement of a through hole using a ring-shaped hardware by the reinforcing design support system for a steel beam through hole according to the present invention, first, the type and span length of a steel beam and a long-term load condition are input as input values.

  This input process is performed via an input unit such as a keyboard and a mouse, but the type of steel beam is stored in advance in a storage device such as a hard disk, and these are output to an output unit such as a monitor. It is desirable to be able to select appropriately at the input section. The input data is appropriately stored in a storage device such as a memory or a hard disk.

  Next, the stress generated in the steel beam with respect to the input value is calculated by the calculation unit in a state before the through hole is formed, and is assumed as the assumed stress. Here, the assumed stress refers to the stress obtained by the long-term, short-term, and final design before the through-hole is formed, that is, without the through-hole.

  Next, simultaneously with or before or after the assumed stress calculation step, the proof stress is evaluated after the through hole is formed and the ring-shaped hardware is reinforced in the through hole, and the proof stress data is stored in the storage device. To accumulate.

  Next, the assumed stress and the proof stress are compared in the calculation unit.

  Next, an area where the assumed stress does not exceed the proof stress is output as a through hole forming range together with the diameter of the through hole or a ring-shaped hardware standard corresponding to the diameter of the through hole via an output unit such as a monitor. .

  In this way, it is possible to grasp at a glance which standard ring-shaped hardware can be used to provide the through-hole at which part of the steel beam.

  As long as the assumed stress does not exceed the yield strength, the output form is arbitrary as long as it can be grasped as the range where the through hole can be formed.For example, the distance from the end of the steel beam, or the distance from the end of the steel beam and It can be output as an allowable eccentricity for the steel beam.

  DESCRIPTION OF EMBODIMENTS Embodiments of a steel beam through-hole reinforcement design support method and system according to the present invention will be described below with reference to the accompanying drawings. Note that components that are substantially the same as those of the prior art are assigned the same reference numerals, and descriptions thereof are omitted.

  FIG. 1 is a block diagram showing a reinforcing design support system for a steel beam through hole according to the present embodiment. As can be seen from the figure, the steel beam through hole reinforcement design support system 1 according to the present embodiment is used to reinforce a through hole formed in a steel beam web using a ring-shaped hardware. , The input part 2 that inputs the steel beam type and span length and long-term load conditions as input values, and the stress that occurs in the steel beam with respect to the input values calculated in the state before the through hole is formed And a calculation unit that calculates a region in which the assumed stress does not exceed the proof stress compared to the proof stress after the through-hole is formed and the ring-shaped hardware is reinforced in the through-hole. 3 and an output unit 4 that outputs a region where the assumed stress does not exceed the proof stress as a range in which the through hole can be formed, together with the standard of the ring-shaped hardware corresponding to the diameter of the through hole.

  The input unit 2 may be configured with a keyboard, a mouse, or the like. Further, the calculation unit 3 can be constituted by, for example, a personal computer main body, and the output unit 4 can be constituted by a monitor connected to the personal computer main body.

  The output unit 4 outputs a region where the assumed stress does not exceed the proof stress as a distance from the end of the steel beam and an allowable eccentricity with respect to the steel beam.

  FIG. 2 is a flowchart showing a procedure for implementing the steel beam through-hole reinforcement design support system 1 according to the present embodiment. As can be seen in the figure, in order to design reinforcement of a through hole using a ring-shaped hardware by the steel beam through hole reinforcement design support system 1, first, the type and span length of the steel beam and the long-term load condition are described later. (Steps 101a and 101b).

  This input process is performed via a keyboard, mouse, or the like that constitutes the input unit 2. The types of steel beams are stored in advance in a storage device such as a hard disk and displayed on a monitor that is the output unit 4. In addition, it is desirable to be able to select appropriately on the monitor. The input data is appropriately stored in a memory, hard disk or the like.

  FIG. 3 shows a state in which the input value and the range in which the through hole can be formed are output and displayed on the monitor that constitutes the output unit 4.

  As can be seen in the figure, the left side of the monitor is an area 31 for displaying input items mainly. In the area 32 for inputting beam information, the beam is shown in FIG. 4 (a). A field 33 for inputting the name of the beam, a field 34 for inputting the position, a field 35 for inputting the F value of the beam steel material, and a field 36 for inputting the type and size of the beam.

  To input the steel beam type and span length and long-term load conditions as input values, as shown in Fig. 4 (a), first enter bibliographic items about the beam, such as beam name and beam position, and beam steel materials. The F value, the beam type, and the beam size are input to each field of the area 32 (step 101a).

  Here, in the field 36, when the beam is a JIS series or a constant outer size, a beam series is selected and input, and then the beam size is selected and input.

  On the other hand, of the area 31 shown in FIG. 3, an area 38 for inputting information for assuming a load condition is a field 39 for inputting the internal span length of the beam, as shown in FIG. A field 40 for inputting the type of the load, a field 41 for inputting a check when the long-term load is directly input, and a field 42 for selecting and inputting the long-term load assumption condition when the long-term load is not directly input. In this field, the internal span length of the beam, the type of the beam, a check when the long-term load is directly input, and an assumption condition of the long-term load when the long-term load is not directly input are input (step 101b).

  Here, as for the ring-shaped hardware corresponding to the diameter of the through-hole, as described later, since the formable range of the through-hole is output for each standard, information on the ring-shaped hardware corresponding to the diameter of the through-hole is output. No input is required.

  Next, with respect to the input value described above, the stress generated in the steel beam is calculated by the calculation unit 3 in a state before the through hole is formed, and this is assumed as the assumed stress (step 102). Here, the assumed stress refers to the stress obtained by the long-term, short-term, and final design before the through-hole is formed, that is, without the through-hole. The assumed stress may be appropriately calculated from the input values described above according to a known structure calculation method.

  Next, the calculated assumed stress is compared with the proof stress evaluated in advance, and a region where the assumed stress does not exceed the proof strength is calculated by the calculation unit 3 (step 103).

  The proof stress is after the through-hole is formed and the ring-shaped hardware is reinforced in the through-hole, and is appropriately evaluated using a known method including a concept based on the allowable stress design. be able to.

  In order to obtain the yield strength, for example, the following four stress states, that is,

  (a) Steel beam flange, web (excluding defects due to through-holes) and ring-shaped hardware bearing the bending moment (pure bending),

  (b) The case where the flange of the steel beam and the ring-shaped hardware bear the bending moment, and the web (excluding the defective part due to the through hole) bears the shearing force,

  (c) The case where the flange of the steel beam bears the bending moment, and the ring-shaped hardware and web (excluding the defective part due to the through hole) bear the shearing force, and

  (d) A case (pure shear) where the ring-shaped hardware and web (excluding the defective portion due to the through hole) bear the shearing force,

, And the yield strength in each case is evaluated by the bending moment and shear force.

  Next, in cases other than the four cases, these bending moments and shearing forces are assumed to change linearly, and an MQ correlation curve is created. The MQ correlation curve created in this way is shown in FIG. Here, the curve 61a is a long term, 61b is a short term, and 61c is an MQ correlation curve at the end.

  In order to compare the assumed stress with the yield strength and evaluate whether the assumed stress exceeds the yield strength, the assumed stress calculated in step 102 is plotted on the same coordinates as the MQ correlation curve, and the plot position is What is necessary is just to judge by whether it is inside the MQ correlation curve.

  In FIG. 5, in combination with the curves 61a, 61b and 61c, as an example, when a force is applied from an arbitrary direction, an assumed stress continuously calculated from one beam end to the other beam end is shown. Shown as curve 62. For the sake of convenience, the assumed stress is shown as a curve 62 only at the final time.

  The curve 62 extends from the point A corresponding to the left end of the steel beam to the point E corresponding to the right end of the steel beam through points B, C, and D. Compared with the Q correlation curve 61c, the point A first enters a region surrounded by the curve 61c, though slightly, crosses the curve 61c at the point B, and once goes out of the curve 61c, then rises. In turn, it intersects with the curve 61c again at the point C, and at the point D, it intersects with the curve 61c again and goes outside the curve 61c.

  That is,

  A point to B point: Range in which a through hole can be installed

  B point to C point; the range where the through hole cannot be installed

  C point to D point: Range in which a through hole can be installed

  D point to E point; the range where the through hole cannot be installed

It becomes.

  This comparison is performed in the same manner with the assumed stress calculated from one beam end to the other beam end when a force is applied from a direction opposite to an arbitrary direction. A formable range is determined. Further, these comparisons are made for each ring-shaped hardware standard (diameter of the through hole). The calculated calculation result is appropriately stored in a storage device such as a memory or a hard disk.

  Next, the calculation result is read out from the memory or the storage device, and an image is displayed on the monitor that constitutes the output unit 4 in a region where the assumed stress does not exceed the proof stress, and the through hole can be formed (step 104). Here, the range in which the through hole can be formed is displayed as an image of the distance from the beam end and the allowable eccentric amount of the through hole, and for each ring-shaped hardware standard corresponding to the diameter of the through hole.

  As shown in FIG. 3, the right side of the monitor is an area 51 that displays a formable range 52 that is mainly a result of the examination, and an area 53 located below the area 31 at the lower left of the area is shown in FIG. 4. As shown in (c), the distance Lh from the beam end and the allowable eccentricity e of the through hole are shown in an easy-to-understand manner on the steel beam. The permissible eccentricity e of the through hole is the distance from the top end of the beam flange to the center of the through hole, as can be seen in the figure. The hole diameter ratio is a numerical value obtained by dividing the diameter of the through hole by the beam formation.

  As shown in FIG. 6, the formation range 52 of the through hole is output as the distance Lh from the beam end and the permissible eccentricity e of the through hole and for each ring-shaped hardware standard corresponding to the diameter of the through hole. For example, if you use a ring-shaped metal fitting of 100S with an inner diameter of 100 mm (here, OS ring is used, OS ring is a registered trademark of Okabe Co., Ltd.) It can be seen that a 100 mm through hole should be formed so that the distance Lh to 384 to 6616 mm and the eccentricity e to 131 to 351 mm.

  As described above, according to the steel beam through-hole reinforcement design support method and system according to the present embodiment, the through-hole formable range 52 is displayed for each ring-shaped hardware standard corresponding to the diameter of the through-hole. Since it is displayed, it can be grasped at a glance at which part of the steel beam the through-hole can be formed, and what standard ring-shaped hardware should be used at that time.

  Therefore, it becomes possible to carry out the reinforcement design of the through hole using the ring-shaped hardware much more quickly and reliably than the conventional method using a quick reference table or the like.

  In the present embodiment, the output unit 4 is configured to output the region where the assumed stress does not exceed the proof stress as the distance from the end of the steel beam and the allowable eccentricity with respect to the steel beam. The allowable eccentricity with respect to the beam may be omitted, and the distance from the end of the steel beam may be output.

  Further, in the present embodiment, the image is displayed as the distance from the beam end where the through hole can be formed. However, it is not always necessary to use the beam end as a reference. For example, the distance from the column center may be adopted. Good. Similarly, in the present embodiment, the range in which the through hole can be formed is the distance from the top end of the beam flange, but instead of this, for example, the distance from the member central axis of the beam may be used.

  Further, in the present embodiment, as the through hole forming range 52, the ring-shaped hardware corresponding to the diameter of the through hole is output together with the standard, that is, “100S”, “125S”, etc. The output may be performed together with the diameter of the through hole, that is, “100 mm”, “125 mm”, and the like.

The schematic diagram of the reinforcement design support system of the steel beam penetration hole concerning this embodiment. The flowchart which showed the procedure which implements the reinforcement design support method of the steel beam through-hole which concerns on this embodiment. The figure which showed a mode that the input value and the installation possible range of the through-hole were displayed on the monitor which comprises the output part 4. FIG. The state in which the input value is displayed is shown for each area. (A) is a detailed view showing the area 32, (b) is a detailed view showing the area 38, and (c) is showing the area 53. Detail view. MQ correlation curve representing proof stress and assumed stress superimposed on it. The detail figure which showed a mode that the formation possible range 52 of the through-hole was displayed.

Explanation of symbols

1 Steel beam through-hole reinforcement design support system 2 Input unit 3 Calculation unit 4 Output unit

Claims (4)

A method for supporting reinforcement design of a steel beam through-hole used when reinforcing a through-hole formed in a steel beam web using a ring-shaped hardware,
Enter the steel beam type and span length and long-term load conditions as input values,
The stress generated in the steel beam with respect to the input value is calculated in the state before the through hole is formed, and assumed stress,
The assumed stress is compared with the proof stress after the through-hole is formed and the ring-shaped hardware is reinforced in the through-hole,
A region where the assumed stress does not exceed the yield strength is output as a through-hole formable range together with the diameter of the through-hole or the standard of the ring-shaped hardware corresponding to the diameter of the through-hole. Reinforcement design support method. The method of supporting reinforcement design of a steel beam through-hole according to claim 1, wherein the region is output as a distance from the end of the steel beam, or a distance from the end of the steel beam and an allowable eccentricity with respect to the steel beam. In the reinforcement design support system for a steel beam through-hole used when reinforcing a through-hole formed in a steel beam web with a ring-shaped hardware,
An input unit for inputting the steel beam type and span length and long-term load conditions as input values;
The stress generated in the steel beam with respect to the input value is calculated in a state before the through-hole is formed and is assumed stress, and the assumed stress is after the through-hole is formed. A calculation unit for comparing the proof stress of the ring-shaped hardware reinforced in the through hole;
An output portion that outputs a region where the assumed stress does not exceed the proof stress and outputs the through hole as well as the diameter of the through hole or a ring-shaped hardware corresponding to the diameter of the through hole is provided. Steel beam through hole reinforcement design support system. 4. The steel beam through-hole reinforcement design support according to claim 3, wherein the output unit outputs the region as a distance from an end of the steel beam, or a distance from the end of the steel beam and an allowable eccentricity with respect to the steel beam. system.

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