JP5964724B2 - Analysis method for frame structure with columns, beams and load-bearing frames - Google Patents

Description

  The present invention relates to a method for analyzing a frame body having columns, beams, and load-bearing frames.

  Conventionally, as shown in FIG. 1, a computer analysis is performed on a frame 1 having a column 2, a beam 3, and a strength frame 5. As shown in FIG. 2, the analysis model of the frame 1 includes a column 2, a beam 3, a column 2 on both sides, and a load-bearing frame 5 made of a brace material 4 disposed between the columns 2 ( The beam 3 and the brace material 4 are joined to each other at, for example, a pin joint or the like.

  As shown in FIG. 3, in the analysis flow, after the computer starts, data of a frame 1 model (described later) is input (step S1), and analysis conditions such as force and displacement applied to the frame 1 are input. Then, an analysis by a computer is performed (step S3), and an analysis result such as a force and a displacement applied to the member of the frame 1 is output (step S4), and the process ends.

  Then, in performing the analysis, an analysis model of the frame 1 input in step S1 is created. Conventionally, as shown in FIG. 6, the analysis model of the frame 1 is first created as shown in FIG. 6. First, in step S <b> 21, the frame 1 including the column 2, the beam 3, and the load-bearing frame 5 is made of the wire 2. (Including the column 2 of the load-bearing frame 5)-By replacing the beam 3 and the brace material 4, the shape of the analysis model is specified. Next, as step S22, member characteristics such as the cross-sectional area of the column 2 and the beam 3 and an elastic coefficient such as a longitudinal elastic coefficient are set. At this time, the cross-sectional area of the column 2 / beam 3 is the column 2 of the specifications of the column 2 / beam 3 (the height / cross-sectional shape / thickness of the column 2 / the length / cross-sectional shape / thickness of the beam 3). 2 is determined from the cross-sectional performance master according to the cross-sectional shape / thickness 2 and the cross-sectional shape / thickness of the beam 3. The cross-sectional performance master is prepared in advance as a table by experimentation or the like. Next, as step S23, member characteristics such as the specification (length) of the brace material 4 and an elastic coefficient such as a longitudinal elastic coefficient are set. At this time, the equivalent cross-sectional area is used as the cross-sectional area of the brace material 4 instead of the actual cross-sectional area. The equivalent cross-sectional area is determined from the equivalent cross-sectional area master according to the specifications of the load-bearing frame 5 (the height of the column 2 and the distance between the two columns 2), which will be described later. Similar to the cross-sectional performance master, the equivalent cross-sectional area master is prepared in advance as a table by experimentation or the like.

  Based on the analysis model of the frame 1 created in this way, an analysis is performed by a computer in step S3 (see, for example, Patent Document 1).

JP 2000-057181 A

  Conventionally, in the analysis model of the frame 1 described above, the equivalent cross-sectional area smaller than the actual cross-sectional area is used as the cross-sectional area of the brace material 4. That is, the analysis is performed based on an analysis model obtained by simplifying the frame 1, and in the actual frame 1, deformation or deviation that does not occur in the analysis occurs. For this reason, the rigidity of the load-bearing frame 5 obtained from the experiment is often lower than the rigidity of the load-bearing frame 5 obtained from the analysis. Therefore, the equivalent cross-sectional area of the brace material 4 used in the analysis is smaller than the actual cross-sectional area so that the rigidity of the load-bearing frame 5 obtained from the analysis matches or approximates as much as possible the rigidity of the load-bearing frame 5 obtained from the experiment. The value was used. However, even by analysis using the equivalent cross-sectional area of the brace material 4, it is difficult to sufficiently approximate the rigidity of the load-bearing frame 5 obtained from the experiment.

  That is, as described above, the equivalent cross-sectional area of the brace material 4 is determined from the equivalent cross-sectional area master according to only the specifications of the load-bearing frame 5 (the height of the column 2 and the distance between the columns 2), and other conditions. In particular, the influence due to the distance between the pillars 2 located on both sides of the load-bearing frame 5 is not reflected. The rigidity of the load-bearing frame 5 obtained from the experiment was different even when the specifications of the load-bearing frame 5 were the same when the distance between the pillars 2 located on both sides of the load-bearing frame 5 was different. For this reason, in the analysis in which the influence due to the distance between the pillars 2 located on both sides across the strength frame 5 is not reflected, the rigidity of each strength frame 5 cannot be approximated to the rigidity of the strength frame 5 obtained from an experiment. It was difficult to improve the accuracy of analysis.

  The present invention has been invented in view of the above-described conventional problems, and the object of the present invention is to provide a method for analyzing a frame structure having columns, beams, and load-bearing frames, which can perform highly accurate analysis. The issue is to provide.

In order to solve the above-mentioned problems, the present invention provides a column, a beam, and a load-bearing frame made of a column and a brace material. The column having the length, the beam, and the load-bearing frame made of the column and the brace material are replaced with the length / joining location and joining method of each wire, and the elastic coefficient and breaking of each wire. A frame model including an area is created, and the computer analyzes based on the frame model and analysis conditions loaded on the frame model, and includes a column, a beam, and a load-bearing frame. In the creation of the frame model, the cross-sectional area of the brace material of the load-bearing frame, the distance between the columns and the length of the columns of the load-bearing frame, From tables predefined on the basis of the distance between the posts located on both sides of the force frame, which corresponds to an equivalent cross-sectional area is selected, the column located on both sides of the load bearing frame The distance between them is the distance between the pillars that are closest to the load-bearing frame on both sides of the load-bearing frame while supporting the beam mounted on the lower side, and are attached to the lower side. When the beam is a non-displacement foundation beam, the distance between the columns of the load-bearing frame is set to be the distance between the columns of the load-bearing frame. When the end is connected to and supported by another beam, the end of the beam connected to the other beam and the other side of the load-bearing frame of the beam support the beam. The load bearing frame It is the distance between the posts located proximate to and said.

  In the present invention, by considering the influence of the distance between the columns located on both sides across the load-bearing frame, it becomes possible to analyze with high accuracy, improve the safety of the building, and overdesign. Costs are prevented from expanding unnecessarily.

It is the whole frame structure schematic in one embodiment of the present invention. It is the whole frame model schematic same as the above. It is an analysis flow in the same as above. It is the flow of analysis model creation in the same as the above. It is an equivalent cross-sectional area master in the same as above. It is a flow of conventional analysis model creation.

  Hereinafter, the present invention will be described based on the embodiment shown in FIGS.

  In the analysis of the present invention, for example, a frame 1 such as a steel frame of a prefabricated house is to be analyzed.

  As shown in FIG. 1, the frame body 1 includes columns 2, beams 3, load-bearing frames 5 made of braces 4 disposed between the columns 2 on both sides. In the embodiment shown in FIG. 1, a first-floor column 2a is erected on a foundation beam 3a, and a second-floor floor beam 3b is installed on the upper end of the first-floor column 2a. Moreover, the brace material 4 is constructed between the adjacent pillars 2 of a part of the first floor, and the load bearing frame 5 is configured by the brace material 4 and the pillars 2 on both sides thereof. A second-floor pillar 2b is erected on the second-floor floor beam 3b, and a roof beam 3c is installed on the upper end of the second-floor pillar 2. Moreover, the brace material 4 is constructed between the some adjacent pillars 2 of the 2nd floor, and the load-bearing frame 5 is comprised by the brace material 4 and the pillar 2 of the both sides. In addition, although the frame 1 of this embodiment is the frame 1 of a two-story building, it may be the frame 1 of a building having three or more floors, and the number of floors is not limited.

  In the present embodiment, for example, a horizontal module having a predetermined span (length) such as 90 cm or 1 m as a basic unit (1P) in the horizontal direction, and a predetermined height such as 260 cm as a basic unit in the vertical direction. The frame body 1 is configured based on the vertical module. Further, the horizontal module and the vertical module can be finely adjusted by submodules smaller than this. For example, as the beam 3 or the load-bearing frame 5, a horizontal length (width) of 60 cm or 45 cm is used, or a column is used. 2 may have a vertical length (height) of 245 cm or 275 cm. In addition, it does not need to be modularized.

  Hereinafter, the analysis flow will be described. First, a frame model is created prior to execution of the analysis flow. The frame model is obtained by simplifying the actual frame 1 so that it can be analyzed by a computer (electronic computer). In this embodiment, the actual column 2 (the column 2 of the load-bearing frame 5 shown in FIG. 1). The beam 3 and the brace material 4 are replaced with the pillar 2 made of wire, the beam 3 and the brace material 4 as shown in FIG. 2, and processed into data that can be processed by a computer. is there. Each wire rod (column 2, beam 3 and brace material 4) of the frame model is joined to other wire rods by a predetermined joining method. In this embodiment, as shown in FIG. Most of the portions are joined to the ends of other wires by pin joining, but the column 20 has a free end at the upper end. The data of the frame model includes at least the length / joining location and joining method of each wire, the elastic coefficient such as the longitudinal elastic modulus of each wire, and the cross-sectional area. The data of the frame model may be stored as electronic data in a storage medium, or may be saved by other means. This frame model will be described in detail later. In the embodiment shown in FIG. 2, the analysis is performed on the assumption that the foundation beam 3a is not replaced with a wire and the foundation beam 3a is not displaced.

  As shown in FIG. 3, the analysis flow is started by the computer, and then in step S1, data of the frame model is input and installed in a storage area used in the calculation of the computer. The frame model data may be input by reading the electronic data of the frame model from the storage medium storing the electronic data and placing it in the storage area, or stored by other means. The data may be placed in the storage area by the operator operating input means such as a mouse, keyboard, or touch panel. The form of the storage medium or storage area (form of a hard disk drive, volatile memory, etc.) is not limited.

  Next, in step S2, analysis conditions are input. Examples of the analysis conditions include a force applied to a specific part of the frame body 1 in a specific direction and a specific direction, and a displacement generated at a specific part of the frame body 1 with a specific size. It is not limited to. Similarly to the frame model data, the analysis condition data may be read by reading the electronic data from a storage medium stored as electronic data and installing it in a storage area. Electronic data may be installed in the storage area by operating input means such as a keyboard or a touch panel.

  Next, in step S3, a computer analysis is performed. As the analysis method, the finite element method is preferably used, but other methods or a method in which a plurality of methods are combined may be used, and various conventionally known methods can be appropriately used, and particularly limited. Further, detailed description is omitted. Also, various known computers such as so-called personal computers can be used as appropriate, and are not particularly limited, and detailed description thereof is omitted.

  After the analysis by the computer is performed, the analysis result is output in step S4. Examples of the analysis result include, but are not limited to, a force (axial force or moment) or displacement applied to a specific member (column 2, beam 3 or brace material 4) of the frame 1. The analysis condition data is output as electronic data stored in a storage medium, displayed on a display, or printed on a paper medium. After outputting the analysis result in step S4, the analysis flow ends.

  Hereinafter, creation of an analysis model of the frame body 1 of the present invention will be described. As shown in FIG. 4, the analysis model of the frame 1 is first created as shown in FIG. 4, in step S 11, the frame 1 including the column 2, the beam 3, and the load-bearing frame 5 is made up of the columns 2 (load-bearing frame). 5) (including column 2), beam 3 and brace material 4, the length of each of these wires (column 2, beam 3 and brace material 4), the joining location with other wires and the joining method are set. Thus, the shape of the analysis model is specified. Step S11 is the same as step S21 shown in FIG.

  Next, as step S12, member characteristics such as the cross-sectional area of the column 2 and the beam 3 and the elastic coefficient such as the longitudinal elastic coefficient are set. At this time, the cross-sectional area of the columns 2 and 3 is the specifications of the columns 2 and 3 (the height (length), the cross-sectional shape and the thickness of the column 2, the length, the cross-sectional shape and the thickness of the beam 3, ) In accordance with the cross-sectional shape / thickness of the column 2 and the cross-sectional shape / thickness of the beam 3. The cross-sectional performance master is prepared in advance as a table by experimentation or the like. Step S12 is the same as step S22 shown in FIG.

  Next, as step S13, the distance between the pillars 2 located on both sides of the load-bearing frame 5 (hereinafter referred to as the distance between the pillars) is recognized. In the present embodiment, in the case of the load-bearing frame 5 on the first floor, the distance between the columns 2 on both sides of the load-bearing frame 5 is the distance between the columns. In the case of the load-bearing frame 5 on the upper floor, the lower beam 3 attached to the lower end of the load-bearing frame 5 is supported, and the distance between the pillars 2 located on both sides of the load-bearing frame 5 is Distance between columns.

  That is, for the strength frames 51 to 53 on the first floor, as shown in FIG. 1, the beam 3 attached to the lower side is the foundation beam 3a, and as shown in FIG. Since there is no wire corresponding to the foundation beam 3a, the distance between the pillars 2 on both sides of each of the strength frames 51 to 53 is recognized as the distance between the pillars. Further, as shown in FIG. 2, the load-bearing frame 54 on the second floor supports the beam 31 attached to the lower side thereof, and the distance between the pillars 21 and 22 located on both sides of the load-bearing frame 54. L1 is the distance between the columns. The load bearing frame 55 supports the beam 32 attached to the lower side thereof, and the distance L2 between the columns 23 and 24 located on both sides of the load bearing frame 55 is the distance between the columns. The load-bearing frame 56 supports the beam 33 attached to the lower side thereof, and a distance L3 between the columns 25 and 26 located on both sides of the load-bearing frame 56 is an inter-column distance.

  Further, in the load-bearing frame 5 on the upper floor, the column 2 supporting the beam 3 below the load-bearing frame 5 is not at the end of the beam 3, and the end of the beam 3 is connected to another beam 3. In this case, the distance between the end of the beam 3 connected to the other beam 3 and the column 2 supporting the beam 3 is the inter-column distance.

  Next, as step S14, an equivalent cross-sectional area of the brace material 4 included in the load-bearing frame 5 is set. Here, the equivalent cross-sectional area depends on the specifications of the load-bearing frame 5 (the length of the columns 2 included in the load-bearing frame 5 and the distance between the two columns 2) and the distance between the columns of the load-bearing frames 5 obtained in step S13. And determined from the equivalent cross-sectional area master. Similar to the cross-sectional performance master, the equivalent cross-sectional area master is prepared in advance as a table by experimentation or the like. FIG. 5 shows a part of an example of an equivalent cross-sectional area master (part of specifications of the load-bearing frame 5, distance between columns, equivalent cross-sectional area).

  Even if the specifications of the load-bearing frame 5 are the same from the equivalent cross-sectional area master, the longer the inter-column distance, the larger the equivalent cross-sectional area. When the inter-column distance is long, the analysis is performed with a large cross-sectional area. The actual rigidity of the frame 5 can be approximated.

  That is, when the equivalent cross-sectional area determined only from the specifications of the load-bearing frame 5 is used as in the prior art, when the distance between the columns is long, a cross-sectional area that is larger than the equivalent cross-sectional area should be originally set. Analysis is performed with a smaller cross-sectional area, and the rigidity of the load-bearing frame 5 is evaluated to be smaller than actual.

  For this reason, conventionally, it is difficult to perform an accurate analysis, and when a safety design is performed based on the analysis result, the number of proof stresses equal to or more than the number of proof stress frames 5 that the frame body 1 originally needs. Frame 5 is required. As a result, the design becomes excessive, and the cost may be unnecessarily expanded.

  On the other hand, in the present invention, since the analysis can be performed with the rigidity that is the same as or approximate to the rigidity of the actual load-bearing frame 5, an accurate analysis can be performed. As a result, it is possible to improve the safety of the building, and it is possible to eliminate the trouble of repeating excessive experiments and examinations due to excessive design and cost expansion unnecessarily, or the analysis result cannot be trusted.

DESCRIPTION OF SYMBOLS 1 Frame 2 Column 20-26 Column 3 Beam 31-33 Beam 4 Brace material 5 Strength frame 51-56 Strength frame

Claims (1)

The column of the frame having a column, a beam, and a load-bearing frame made of a column and a brace material, the beam and the brace material are each made of a wire material and have a predetermined length, and the beam. The frame is replaced with the load-bearing frame made of the pillar and the brace material, and a frame model including the length / joining location and joining method of each wire, and the elastic coefficient and cross-sectional area of each wire is created,
A method of analyzing a frame having columns, beams, and a load-bearing frame, which is analyzed by a computer based on the frame model and an analysis condition loaded on the frame model,
In creating the frame model, as the cross-sectional area of the brace material of the load-bearing frame, the distance between the columns and the length of the columns of the load-bearing frame, and the columns located on both sides of the load-bearing frame The corresponding equivalent cross-sectional area is selected and set from a predetermined table based on the distance between ,
The distance between the pillars located on both sides of the load-bearing frame is set such that the pillars that support the beam attached to the lower side and are located closest to the load-bearing frame on both sides of the load-bearing frame. When the beam mounted on the lower side is a non-displacement foundation beam, the distance between the columns of the load-bearing frame is set, and the load-bearing frame of the beam mounted on the lower side. When the column is not on one side and the end of the beam is connected to and supported by another beam, the end of the beam connected to the other beam and the beam A method of analyzing a frame having a column, a beam, and a load-bearing frame, which is a distance between the column positioned closest to the load-bearing frame that supports the beam on the other side of the load-bearing frame.

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