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Method for determining calculated length of rod piece with large-span spatial structure and complicated boundary conditions

A method of determining and calculating length, applied in the direction of building structure, construction, etc., can solve problems such as the influence of the stable bearing capacity of the main member and the change of the axial force of the member, so as to make up for the shortcomings of the calculation of length research, improve the accuracy, The effect of enriching design theory

Active Publication Date: 2014-01-29
SHENZHEN GENERAL INST OF ARCHITECTURAL DESIGN & RES
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Problems solved by technology

[0022] The further purpose of the present invention is to solve the problem that complex boundary conditions cause changes in the axial force of the bar and induce the influence on the stable bearing capacity of the main bar

Method used

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  • Method for determining calculated length of rod piece with large-span spatial structure and complicated boundary conditions
  • Method for determining calculated length of rod piece with large-span spatial structure and complicated boundary conditions
  • Method for determining calculated length of rod piece with large-span spatial structure and complicated boundary conditions

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Embodiment Construction

[0058] The present invention will be further described below with examples in conjunction with the above-mentioned accompanying drawings.

[0059] The structure analyzed in this embodiment is a single-layer folded space grid structure, such as Figure 12 shown. Wherein the triangular unit structure constituting the single-layer folding space grid structure is as follows figure 1 As shown, the main rod 1 located at the intersection of the triangular surfaces is composed of circular steel pipes with the same outer diameter and different wall thicknesses. Among them, the boundary conditions of the main member 1 are complex: the angle between the receiving surface and the surface varies from 90° to 150°; the secondary member 2 at the quarter point, and the section height of the secondary member 2 is 0.3 to 0.8 times the section height of the main member 1; And the influence of complex boundary conditions of nodes 3 at both ends.

[0060] In the long-span space structure compose...

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Abstract

The invention belongs to the field of structural engineering. The technical problems to be solved are to overcome the shortcomings of the prior art and provide a relatively more precise method for determining the calculated length of a primary steel member with a large-span spatial structure and complicated boundary conditions. The method comprises the following steps of: 1, performing characteristic value buckling analysis on an integral structure under load control working condition to obtain the buckling mode of each order; 2, applying minor geometric imperfection by taking a rod piece destabilization mode obtained by the characteristic value buckling analysis as an initial state of form, and performing geometrically nonlinear elastic bearing capability process analysis on the integral structure; 3, in a bearing capability losing process of the integral structure, tracking the axial force-displacement changing conditions of a rod piece, and judging the occurrence of a critical load according to whether an axial force reaches a maximum value and is declined or not; and 4, determining the calculated length of the rod piece according to a formula, wherein the steps are finished by a computer.

Description

technical field [0001] The invention belongs to the field of structural engineering, and more specifically relates to a method for determining the calculated length of a member with complex boundary conditions in a long-span space structure. Background technique [0002] Many existing architectural design structures are applied to the truss or reticulated shell structure composed of rod trusses, and more and more building structures adopt this kind of structural shape as a whole. Therefore, for the truss or reticulated shell truss The analysis of rods and rods is becoming more and more important. In different structures of rods, how to determine the equivalent length of rods for calculation is an important parameter and a necessary prerequisite for structural elastic analysis of rods. With the enlargement of the overall structure of the truss, especially the complex long-span space structure, the boundary conditions of the members are becoming more and more complicated, and ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E04B1/342
Inventor 张建军刘琼祥刘臣郭满良杨德喜彭省华王启文彭德昭李晖
Owner SHENZHEN GENERAL INST OF ARCHITECTURAL DESIGN & RES
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