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Primary line elasticity estimation method for ultimate bearing capacity analysis for space circular tube structure

A technology of ultimate bearing capacity and structural analysis, applied in the direction of calculation, computer-aided design, special data processing application, etc., can solve the problems of complex calculation process, low calculation efficiency, difficult engineering application, etc., and achieve the effect of high calculation accuracy

Inactive Publication Date: 2017-04-26
GUANGXI UNIV
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AI Technical Summary

Problems solved by technology

EPIA has a reliable theory and high calculation accuracy. Its effectiveness has been verified by a large number of model experiments. It has been applied to circular tubular structures such as steel frames and steel pipe arch bridges. It is usually used to test the accuracy of other analysis methods, but it solves engineering structures. The ultimate bearing capacity needs to consider the complex loading process, and the calculation amount is large; MPA is a mathematical optimization method based on the limit theorem to solve the constraints, but its nonlinear constraints and objective functions will make the calculation amount large and the calculation efficiency is low; EMAP The principle is simple and can avoid the complex elastic-plastic analysis process, but it requires multiple linear elastic iterative analysis and adjustment of elastic modulus, resulting in complicated calculation process and difficult engineering application

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  • Primary line elasticity estimation method for ultimate bearing capacity analysis for space circular tube structure
  • Primary line elasticity estimation method for ultimate bearing capacity analysis for space circular tube structure
  • Primary line elasticity estimation method for ultimate bearing capacity analysis for space circular tube structure

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specific example

[0042] This embodiment is a specific example of the primary linear elasticity estimation method for the ultimate bearing capacity analysis of the space circular tube structure, including the following steps:

[0043] (1) Establish an analysis model of the spatial circular pipe structure:

[0044] The span of a certain space tube structure is L=4m, and the geometric dimensions and material parameters of other space tube structures are shown in Table 1. Bearing the vertical concentrated load P and the horizontal concentrated load P, the calculation model of the space circular pipe structure is as follows figure 1 As shown, its cross-section and stress distribution are as figure 2 Shown. Using ANSYS software for modeling and beam element simulation, the finite element mesh of the spatial circular tube structure is like image 3 .

[0045] Table 1 The geometric dimensions and material parameters of the space tube structure

[0046] parameterOuter radius R O / m

Inner radius R I / m...

Embodiment 2

[0057] For the analysis of the ultimate bearing capacity of the space circular tube structure described in Example 1, the calculation accuracy has been obtained by EPIA recognized in the field for solution, and the ANSYS software is used to extract the number of iterations required for EPIA to solve the ultimate bearing capacity. The calculation results are shown in Table 4. .

[0058] Table 4 Comparison of calculation accuracy and efficiency between EPIA and the primary linear elasticity estimation method

[0059]

[0060]

[0061] It can be seen from Table 4 that the ultimate bearing capacity of the space circular tube structure solved by the linear elasticity estimation method has good calculation accuracy, and the error with EPIA is only 0.32%. EPIA requires 111 iteration steps to solve the ultimate bearing capacity of the spatial circular tube structure, and multiple iterations will cause long calculation time. However, the method of the present invention only requires one lin...

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Abstract

Disclosed is a primary line elasticity estimation method for ultimate bearing capacity analysis for a space circular tube structure. The primary line elasticity estimation method comprises the following steps of (1) establishing a space circular tube structure analysis model; (2) determining a failure unit; and (3) calculating the ultimate bearing capacity of the space circular tube structure through the primary line elasticity estimation method. By adoption of the primary line elasticity estimation method, the ultimate bearing capacity of the space circular tube structure can be accurately and rapidly solved; the shortcomings that a complex loading process and multiple times of increment iteration analysis are needed in solving the ultimate bearing capacity of the space circular tube structure by an elastic plastic increment analysis method in ultimate bearing capacity analysis for universal structures are overcome; and therefore, an efficient method is provided for evaluation of the overall security of the space circular tube structure.

Description

Technical field [0001] The invention relates to a numerical method for analyzing the ultimate bearing capacity of a space circular tube structure, in particular to a linear elastic estimation method for the ultimate bearing capacity analysis of a space circular tube structure. Background technique [0002] Round tube is a typical thin-walled member with the advantages of biaxial symmetry and relatively high rigidity. It is often used as an important load-bearing component in structural systems and is widely used in construction engineering, bridge engineering, and power transmission and transformation engineering. Unlike planar circular tube structures that usually consider the effects of axial force and unidirectional bending moments, spatial circular tube structures need to consider the combined effects of axial force and bidirectional bending moments. Therefore, ensuring the safety of the space circular tube structure is a very important engineering problem, and the ultimate b...

Claims

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Application Information

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IPC IPC(8): G06F17/50
CPCG06F30/17G06F30/23G06F2119/06
Inventor 张伟张阳陈正陈嘉其
Owner GUANGXI UNIV
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