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Regression analysis method of square steel pipe truss N type node bearing capacity for trestle

A technique of regression analysis and square steel pipes, applied in the direction of truss bridges, bridges, bridge forms, etc., to achieve the effects of perfect methods, accurate results, and small errors

Active Publication Date: 2018-11-23
NORTH CHINA UNIV OF WATER RESOURCES & ELECTRIC POWER
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the many changes in the dimensions, angles, and connection methods of the joints at the joints of the trestle trusses, the factors affecting the bearing capacity of the joints are extremely rich. Even in the current steel structure standards in my country, all the joints related factor into the bearing capacity calculation formula

Method used

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  • Regression analysis method of square steel pipe truss N type node bearing capacity for trestle
  • Regression analysis method of square steel pipe truss N type node bearing capacity for trestle
  • Regression analysis method of square steel pipe truss N type node bearing capacity for trestle

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Experimental program
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Effect test

Embodiment 1

[0054] Such as figure 1 As shown, a method for regression analysis of the bearing capacity of square steel pipe truss N-type joints for trestle bridges mainly includes the following steps:

[0055] Step 1: Combining four sets of dimensionless geometric parameters: β, γ, τ and O v Orthogonal experiments were designed, and the solid element SOLID185 in the ANSYS software element library was used to establish an N-type node model of a square steel pipe composed of chords, straight webs and diagonal webs. The solid element SOLID185 was defined by 8 nodes, and each A node has three degrees of freedom for translation along the x, y, and z directions. The straight web bar is connected vertically to the chord bar, and the diagonal web bar is connected to the chord bar at an angle of 60°. The chord in the N-type node model of the square steel pipe The length of rods, straight webs and oblique webs is three times the pipe diameter, and the diameter of the chord is 200mm, where β is the r...

Embodiment 2

[0085] Taking model No. 18 as an example, the finite element model diagram is obtained by using the method of step 2 in embodiment 1:

[0086] Depend on figure 2 It can be seen that when the web bears an axial force of 962kN, the maximum stress in this area is 549MPa, and the full-section stress of the web reaches more than 305MPa, basically entering a plastic state, and the chord top plate is in a point-like yield state in the peripheral area of ​​the web. When the load is reached, the load cannot continue to increase, and the node enters the failure state.

[0087] exist image 3 and Figure 4 In , the deformation effect is enlarged by 3 times, and the large displacement effect caused by the support at the end of each rod is ignored. When the straight web bar is loaded to 962kN, the center of the interface between the chord and the left side plate of the straight web bar shows a large positive deformation protruding from the surface of the chord, and the Uy displacement ...

Embodiment 3

[0090] Utilize the method of embodiment 1, measure the impact of β change on the ultimate bearing capacity of model nodes:

[0091] Keeping γ and τ constant, and β gradually increasing, the change trend of the ultimate bearing capacity of the model nodes is shown in Table 2:

[0092] Table 2 Ultimate bearing capacity of nodes under the influence of β

[0093]

[0094]

[0095] Conclusion: On the premise of keeping γ and τ constant, when β gradually increases, the ultimate bearing capacity of the model all shows an upward trend, O v The change of β basically has no effect on the change trend of bearing capacity with β value. It shows that as the diameter of the web increases, the overall stiffness of the joint increases, and the bearing capacity of the joint increases.

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Abstract

The invention discloses a regression analysis method of square steel pipe truss N type node bearing capacity for trestle. The method comprises the steps of (1) establishing a square steel pipe N typenode model composed of a chord member, a straight web member and a diagonal web member, and setting four sets of nondimensional geometric parameters: beta, gamma, tau and Ov; (2) applying an axial pulling force N1 along the straight web member, applying an axial pressure N2 along the diagonal web member, and obtaining an ultimate bearing capacity of the square steel pipe N type node model by ANSYSsoftware; (3) performing the analysis of variance without interaction under the influence of the four types of geometric factors for the N type node bearing capacity by using the statistical softwareIBM SPSS; (4) obtaining a regression equation of the N type node ultimate bearing capacity by using the multiple linear regression method in the mathematical statistics principle; (5) performing a discrete degree check of the N type node ultimate bearing capacity regression formula. In conclusion, the method has the advantages of perfect method, accurate result and small error and the like.

Description

technical field [0001] The invention belongs to the technical field of steel pipe truss design, in particular to a regression analysis method for the bearing capacity of N-type joints of square steel pipe trusses used for trestle bridges. Background technique [0002] In recent years, along with the upsurge of building large-scale buildings, some new building materials and building technologies have emerged continuously. As a superior material integrating safety, economy and aesthetics, the hollow tube has attracted more and more attention from the engineering field. Hollow tube structure refers to the use of hollow steel tubes in all or part of the steel structure. As far as the composition of the steel pipe structure is concerned, it was a round steel pipe structure in the early stage, and then a square steel pipe structure, a combined structure of a square steel pipe and a round steel pipe appeared. The steel pipe can be used as the pillar of the building, forming a fra...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/50E01D6/00E01D101/30
CPCE01D6/00E01D2101/30G06F30/23G06F30/13G06F2119/06
Inventor 王慧
Owner NORTH CHINA UNIV OF WATER RESOURCES & ELECTRIC POWER
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