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Method for calculating bearing capacity of steel cover plate node under action of bending moment force

A technology of bearing capacity and cover plate, which is applied in the field of engineering calculation, can solve the problems of damage, failure to consider bolt pre-tightening force, and few experimental studies of steel cover plate joints.

Inactive Publication Date: 2017-10-24
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Its research results and engineering experience in steel reticulated shells are still relatively lacking, and it needs to be supplemented and improved urgently.
However, there are still some deficiencies in the current research on cover plate joints, including: 1) The finite element analysis model is not accurate enough: most of the finite element analysis models do not consider the preload of bolts, and some models only consider the joint coupling and do not The solid model of the bolt is established, and some models do not consider the contact between the cover plate, the bolt and the rod; 2) Considering the complexity of the experimental research, the analysis of the cover plate joints is mainly based on the finite element model analysis, and the experimental research The number is also limited, and there are few experimental studies on steel cover joints; 3) At present, a set of bearing capacity formulas for cover joints under different stress states has not been proposed, mostly to explain the failure mechanism of cover joints

Method used

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  • Method for calculating bearing capacity of steel cover plate node under action of bending moment force
  • Method for calculating bearing capacity of steel cover plate node under action of bending moment force
  • Method for calculating bearing capacity of steel cover plate node under action of bending moment force

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Effect test

Embodiment 1

[0179] Given a steel cover plate node, the maximum axial force of the rod is 750kN, the maximum bending moment is 100kN·m, the diameter of the cover is 240mm, the thickness is 16mm, the rod is made of H-shaped steel, the steel is Q235B, and the section size is H250×125×6×8, bolt diameter is 16mm, arranged in 3 rows, such as Image 6 Shown. This cover node is now checked.

[0180] 1. First, calculate the design value N of its compressive bearing capacity under axial pressure u :

[0181] 1 If the bolt shear failure of the steel cover plate node first occurs, its shear capacity is

[0182]

[0183] Among them, the number of bolts on a single rod is n=3×2×2=12, refer to the specification f v b = 250MPa.

[0184] Therefore

[0185] 2 If the buckling failure of the center of the cover plate occurs first in the joint of the steel cover plate, the design value of the buckling failure bearing capacity of the center of the cover plate is:

[0186]

[0187] Among them, according to the arrange...

Embodiment 2

[0211] Given a steel cover plate node, the maximum axial force on the rod is 420kN, the maximum bending moment is 40kN·m, the diameter of the cover is 240mm, the thickness is 12mm, the rod is made of H-shaped steel, the steel is Q235B, and the section size is H250×125×6×8, bolt diameter is 14mm, arranged in 3 rows. This cover node is now checked.

[0212] 1. First, calculate the design value N of its compressive bearing capacity under axial pressure u :

[0213] 1 If the bolt shear failure of the steel cover plate node first occurs, its shear capacity is

[0214]

[0215] Among them, the number of bolts on a single rod is n=3×2×2=12, refer to the specification f v b = 250MPa.

[0216] Calculated

[0217] 2 If the buckling failure of the center of the cover plate occurs first in the joint of the steel cover plate, the design value of the buckling failure bearing capacity of the center of the cover plate is:

[0218]

[0219] Among them, according to the arrangement of bolts, the distan...

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Abstract

The present invention discloses a method for calculating a bearing capacity of a steel cover plate node under action of bending moment force, and belongs to the field of engineering. The method comprises: determining whether a to-be-calculated steel cover plate node meets a calculation formula provided by the present invention; and if the to-be-calculated steel cover plate node meets the calculation formula, determining that a bearing capacity of the steel cover plate node under action of bending moment force meets a requirement, and if the to-be-calculated steel cover plate node does not meet the calculation formula, determining that bearing capacity of the steel cover plate node under action of the bending moment force does not meet the requirement. The method for calculating the bearing capacity of the steel cover plate node under action of different loads provided by the present invention fills the research blank of the steel cover plate node and can provide a reference basis for engineering design.

Description

Technical field [0001] The invention belongs to the field of engineering calculations, and particularly relates to a method for calculating the bearing capacity under the action of the bending moment axial force of the steel cover plate node. Background technique [0002] The cover plate node is an aluminum alloy spatial grid structure node system developed by TEMCOR in the United States. It was initially only applied to aluminum alloy structures, and later gradually applied to steel structures due to its many advantages. This node is mainly composed of aluminum alloy circular cover plate, fastening bolts and aluminum alloy rods. The cross-section of the rod is usually H-shaped aluminum, and the rod ends of multiple rods meet at the center of the node, which are overlapped by upper and lower cover plates and fixed by bolts. Steel cover joints and aluminum alloy cover joints have the same structure, consisting of steel circular cover plates, fastening bolts and I-steel rods, such...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/50
CPCG06F30/17G06F30/23G06F2119/06
Inventor 高博青张生伟吴慧
Owner ZHEJIANG UNIV
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