|Table of Contents|

Calculation of post-buckling strength of simply supported screw built-up thin steel plate(PDF)

《建筑科学与工程学报》[ISSN:1673-2049/CN:61-1442/TU]

Issue:
2025年02期
Page:
82-92
Research Field:
建筑结构
Publishing date:

Info

Title:
Calculation of post-buckling strength of simply supported screw built-up thin steel plate
Author(s):
ZHANG Lei;  ZHOU Tianhua;  SANG Liurui;  WANG Shuaibing
(School of Civil Engineering, Chang'an University, Xi'an 710061, Shaanxi, China)
Keywords:
cold-formed steel;  screw built-up thin steel plate;  energy principle;  back-to-back built-up column;  axial compression test
PACS:
TU392.5
DOI:
10.19815/j.jace.2023.04147
Abstract:
To investigate the post-buckling strength of screw built-up thin steel plate, axial compression tests were carried out on 21 cold-formed steel back-to-back built-up columns with self-drilling screw connections, and numerical simulation analysis of the specimens was carried out using ABAQUS finite element software. On the basis, taking the built-up web of the back-to-back section column as the research object, considering the shear slip deformation of the screw-plate connection interface and the constraint effect of the self-drilling screw on the built-up plate, the calculation model for the post-buckling stress of the screw built-up thin steel plate was established and the analytical expression for the post-buckling stress of simply supported screw built-up thin steel plates was derived. In order to expand the applicability of the formula, it was modified and compared with experimental and finite element results to analyze and evaluate the applicability. The results show that the relative error between the finite element analysis and experimental results is controlled within 10%. The numerical model accurately reflects the deformation and failure characteristics of the specimens under axial compression and the model has high accuracy. With the increase of the built-up plate width-thickness ratio, the calculation results of the derived analytical expression for the post-buckling stress of the screw built-up thin steel plate tend to be conservative. Within the common range of changes in the width-thickness ratio of cold-formed steel built-up plates, the post-buckling stress calculation results of the modified screw built-up thin steel plate formula are in good agreement with the experimental results, indicating that the modified analytical expression has good accuracy and applicability.

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Last Update: 2025-03-20