Experimental and Numerical Study of Membrane Residual Stress in Q690 High-Strength Steel Welded Box Section Compressed Member

Author:

Wang Jie1,Xu Aimin2,Di Jin13,Qin Fengjiang3ORCID,Men Pengfei3

Affiliation:

1. College of Civil Engineering and Architecture, Zhejiang University, Hangzhou 310058, China

2. High Grade Highway Construction Management Center of Ningbo City, Ningbo 315192, China

3. Key Laboratory of New Technology for Construction of Cities in Mountain Area, School of Civil Engineering, Chongqing University, Chongqing 400045, China

Abstract

High-strength steel (HSS) members with welded sections exhibit a notably lower residual compressive stress ratio compared with common mild steel (CMS) members. Despite this difference, current codes often generalize the findings from CMS members to HSS members, and the previous unified residual stress models are generally conservative. This study focuses on the membrane residual stress distribution in Q690 steel welded box sections. By leveraging experimental results, the influence of section sizes and welding parameters on membrane residual stress was delved into. A larger plate size correlates with a decrease in the residual compressive stress across the section, with a more pronounced reduction observed in adjacent plates. Additionally, augmenting the number of welding passes tends to diminish residual stresses across the section. Results showed that membrane residual stress adhered to the section’s self-equilibrium, while the self-equilibrium in the plates was not a uniform pattern. A reliable residual stress simulation method for Q690 steel welded box sections was established using a three-dimensional thermal–elastic–plastic finite element model (3DTEFEM) grounded in experimental data. This method served as the cornerstone for parameter analysis in this study and set the stage for subsequent research. As a result, an accurate unified residual stress model for Q690 steel welded box sections was derived.

Funder

National Natural Science Foundation of China

Key technology project in the transportation industry

Chongqing Municipal Construction Science and Technology Plan Project

Science and Technology Innovation Fund Project of CCCC first highway consultants Co., Ltd

Publisher

MDPI AG

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