不锈钢焊接截面薄腹梁剪切屈曲计算方法  

CALCULATION METHOD FOR SHEAR BUCKLING RESISTANCES OF WELDED STAINLESS STEEL PLATE GIRDERS

作　　者：陈晓婉[1] 袁焕鑫[1] 杜新喜[1] 马艳伟 CHEN Xiaowan;YUAN Fluanxin;DU Xinxi;MA Yanwei(School of Civil Engineering,Wuhan University,Wuhan 430072,China;Giant Urban Planning & Architecture Design Co.Ltd,Zhengzhou 450000,China)

机构地区：[1]武汉大学土木建筑工程学院,武汉430072 [2]匠人规划建筑设计股份有限公司,郑州450000

出　　处：《钢结构》2018年第12期37-42,共6页Steel Construction

基　　金：国家自然科学基金项目(51508424);湖北省自然科学基金项目(2018CFB441)

摘　　要：建立精细的有限元模型对不锈钢焊接截面薄腹梁剪切屈曲性能进行数值模拟,并依据试验结果对模型进行验证。基于验证可靠的有限元模型,对构件局部几何初始缺陷、刚性封头肋板、不锈钢材料力学性能等关键参数开展系统分析。结合所得的数值计算结果和现有的试验数据,对我国GB 50017—2017《钢结构设计标准》和EN 1993-1-4+A1《欧洲不锈钢结构设计规范》中的抗剪承载力计算方法进行评估,在此基础上提出了可同时考虑腹板与翼缘的抗剪承载力以及刚性封头肋板等因素影响的承载力计算式。与试验和有限元计算结果比较表明:所建议的计算方法可以更加准确计算不锈钢焊接截面薄腹梁的剪切屈曲承载力。Elaborate finite element(FE)models capable of simulating the shear buckling behavior of stainless steel plate girders were developed and validated against the obtained test results and other existing test data. Upon validation of the FE models, parametric studies were carried out to explore the influences of initial local imperfections,rigid end posts and material properties. The test data and FE results were therefore used to assess the design provisions in GB 50017-2017 and EN 1993-1-4+A1. Furthermore, a new design approach that could account for the contributions from flanges and the strengthening effects of rigid end posts was proposed, which could provide more accurate and reasonable predictions for shear buckling resistances for welded stainless steel plate girders.

关 键 词：不锈钢结构 剪切屈曲 焊接薄腹梁 有限元方法 计算方法 

分 类 号：TU391[建筑科学—结构工程]