H形钢构件双向压弯加载下的破坏机理  

Failure mechanism of H-section steel members under bidirectional bending and compression

作　　者：张超 程欣[1] 段德馨 ZHANG Chao;CHENG Xin;DUAN Dexin(College of Civil Engineering, Taiyuan University of Technology, Taiyuan 030024, China;School of Naval Architecture, Ocean and Civil Engineering, Shanghai Jiao Tong University, Shanghai 200240, China)

机构地区：[1]太原理工大学土木工程学院,太原030024 [2]上海交通大学船舶海洋与建筑工程学院,上海200240

出　　处：《中国科技论文》2022年第6期673-680,共8页China Sciencepaper

基　　金：国家自然科学基金资助项目(51978437)。

摘　　要：为了探究H形截面钢构件在双向压弯加载下的破坏机理和主要破坏模态,考察了板件之间的相关作用和截面平均应力分布形式对H形钢构件破坏模态的影响特性。首先采用软件ABAQUS建立考虑构件初始缺陷和材料强化影响的有限元模型,并与试验结果进行校核;然后采用与试验中相同的双向压弯直线型加载方式,对影响H形钢构件双向压弯性能的4个关键参数进行批量化参数分析;最后基于大量有限元参数分析结果,根据模型在极限状态时刻的破坏特征,将其分为4种典型的破坏模态:全塑性破坏、翼缘屈曲破坏、腹板屈曲破坏及翼缘腹板屈曲破坏,并分别阐释了其各自发生的参数范围及破坏机理。分析发现:4个关键影响参数通过不同方式来决定构件的最终破坏模态,翼缘和腹板宽厚比组配作为主导影响因素,以板件相关作用为纽带影响构件的破坏模态;而轴压比和加载方向角则是通过改变截面平均应力的分布形式来影响构件的破坏模态。In order to explore the failure mechanism of H-section steel members under bidirectional bending and compression,the plate interaction effects and the influence of section stress distribution on the failure mode of H-section steel members were investigated.The general software ABAQUS was used to establish the finite element model considering the influence of initial defects of members and material strengthening.After verification with the test results,four key parameters affecting bidirectional bending and compression performance were analyzed by batch parameter analysis using the same bidirectional bending and compression linear loading method in the test.Based on a large number of finite element parametric analysis results,according to the failure characteristics of the model at the ultimate state determined by the energy inflection point method,the failure characteristics of the model were divided into four typical different modes,namely,total plastic failure,flange buckling failure,web buckling failure and flange web buckling failure,then their respective parameter ranges and failure mechanisms were explained.It is found that the final failure mode of the member is influenced by four key parameters in different ways,and the failure mode of the member is affected by the width-thickness ratio of the flange and the web combines with the plate interaction effect.The axial compression ratio and loading direction angle change the failure mode of the member by influencing the distribution form of the cross-section stress.

关 键 词：H形钢构件 双向压弯 破坏机理 板件相关作用 局部屈曲 

分 类 号：TU391[建筑科学—结构工程]