不锈钢工字形截面轴心受压构件整体稳定性能有限元研究  

FEA OF THE OVERALL STABILITY FOR I-SECTION STAINLESS STEEL MEMBER UNDER AXIAL COMPRESSION

作　　者：尚帆[1] 杨璐[1] 赵梦晗[1] 徐东辰 张勇[2] 

机构地区：[1]北京工业大学建筑工程学院,北京100124 [2]北京交通大学土木建筑工程学院,北京100044

出　　处：《工程力学》2016年第3期112-119,共8页Engineering Mechanics

基　　金：国家自然科学基金项目(51108007);中国博士后科学基金面上项目(2013M530500)

摘　　要：该文采用通用有限元软件ANSYS对奥氏体和双相体两种不锈钢材料的不锈钢工字形截面轴心受压构件的整体稳定性能试验进行了数值模拟。在建立有限元模型的过程中考虑了材料的非线性本构模型、构件的初始几何缺陷、残余应力,并分别对工字形构件绕强轴失稳与绕弱轴失稳形式进行了分析。通过有限元模拟得到的极限承载力、试验测量的极限承载力以及规范计算的极限承载力进行对比可知:该文的有限元方法能够准确模拟不锈钢轴心受压构件的受力情况;同时,对于工字形构件,残余应力对绕弱轴失稳构件的稳定承载力的影响较大;此外,GB50017-2003不适用于不锈钢整体稳定性设计。The finite element software ANSYS was used to perform numerical experiments for the overall stability of I-section austenitic and duplex stainless steel members under axial compression. The nonlinear constitutive material model, the initial geometric imperfection and residual stress distribution were accounted for in the established finite element model, and with which the buckling behaviors with respect to both the major axis and the minor axis were analyzed respectively. Comparison was made among the ultimate bearing capacity by the finite element model, that obtained experimentally and that according to specifications, which indicates that the finite element model can accurately simulate mechanical performance of stainless steel member under axial compression; the impact of residual stress on ultimate bearing capacity is remarkable in the case of bucking with respect to minor axis being evident; and GB50017-2003 is not applicable to the overall stability calculation of the stainless members.

关 键 词：不锈钢 工字形 整体稳定性 轴心受压 有限元模型 

分 类 号：TU391[建筑科学—结构工程]