冷弯薄壁型钢受弯构件整体弯曲变形直接计算方法研究  

DIRECT CALCULATION METHOD OF OVERALL BENDING DEFLECTION FOR COLD-FORMED STEEL FLEXURAL MEMBERS

作　　者：王海明[1] 张耀春[2] 

机构地区：[1]中国电子工程设计院,北京100840 [2]哈尔滨工业大学土木工程学院,哈尔滨150090

出　　处：《工业建筑》2011年第1期130-135,共6页Industrial Construction

摘　　要：对于冷弯薄壁型钢构件来说,目前的国外设计规范大多采用有效截面法来考虑局部屈曲对构件变形的影响。由于冷弯薄壁型钢构件的板件宽厚比较大,在正常使用阶段除了发生局部屈曲之外还可能发生畸变屈曲,从而影响构件的变形性能。通过探索一种无需求解构件的有效截面特性,利用全截面直接求解受弯构件整体弯曲变形的计算方法(简称"直接变形法"),在已有试验研究的基础上利用有限元程序ANSYS对试验进行模拟,结果表明,模拟结果与试验结果吻合较好。在此基础上,对直卷边、斜卷边和复杂卷边C形截面纯弯构件进行有限元参数分析。参数分析时,对于每个构件都提取了相应于每级荷载时构件的变形状况。通过对各参数及卷边形式的研究综合对比,分析各曲线散点的分布规律,分别建立了不同厚度的直卷边、斜卷边以及复杂卷边构件的直接变形法公式,从而使得构件变形的计算过程大大简化。The effective section method is used for design of cold-formed steel members,in which the effect local buckling on the deflections of members is taken into account in the design codes of most foreign countries.Because the ratio of width to thickness of cold-formed steel members is usually large,besides local buckling,distortional buckling is also occurred during the regular service stage and influences the members’deflection behavior.It was explored a new method which could be used for calculating the overall bending deflection directly by full sectional properties instead of effective sectional properties.This method could be called direct deflection method（DDM）.Based on the existing test results,it was also simulated the tests by the finite element program of ANSYS and the results showed good agreement with the test results.C-section pure bending members with upright,inclined and complex edge stiffeners were selected for finite element parametric analysis.The deflection situations were extracted under every load step for all members.By comparing the scatter points’distribution of every curve for different parameters and edge stiffener members,the DDM formulas for upright,inclined and complex edge stiffener members with different thicknesses were established.And the deflection calculation progress was enormously simplified.

关 键 词：冷弯型钢 直接变形法 畸变屈曲 纯弯 弯曲变形 

分 类 号：TU392.1[建筑科学—结构工程]