冷弯薄壁槽钢轴压屈曲承载力设计方法比较  

Comparison of design methods for axially buckling loads of cold-formed thin-walled channels

作　　者：黄丽华 杨文斌 徐嘉 HUANG Lihua;YANG Wenbin;XU Jia(Faculty of Infrastructure Engineering,Dalian University of Technology,Dalian 116024,China)

机构地区：[1]大连理工大学建设工程学部,辽宁大连116024

出　　处：《西安建筑科技大学学报（自然科学版）》2020年第2期177-183,共7页Journal of Xi'an University of Architecture & Technology(Natural Science Edition)

基　　金：国家自然科学基金项目面上项目(51678115)。

摘　　要：在各国轻钢结构设计规范中,冷弯薄壁型钢轴压承载力的计算主要基于有效宽度法和直接强度法.本文通过研究美国钢铁协会(AISI)规范和中国冷弯钢规范(GB 50018—2014征求意见稿)中有效宽度法和直接强度法的计算公式,以76根常规槽形截面试验杆件为对象,对比基于不同计算方法得到的轴压承载力,分析两国规范中基于两种算法计算结果的精度、可靠性和差异性.计算结果表明:中国规范(意见稿)的直接强度法和美国规范的有效宽度法计算结果和试件试验承载力更接近,中国规范(意见稿)的有效宽度法的计算结果偏保守,而美国规范的直接强度法计算的承载力偏危险且离散性最大.In the light steel structure design codes of various countries,the calculation of the axially buckling loads of cold-formed thin-walled steel members is mainly based on the effective width method and direct strength method.In this paper,through the study of the formulas in American Iron and Steel Institute(AISI)and the Chinese Cold-formed Steel Specification(GB 50018—2014 draft),76 specimens of regular channel sections are taken as the objects,the comparison of axially buckling loads obtained from the different calculation methods with the experiment results was conducted.The accuracy,reliability and the differences of calculation results based on the algorithms in the two countries’specifications are analyzed.Results show that the calculation results of the direct strength method in the Chinese code(draft)and the effective width method in the American code are closer to the bearing capacity of the specimens.The calculation results of the effective width method in the Chinese code(draft)are conservative,while the calculation results of the direct strength method in the American code are dangerous and discrete.

关 键 词：冷弯薄壁型钢 轴压承载力 有效宽度法 直接强度法 槽形截面 

分 类 号：TU392.1[建筑科学—结构工程]