高强钢薄壁箱形截面压弯构件极限承载力研究  

RESEARCH ON THE ULTIMATE BEARING CAPACITY OF THIN-WALLED BOX-SECTION COLUMNS USING HIGH-STRENGTH STEEL UNDER BENDING AND AXIAL COMPRESSION

作　　者：高磊[1] 江克斌[1] 白林越 

机构地区：[1]中国人民解放军理工大学野战工程学院,南京210007

出　　处：《钢结构》2016年第11期47-51,72,共6页Steel Construction

基　　金：国家重点基础研究发展计划(973计划)项目(2014CB046801)

摘　　要：利用数值模拟方法分析了18Mn2Cr Mo BA高强钢薄壁箱形截面(由槽形钢板对焊而成)压弯构件的极限承载力,研究了长细比、翼缘宽厚比、截面边长比3个参数对薄壁箱形截面构件极限承载力的影响。在数值模拟计算和对轴心受力、受弯构件研究的基础上,提出了适用于18Mn2Cr Mo BA高强钢薄壁箱形截面压弯构件极限承载力的计算方法。研究结果表明:随着长细比的增大,弯矩-轴力相关曲线由上凸变为下凹,翼缘宽厚比、截面边长的增大都会降低构件极限承载力,各参数之间相互影响。提出的建议计算方法与有限元计算结果符合较好。The ultimate bearing capacity of thin-walled box-section columns which was welded by channel steel using18Mn2 Cr Mo BA high strength steel under bending and axial compression was studied by finite element method. The effect of slenderness ratio,flange width-to-thickness ratio and section side ratio on the ultimate bearing capacity of thin-walled boxsection was studied. Based on many numerical calculation results and the researches on axial compression columns and pure-bending columns,the calculation methods were proposed to predict the ultimate bearing capacity of thin-walled boxsection columns using high strength steel under bending and axial compression. The results showed that the moment and press correlation curves changed upward convexity to downward concave with the increasing of slenderness ratio,the ultimate bearing capacity decreased with the flange width-to-thickness ratio and section side ratio increased,the effects of these parameters were interactional. The proposed calculation methods were in good agreement with the finite element numerical results.

关 键 词：高强钢 薄壁箱形截面构件 极限承载力 弯矩-轴力相关曲线 

分 类 号：TU392.1[建筑科学—结构工程]