交叉加劲钢板深梁弹性屈曲分析  

Elastic Buckling Analysis on Steel Plate Deep Beam with Diagonal Stiffeners

作　　者：江力强 郑宏[2] 赵鹏[2] 袁晓洒[2] 

机构地区：[1]东南大学土木工程学院,江苏南京210096 [2]长安大学建筑工程学院,陕西西安710061

出　　处：《建筑科学与工程学报》2015年第4期80-85,共6页Journal of Architecture and Civil Engineering

基　　金：国家自然科学基金项目(50678025);陕西省留学人员科技活动择优资助项目(SLZ2008008);中央高校基本科研业务费专项资金项目(CHD2012TD012)

摘　　要：以交叉加劲钢板深梁为研究对象,利用有限元软件ANSYS分析其弹性屈曲性能,讨论了抗弯刚度比、跨高比、钢板深梁厚度对其弹性屈曲性能的影响;考虑钢板深梁在钢框架的弯剪受力特性,根据板的经典理论建立了交叉加劲钢板深梁屈曲荷载计算公式,提出了等效屈曲系数。结果表明:交叉加劲钢板深梁的临界屈曲荷载随抗弯刚度比增大而增大,但达到门槛刚度比后,增大幅度急剧减小,得到门槛刚度比约为10;临界屈曲荷载随跨高比和板厚的减小而减小,等效屈曲系数随板厚减小而增大;等效屈曲系数与跨高比关系曲线由二次抛物线形向波浪形渐变,交叉加劲钢板深梁受力特性由剪切主导向弯曲主导过渡。The elastic buckling behavior of steel plate deep beam with diagonal stiffeners was studied using finite element analysis software ANSYS. The influences of bending stiffness ratio, span-depth ratio, thickness of steel plate deep beam on elastic buckling were discussed; Considering bending shear stress characteristic of steel plate deep beam in steel frame, the calculation formula for buckling load of steel plate deep beam with diagonal stiffeners was introduced by using the classic theory of plate and equivalent buckling coefficient. The results show that critical buckling load increases when bending stiffness ratio increases, but the increment sharply decreases while bending stiffness ratio is equal to threshold stiffness ratio which is about 10. The critical buckling load decreases when span-depth ratio and thickness of plate decrease. The equivalent buckling coefficient increases when thickness of the plate decreases. The curves of equivalent buckling coefficient and span-depth ratio change from shape of second-degree parabola to wave of gradient when thickness of plate decreases. It means that the mechanical properties of steel plate deep beam with diagonal stiffeners are from shear to bend.

关 键 词：交叉加劲 钢板深梁 屈曲荷载 门槛刚度比 等效屈曲系数 

分 类 号：TU375.1[建筑科学—结构工程]