交叉加劲钢板深梁弹性屈曲分析

摘要

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 . T he results show that critical buckling load increases w hen bending stiffness ratio increases , but the increment sharply decreases w hile bending stiffness ratio is equal to threshold stiffness ratio w hich is about 10 . T he critical buckling load decreases w hen span‐depth ratio and thickness of plate decrease . T he equivalent buckling coefficient increases w hen thickness of the plate decreases .T he 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 .%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。