轴心受压开口薄壁构件弹塑性屈曲荷载的统一计算方法

发布时间：2018-06-04 10:48

本文选题：轴心受压构件 + 开口薄壁构件　；参考：《建筑结构学报》2017年05期

【摘要】：通过分析构件截面上应变与轴向力间的关系,以构件轴向应变为基本参数,提出了轴心受压开口薄壁构件的弹塑性屈曲荷载统一计算方法,给出了轴压构件的弯曲屈曲、扭转屈曲、弯扭屈曲等屈曲荷载的弦截法迭代格式,可应用于H形、T形、L形、十形截面等不同开口形式的轴压构件屈曲荷载计算,并可考虑具有残余应力的弹塑性本构关系。该方法以无残余应力的弹性屈曲荷载对应的轴向应变作为初始值,根据不同屈曲形式对应的非线性方程计算弦截区间点的函数值,进行弦截法迭代计算,得到弹塑性构件的临界轴向应变,进而获得屈曲荷载等信息。该方法采用的弦截法收敛速度快、计算量小、无需嵌套循环,可有效解决两端铰接轴心受压开口薄壁构件的弹塑性屈曲快速计算问题,便于工程应用。
[Abstract]:By analyzing the relationship between strain and axial force on the section of members, taking axial strain as basic parameter, a unified calculation method of elastic-plastic buckling load for thin-walled members with axial compression is proposed, and the bending buckling of axially compressed thin-walled members is given. The iterative method of chord section for buckling loads such as torsional and torsional buckling can be applied to the buckling load calculation of H-shaped T-shaped member with L-shape and ten-shape section, and the elastic-plastic constitutive relation with residual stress can be considered. In this method, the axial strain corresponding to the elastic buckling load without residual stress is taken as the initial value, and the function value of the chord section point is calculated according to the nonlinear equations corresponding to different buckling forms. The critical axial strain of elastoplastic member is obtained, and the information of buckling load is obtained. This method has the advantages of fast convergence speed, small computational cost and no nested cycle. It can effectively solve the problem of fast elastic-plastic buckling of thin-walled members with hinged axial compression at both ends, and is easy to be applied in engineering.
【作者单位】：中国电力科学研究院;
【分类号】：TU391

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