钢板剪力墙任意布置单侧加劲肋的等效刚度

EQUIVALENT RIGIDITY OF ONE-SIDE STIFFENERS PLACED IN ARBITRARY POSITION OF STEEL SHEAR WALL

对任意布置纵向单侧加劲肋的钢板剪力墙单向轴压下的屈曲性能进行研究。采用隔离体分析法,把加劲肋和被加劲钢板离散成独立个体进行受力分析,考虑加劲肋扭转和剪切变形的影响,同时加劲肋和钢板在连接线处需满足变形协调条件,求得单侧加劲板单向轴压下的屈曲临界方程,对比双面对称加劲板的屈曲临界方程,获得单侧加劲肋等效为双面对称加劲肋的等效抗弯刚度和等效抗扭刚度的解析表达式,进而获得被加劲板参与加劲肋工作的有效宽度表达式。与有限元模拟结果进行分析比对表明,公式具有良好精度,适用于任意开口和闭口截面的单侧加劲肋板。通过单侧加劲肋的等效刚度表达式,可以把单侧加劲问题转化为双侧加劲问题。

It was analyzed the buckling of plates with one-side stiffener in arbitrary position under uniform compression. Analyses were carried out for the isolated stiffener and the plate acted by their interactive forces, and they are combined to satisfy the continuity conditions in the longitudinal strains and the deflections on the connecting line, the effect of the free and warping torsion and the shear deformation in the stiffener were included. The equation ofbuckling was thus obtained. Comparing the buckling equation of plate with double sided stiffener, analytic expression of effective bending stiffness and twisting stiffness of the one-side stiffener was obtained, the effective width of the plate taking part in the function of the stiffener was found. Comparing with the results of ANSYS analysis, it was found that the analytic solution had excellent accuracy regardless of the shape of the stiffener. Using the effective rigidities, the one-side stiffened plates could be analyzed as if it was a double side stiffened plate.