竖向荷载下平面内受力楼板的分析与设计

Analysis and Design of Floor Slabs Subjected to In-plane Forces under Vertical Loading

楼板是结构抗侧力体系的重要组成部分,其平面内刚度改变对水平力分配影响较大。在一些结构中,楼板在竖向荷载下承受平面内拉力,可能开裂并对其平面内刚度产生显著影响。利用有限元软件,对斜柱、悬挑桁架与搭接柱等竖向荷载作用下平面内受力的楼板进行了分析。提出了竖向荷载下平面内受力楼板承载力设计原则,给出了考虑裂缝宽度的楼板开裂后刚度折减系数与刚度不足时的应对措施。

Slab is a critical component of the lateral force resisting system. The change of slab＇ s in-plane stiffness may result in significant change in lateral force distribution. In certain structures, slabs are subjected to in-plane forces under vertical loading, which may cause concrete crack and stiffness regression. Based on FEM software, the mechanical behaviors of floor slabs connected with sloping columns, cantilevered trusses and lapping columns are analyzed. The principles in load-bearing capacity design, methods to evaluate the stiffness considering crack width and countermeasures for insufficient rigidity are proposed.