【摘要】 框支密肋壁板结构是由底部框架-抗震墙和上部密肋壁板组成的新型结构体系。以实例原型结构为基础提出了8种方案。采用有限元分析软件IDARC 2D 6.1对其进行了水平地震作用下的非线性动力时程分析。分析了框支层的刚度对结构的动力特性和地震反应的影响,以及多层框支密肋壁板结构第二层与底层刚度比的取值问题。以底层最大层间位移角为控制参数,探讨了底层抗震墙数量的合理取值,提出了多层框支密肋壁板结构抗震设计底层抗震墙数量的初估值:底层结构截面面积(抗震墙截面面积加柱截面面积)与楼面面积的比值的范围为4%~6%;抗震墙截面面积与楼面面积的比值的范围为2%~4%,可为该类建筑工程抗震设计提供参考。更多还原

【Abstract】 Frame-supported multi-ribbed slab structure(FSMRSS) is a new type of structure composed of bottom frame-seismic walls and upper multi-ribbed composite walls.In this paper,the nonlinear dynamic time-history analysis of the FSMRSS under horizontal earthquake has been carried out by IDARC2D6.1.The FSMRSS model is established in which the multi-ribbed composite slab is modeled by equivalent shear wall element,the bottom frame and upper concealed outer frame are modeled by beam and column elements with retrogressive three-linear resilience model.The stiffness and strength degradation and slip pinching are also considered using hysteretic model with degrading control parameters.The fundamental vibration characteristics as well as the maximum interstorey drifts of 8 typical numerical cases of FSMRSS under El-Centro earthquake wave are calculated.The influence of the bottom story stiffness on seismic responses of FSMRSS is discussed.The rational stiffness ratio of the second floor to the first floor is investigated.Taking the interstorey drift of the bottom story as the control parameter,the amount of seismic walls at the bottom story is carefully studied.The preliminary amount of seismic walls is proposed for initial seismic engineering design: the cross sectional area of the bottom story,which includes the area of seismic walls and the area of frame columns,is approximately 4%-6% of the overall area of the bottom story,while the area of seismic walls is approximately 2%-4% of the overall bottom story area.更多还原