预应力预制混凝土剪力墙结构直接基于位移的抗震设计方法及应用

DIRECT DISPLACEMENT-BASED ASEISMIC DESIGN AND APPLICATION FOR PRESTRESSED PRECAST CONCRETE SHEAR-WALL STRUCTURES

该文提出一种采用弹塑性位移谱的直接基于位移的抗震设计方法,对预应力预制混凝土剪力墙结构进行设计,依据初步设计的结构几何参数得到结构的屈服位移,根据大震作用下的设计目标位移,计算相应的延性系数,通过弹塑性位移谱获得结构的周期,从而得到基底剪力,根据基底剪力和倾覆弯矩对剪力墙截面进行设计。然后针对通过该方法设计的4种不同层高的预应力预制剪力墙结构,使用有限元分析软件OpenSees对结构进行弹塑性时程分析,分析结果表明通过直接基于位移的设计实现了预应力预制剪力墙结构的预期抗震性能目标。

A simple procedure of direct displacement-based design based on the concept of inelastic design spectra is developed. It is assumed that the yielding displacement depends on the structural geometry and the design ductility factors are calculated according to different limit states. The initial period of structures is based on inelastic displacement spectra, and then the base shear and overturning moment are obtained. Section design is carried out according to overturning moment. The new design procedure is then applied to a set of case study structures and validated through nonlinear dynamic analyses using OpenSees. Nonlinear time history analyses verify that this approach is applicable to control the target displacement to the performance acceptable limit.