短肢剪力墙结构体系的动力特性分析

Dynamic Characteristic Analysis of Short Pier Shear Wall Structures

应用三维有限元模型,通过对一幢12层短肢剪力墙结构的动力分析,研究并比较了短肢剪力墙结构体系与普通剪力墙结构体系的动力特性。结果表明,与普通剪力墙结构体系相比,短肢剪力墙结构体系抗侧刚度较小,基本周期较长,加速度反应和层间剪力都比较小,这对结构抗震是有利的。此外,本文还将短肢剪力墙在水平载荷作用下的侧移曲线反弯点的相对高度作为此类结构整体性和墙肢相对强弱的综合评价指标,设计中应使反弯点的相对高度不小于0.4。

Elastic dynamic characteristic of a 12-storyed building with short pier shear walls is analyzed by a 3-D finite element model. Dynamic characteristics of the buildings with short pier shear walls and normal shear walls are studied. Results indicate that compared with the normal shear wall structure, the short pier shear wall structure has characteristics of smaller lateral stiffness, longer duration of the basic mode, less response in acceleration, and smaller story shear force under horizontal seismic action. In additional, the relative height of the contra-flexure point of lateral displacement curve on the short pier shear wall structure is proposed as a comprehensive index to estimate the integration and the relative strength of structure piers. The relative height of the point is greater than 0.4 in the design of short pier shear wall structures.