混凝土剪力墙结构考虑高振型影响的基于位移的抗震设计  

Displacement based seismic design method of shear wall structures considering higher mode effect

作　　者：辛力[1] 梁兴文[2] 曾凡生[1] 王敏[1] 

机构地区：[1]中国建筑西北设计研究院有限公司,陕西西安710003 [2]西安建筑科技大学土木工程学院,陕西西安710055

出　　处：《建筑结构学报》2010年第9期27-34,共8页Journal of Building Structures

基　　金：高等学校博士学科点专项科研基金项目(20070703002)

摘　　要：针对因混凝土剪力墙设计方案选取不当引起的能力曲线在弹性阶段高于或低于需求曲线的情况,由混凝土剪力墙结构各性能水平的目标位移导出相应的目标周期,以结构弹性基本自振周期小于或等于目标周期确定墙肢的截面厚度,使混凝土剪力墙的能力曲线与需求曲线在弹性阶段基本重合,抗震能力基本等于抗震需求。同时,针对因结构设计承载力过高或过低而引起的能力曲线在弹塑性阶段高于或低于需求曲线的情况,对高性能混凝土剪力墙超强系数取值做了探讨,将结构各性能水平地震需求的最大值除以超强系数得到混凝土剪力墙的设计地震作用,并以此为依据进行承载力设计,确保混凝土剪力墙结构满足各性能水平的承载力需求。算例分析表明,该方法能够保证混凝土剪力墙结构满足各性能水平的承载力需求。The Direct Displacement-based Seismic Design（DDBSD） method of shear wall structures considering higher mode effect is provided.The problem that the capacity curve is higher or lower than the demand curve caused by the unreasonable structural scheme is investigated.In elastic stage,the target period of shear wall structures is derived by its target displacement,the method that the natural periods should be smaller than or equal to corresponding target periods is used to select the section rigidity of shear walls.This can ensure that the capacity curve in elastic range is in agreement with the demand curve,and the seismic capacity essentially equals to the seismic demand.In inelastic stage,the over-strength coefficient of concrete shear walls designed by Chinese code which is defined as the ratio of actual bearing capacity to design bearing capacity is discussed,and the bearing capacity demand divided by over-strength coefficient equals to the design bearing capacity which ensures the structure meeting its performance objective in inelastic stage.The paper illustrates the application of the proposed procedures with an example to demonstrate the feasibility.

关 键 词：混凝土剪力墙结构 基于位移的抗震设计 高阶振型效应 能力曲线 需求曲线 目标周期 超强系数 

分 类 号：TU973.16[建筑科学—结构工程] TU352.11