以位移为基础的钢筋混凝土桥梁墩柱抗震设计方法  

Displacement-based seismic design method for RC bridge columns

作　　者：弓俊青[1] 朱晞[1] 

机构地区：[1]北方交通大学土木建筑工程学院,北京100044

出　　处：《中国公路学报》2001年第4期42-46,共5页China Journal of Highway and Transport

基　　金：国家自然科学基金项目 ( 5 99780 0 1)

摘　　要：提出一种改进的以位移为基础的抗震设计方法 ;将结构位移和延性作为设计目标 ,用结构的弹性刚度作为等效刚度 ,在计及延性的非线性位移设计谱基础上进行钢筋混凝土墩柱的非线性抗震设计 ,设计过程不需要迭代 ,且能够实现期望的设计目标延性。通过对位移设计谱的讨论 ,并与文献 [4]的设计方法进行了比较。最后以桥梁墩柱为例 ,给出了这种方法的完整设计过程 。An improved displacement based seismic design method for concrete bridge columns that uses the constant ductility design spectrum is developed.The displacement and ductility of structure are defined as the design targets.This method estimates the effective period of inelastic SDOF system consistent with the selected inelastic design spectrum.The elastic stiffness of structure is the effective stiffness of displacement based seismic design.The objective ductility of structure could be realized directly while retaining the attraction of displacement based seismic design procedure.There is no iteration in design procedure.The constant ductility demand for inelastic systems in the improved procedure versus the elastic demand developed by KOWALSKY et al(1995) for equivalent linear systems.Such a procedure of displacement based seismic design based on inelastic displacement design spectrum relating the ductility factor,μ,for different period,T,ranges,has been presented.Some design results are illustrated and discussed by example.

关 键 词：桥梁 抗震设计 等效刚度 钢筋混凝土 墩柱 位移设计谱 

分 类 号：U442.55[建筑科学—桥梁与隧道工程] U448.34[交通运输工程—道路与铁道工程]