Direct estimation of seismic response in reduced-degree-of-freedom isolation and energy dissipation systems

被引:3
|
作者
Gkatzogias, Konstantinos I. [1 ]
Kappos, Andreas J. [1 ,2 ]
机构
[1] City Univ London, Civil Engn Dept, Res Ctr Civil Engn Struct, London, England
[2] Aristotle Univ Thessaloniki, Civil Engn Dept, Thessaloniki, Greece
来源
EARTHQUAKE ENGINEERING & STRUCTURAL DYNAMICS | 2019年 / 48卷 / 10期
关键词
bridges; Eurocode; 8; nonlinear dynamic analysis; seismic isolation; unidirectional/bidirectional excitation; viscous dampers; EQUIVALENT LINEAR-ANALYSIS; LATERAL FORCE PROCEDURE; ISOLATED BRIDGES; DISPLACEMENT; SPECTRA; DESIGN;
D O I
10.1002/eqe.3169
中图分类号
TU [建筑科学];
学科分类号
0813 ;
摘要
A methodology for the development of design tools for direct estimation of peak inelastic response in reduced-degree-of-freedom (RDOF) isolation and energy dissipation systems is presented. The suggested procedure is an extension of an earlier method addressing purely hysteretic isolation systems. Herein, the dynamic equation of motion is first normalised to reduce the number of design parameters that significantly affect the response. The sensitivity of normalised response quantities to the amplitude of the ground motion is then investigated through extensive parametric nonlinear dynamic analyses of isolated single-degree-of-freedom (SDOF) systems with linear viscous damping using code-based target spectra. Regression analysis is subsequently employed to develop generalised design equations (GDEs) suitable for design. Further investigations are made to address nonlinear viscous damping and the effect of the transverse component of seismic action in two-degree-of freedom (2DOF) systems under bidirectional excitation, making the procedure applicable to common bridge isolation schemes. GDEs constitute an alternative to equivalent linearisation approaches commonly adopted by codes, informing the selection among alternative isolation and energy dissipations schemes without requiring iterative analysis. The approach is incorporated in the Deformation-Based Design methodology for seismically isolated bridges in a forthcoming paper.
引用
收藏
页码:1112 / 1133
页数:22
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