结构工程
流离失所(心理学)
地震分析
延展性(地球科学)
谱线
脉搏(音乐)
桥(图论)
分段
断层(地质)
地震学
地质学
工程类
物理
数学
数学分析
电信
天文
心理学
心理治疗师
蠕动
内科学
医学
热力学
探测器
作者
Yifeng Wu,Hao Wang,Jian Li,Ben Sha,Aiqun Li
标识
DOI:10.1193/033017eqs056m
摘要
A variety of research has focused on the inelastic displacement demand of a single degree of freedom (SDOF) system when subjected to near-fault pulse-like ground motions, in which the concerned ductility, μ, is typically lower than ten for normal structures. However, for seismic isolated structures that are more prone to large displacement, the corresponding research is limited. The purpose of this paper is to investigate the inelastic displacement spectra of an SDOF system with μ ranging from 5 to 70 and further proposes a direct displacement-based (DDB) design method for seismic isolated bridges. More concretely, a pool of near-fault pulse-like records is assembled, the mean C μ as a function of T/ T p is developed, and the influences of the ductility, μ, and the post-to-pre-yield ratio, α, on C μ are carefully investigated. Then the corresponding inelastic displacement spectra, S d , are obtained, and a comprehensive piecewise expression is proposed to fit S d . After that, the utilization of the spectra for the DDB design of a three-span seismic isolated continuous bridge is performed, and the principal of simplifying the bridge to an SDOF system is carefully explained and verified.
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