Seismic resistant design of highway bridge with multiple-variable frequency pendulum isolator

IF 2.1 3区 工程技术 Q2 ENGINEERING, CIVIL
Liangde Xu, Wen Jianian, Q. Han, Du Xiuli
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引用次数: 0

Abstract

Multiple variable frequency pendulum isolator (MVFPI) has been recently developed as a superior alternative to the traditional friction pendulum bearing (FPB) especially for the seismic isolation in near-fault regions. The MVFPI is characterized by its variable frequency and self-adaptability, which are achieved by piecewise function of sliding surface and shape memory alloy (SMA). The objective of this study is to propose the design algorithm of the MVFPIs in highway bridge as an extension of the direct displacement-based design (DDBD) framework. The nonlinearities of the structural components are taken into account in the design procedure, and the corresponding damage states satisfy the two-stage design philosophy. The accuracy and robustness of the design procedure are verified by an isolated four-span highway bridge through nonlinear time history (NLTH) analyses. The analytical results indicate that the proposed design procedure can predict the profile of deck displacement and amplitude, as well as the damage states of the piers. From statistic aspect, the fragility analyses illustrate that the bridge isolated by MVFPIs exhibits better seismic performance than that of the bridge isolated by FPBs.
公路桥梁多变频摆隔振器的抗震设计
多变频摆隔震器(MVFPI)是近年来发展起来的一种替代传统摩擦摆轴承(FPB)的新型隔震装置,尤其适用于近断裂带的隔震。MVFPI的特点是通过滑动表面的分段函数和形状记忆合金(SMA)来实现频率的变化和自适应。本研究的目的是提出公路桥梁mvfpi的设计算法,作为直接基于位移的设计(DDBD)框架的扩展。在设计过程中考虑了结构构件的非线性,相应的损伤状态满足两阶段设计原则。通过对一座孤立四跨公路桥梁的非线性时程分析,验证了设计方法的准确性和鲁棒性。分析结果表明,所提出的设计方法可以预测桥面位移和振幅的分布,以及桥墩的损伤状态。从易损性分析的统计角度来看,mvffi隔震桥梁的抗震性能优于FPBs隔震桥梁。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
Smart Structures and Systems
Smart Structures and Systems 工程技术-工程:机械
CiteScore
6.50
自引率
8.60%
发文量
0
审稿时长
9 months
期刊介绍: An International Journal of Mechatronics, Sensors, Monitoring, Control, Diagnosis, and Management airns at providing a major publication channel for researchers in the general area of smart structures and systems. Typical subjects considered by the journal include: Sensors/Actuators(Materials/devices/ informatics/networking) Structural Health Monitoring and Control Diagnosis/Prognosis Life Cycle Engineering(planning/design/ maintenance/renewal) and related areas.
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