Controlled rocking pile foundation system with replaceable bar fuses for seismic resilience  

作　　者：Cheng Zhao Li Shuai Wang Jingquan 

机构地区：[1]Bridge Engineering Research Center of Southeast University,School of Civil Engineering,Southeast University,Nanjing 210096,China

出　　处：《Earthquake Engineering and Engineering Vibration》2022年第3期683-696,共14页地震工程与工程振动（英文刊）

基　　金：Supported by:National Natural Science Foundation of China under Grant Nos.52008092,U1934205,51908123;the China Postdoctoral Science Foundation under Grant No.2021M690034;the International Postdoctoral Exchange Fellowship Program of China;the Zhishan Postdoctoral Fellowship Program。

摘　　要：Bridges designed following a conventional approach minimize the risk of collapse,but often require challenging,costly,and time-consuming restoration after an earthquake occurs.The new seismic design philosophy requires bridges to maintain functionality even after severe earthquakes.In this context,this paper proposes a controlled rocking pile foundation(CRPF)system and numerically evaluates bridges′degree of seismic resilience.The CRPF system allows a pile cap to rock on a pile foundation and dissipate seismic energy through inelastic deformations of replaceable bar fuses that connect a pile cap and piles.Following the conceptual design of the CRPF system,two analytical models were developed for a bridge pier utilizing the CRPF system and a pier designed to develop a plastic hinge in its column.The analytical results indicate that,after experiencing a severe earthquake,a conventionally designed bridge pier sustained substantial damage in its column and exhibited significant residual displacement.In contrast,a pier using the CRPF system showed negligible residual displacement and maintained elastic behavior except,as expected,for bar fuses.The damaged fuses can be rapidly replaced to recover bridge seismic resistance following an earthquake.Therefore,the CRPF system helps to achieve the desired postearthquake performance objectives.

关 键 词：seismic resilience bridges pier controlled rocking pile foundation repairable bar fuse 

分 类 号：U442.55[建筑科学—桥梁与隧道工程] U443.22[交通运输工程—道路与铁道工程]