Seismic behavior of precast segmental column bridges under near-fault forward-directivity ground motions  

作　　者：Xin Lifeng Li Xiaozhen Fu Peiyao Mu Di 

机构地区：[1]School of Mechanics,Civil Engineering&Architecture,Northwestern Polytechnical University,Xi′an 710072,China [2]Department of Bridge Engineering,Southwest Jiaotong University,Chengdu 610031,China [3]Department of Civil and Environmental Engineering,Hanyang University,Seoul 04763,Korea

出　　处：《Earthquake Engineering and Engineering Vibration》2022年第2期559-571,共13页地震工程与工程振动（英文刊）

基　　金：National Natural Science Foundation of China under Grant Nos.U1434205 and 51678490;the Major Research Plan of China National Railway Ministry of China under Grant Nos.2015G002-B and P2018G007;the National Key R&D Program of China under Grant No.2017YFC1500803。

摘　　要：Precast segmental column bridges exhibit various construction advantages in comparison to traditional monolithic column bridges.However,the lack of cognitions on seismic behaviors has seriously restricted their applications and developments.In this paper,comprehensive investigations are conducted to analyze the dynamic characteristics of precast segmental column bridges under near-fault,forward-directivity ground motions.First,the finite-element models of two comparable bridges with precast segmental columns and monolithic columns are constructed by using OpenSees software,and the nonlinearities of the bridges are considered.Next,three different earthquake loadings are meticulously set up to handle engineering problems,namely recorded near-and far-field ground motions,parameterized pulses,and pulse and residual components extracted from real records.Finally,based on the models and earthquake sets,extensive explorations are carried out.The results show that near-fault forward-directivity ground motions are more threatening than far-field ones;precast segmental column bridges may suffer more pounding impacts than monolithic bridges;the“narrow band”effect caused by near-fault,forward-directivity ground motions may occur in bridges with shorter periods than pulse periods;and pulse and residual components play different roles in seismic responses.

关 键 词：precast segmental column bridge monolithic column bridge seismic behavior near-fault forward-directivity ground motion pounding effect 

分 类 号：U442.55[建筑科学—桥梁与隧道工程]