安装形状记忆合金减震系统的斜拉桥地震响应分析  

Seismic response analysis of a cable-stayed bridge with shape memory alloy seismic mitigation systems

作　　者：王晓冬 范金国 王宇霄 郑越 姜宇飞 WANG Xiaodong;FAN Jinguo;WANG Yuxiao;ZHENG Yue;JIANG Yufei(Highway Maintenance Service Center of Qinhuangdao City,Qinhuangdao 066000,China;Rizhao Branch of Shandong Expressway Development Group Co.,Ltd.,Rizhao 276800,China;College of Civil Engineering,Tongji University,Shanghai 200092,China)

机构地区：[1]秦皇岛市公路养护服务中心,河北秦皇岛066000 [2]山东高速发展有限公司日照公司,山东日照276800 [3]同济大学土木工程学院,上海杨浦200092

出　　处：《地震工程与工程振动》2024年第4期157-168,共12页Earthquake Engineering and Engineering Dynamics

基　　金：科技援青合作专项(2024-QY-202);国家自然科学基金项目(51978513)。

摘　　要：形状记忆合金(shape memory alloys,SMA)具有超弹性效应和形状记忆效应,被逐步应用于土木工程领域。基于SMA材料的超弹性能,提出一种减震限位装置。将该装置通过销轴分别与桥梁的上、下部结构相连,使其在水平方向发挥限位减震的作用,保护桥梁结构在地震作用下免遭破坏。首先通过进行SMA单索和减震限位装置的拟静力荷载试验,得到SMA拉索和减震限位装置的本构关系模型;随后选择一座主跨为360 m的斜拉桥,在OpenSeesPy软件中建立有限元模型,分别将采用0、5、10、15、20、30、40、50根SMA拉索的减震限位装置添加到斜拉桥模型,选取了7条远场和7条近场脉冲地震动进行了斜拉桥的地震响应分析。研究结果表明,随着SMA拉索数量的增加,斜拉桥主梁最大位移依次减小,但主塔塔底最大曲率依次增加。当采用10根SMA拉索时,在远场和近场脉冲地震动作用下,主梁平均最大位移分别减小了51.8%和36.8%,塔底平均最大曲率分别增加了5.1%和16.0%,因此,可以通过增加较小主塔曲率的方法实现主梁位移的大幅度降低。Shape memory alloys(SMA)have the characteristic of superelasticity and shape memory property,and are increasingly applied to civil engineering.A novel SMA-based device is proposed,which has the seismic mitigation and displacement limiting capacities.The device connects with the superstructure and substructure of the bridge through axis pins.The novel device not only can restrain the bridge in a safe range,but also can dissipate the seismic energy,and protect the bridge from earthquake damage.This study comments with pseudo-static tests on a single SMA cable specimen and the novel device.The constitutive models of the SMA cable and the novice device are proposed based the test results.A finite element model of a cable-stayed bridge with a main span of 360 meters was established in OpenSeesPy software for investigation.Seven far-field and seven near-field earthquake records were selected to study the seismic responses of the cable-stayed bridge with the novel device equipping 0,5,10,15,20,30,40,50 SMA cables.The study results indicate that the maximum longitudinal displacement of the girder decreased significantly with the number of SMA cables increased.However,this reduction was accompanied by a slight increase in the average maximum curvature at the base of the main tower.For example,the seismic mitigation device with 10 SMA cables reduced the average maximum displacement of the girder by 51.8%and 36.8%under seven far-field and seven near-field earthquakes,respectively.However,the corresponding average maximum curvature at the tower base increased by 5.1%and 16.0%,respectively.Consequently,the proposed SMA-based seismic mitigation device can effectively reduce the displacement of the girder at the cost of a small curvature increment at the tower base.

关 键 词：桥梁抗震 动力分析 形状记忆合金 减震限位装置 

分 类 号：U44[建筑科学—桥梁与隧道工程]