多跨连续梁拱组合体系桥高墩地震易损性分析  

Analysis on Seismic Vulnerability of High Piers of Multi-span Continuous Beam-arch Composite System Bridge

作　　者：赵堃[1] 付旺旺 史国良 刘冠华 ZHAO Kun;FU Wang-wang;SHI Guo-liang;LIU Guan-hua(Xi’an Municipal Design Research Institute Co.,Ltd.,Xi’an Shaanxi 710068,China;Tianshui Normal University,Tianshui Gansu 741001,China;School of Highway,Chang’an University,Xi’an Shaanxi 710064,China;Qinghai Provincial Department of Transport,Xining Qinghai 810008,China;Urban Investment Operation Co.,Ltd.,China Construction Third Engineering Bureau,Wuhan Hubei 430223,China)

机构地区：[1]西安市政设计研究院有限公司,陕西西安710068 [2]天水师范学院,甘肃天水741001 [3]长安大学公路学院,陕西西安710064 [4]青海省交通运输厅,青海西宁810008 [5]中建三局城市投资运营有限公司,湖北武汉430223

出　　处：《公路交通科技》2023年第2期101-109,共9页Journal of Highway and Transportation Research and Development

摘　　要：为了分析梁拱组合体系桥梁高墩在地震作用下的易损性,以某连续梁拱组合体系桥为工程实例,基于SAP2000有限元软件建立了模型,进行了初步受力分析,确定了受力最不利的固定墩研究对象,并采用增量动力分析法(IDA)分析了研究对象在纵向和竖向地震作用下的结构响应,采用线性回归分析方法得到了地震动参数与损伤指标之间的方程关系,以控制截面的特征曲率和位移延性比的临界值作为损伤指标,绘制出了固定墩的易损性曲线。结果表明:位移散点均匀分布在拟合方程的直线两侧,拟合效果良好;当地震动加速度较小时,桥墩发生轻微和中等损伤的概率随着谱加速度的增大而迅速增大,而发生严重损伤和完全破坏的超越概率增长缓慢,当地震动加速度较大时,发生轻微和中等损伤的概率增长缓慢,而严重损伤和完全破坏的概率增长迅速;在同一等级的不同地震波作用下,桥墩发生轻微和中等损伤的概率远大于发生严重破坏和完全破坏的概率,发生完全破坏的概率很小;当谱加速度为该桥所在场地地震动加速度峰值0.104g时,该桥固定墩发生轻微损伤的概率不足25%,发生中等损伤的概率不足13%,发生严重损伤的概率很小,发生完全损伤的概率为0,可见该桥抗震性能良好;采用增量动力分析法分析桥梁地震易损性,可得到结构在不同等级地震波作用下发生不同程度损伤的概率。In order to analyze the vulnerability of high piers of beam-arch composite system bridge under earthquake,taking a continuous beam-arch composite system bridge for engineering example,a model is established by using the finite element software SAP2000.The preliminary force analysis is carried out and the most unfavorable fixed pier is determined as the research object.Its structural response under the longitudinal and vertical seismic action is analyzed by using the incremental dynamic analysis(IDA)method.The relationship between seismic parameters and damage indicator is obtained by linear regression analysis.Taking the characteristic curvature of the control section and the critical value of the displacement ductility ratio of the pier as the damage indicators,the vulnerability curve of fixed pier is drawn.The result shows that(1)The displacement scatter points are evenly distributed on both sides of the straight line of the fitting equation,and the fitting effect is good.(2)When the seismic acceleration is small,the probabilities of minor and medium damages increase rapidly with the increase of spectral acceleration,while the exceeding probabilities of severe damage and complete damage increase slowly.When the seismic acceleration is large,the probabilities of slight and medium damages increase slowly,while the probabilities of serious damage and complete failure increase rapidly.(3)Under the same level of earthquake waves,the probabilities of slight and medium damages are much greater than those of serious and complete damages,and the probability of complete damage is very small.(4)When the spectral acceleration is the peak seismic acceleration 0.104g of the site where the bridge is located,the probability of slight damage of the fixed pier of the bridge is less than 25%,the probability of medium damage is less than 13%,the probability of serious damage is very small,and the probability of complete damage is 0,so it can be seen that the seismic performance of the bridge is good.(5)The probabilities of differe

关 键 词：桥梁工程 地震易损性 增量动力分析法 梁拱组合体系桥梁 易损性曲线 

分 类 号：U448.38[建筑科学—桥梁与隧道工程]