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工程科学与技术:2020,52(5):143-150,169
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地震动扭转分量对大跨度斜拉桥易损性影响
(1.大连交通大学 土木工程学院,辽宁 大连 116028;2.防灾科技学院 土木工程学院,北京 101601;3.河北工业大学 土木与交通学院,天津 300401)
Influence of Rotational Ground Motion on Seismic Fragility of Long-span Bridges
(1.School of Civil Eng., Dalian Jiaotong Univ., Dalian 116028, China;2.School of Civil Eng., Inst. of Disaster Prevention, Beijing 101601, China;3.School of Civil and Transporting Eng., Hebei Univ. of Technol., Tianjin 300401, China)
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投稿时间:2019-12-24    修订日期:2020-04-03
中文摘要: 为定量、准确地展现地震动扭转分量的作用效应,以某大跨度斜拉桥为例,采用正态分布拉丁超立方抽样方法,基于OpenSees建立了考虑地震动强度不确定性、材料参数不确定性的15个斜拉桥有限元模型。从PEER地震数据库中选取了15组三向平动、含脉冲效应的近场地震动记录,利用弹性波动理论中的频域法根据地震动平动分量获取相应的扭转分量,并以此分为两种工况对结构进行非线性动力时程分析得到桥梁地震响应。其后,在确定损伤指标的基础上,基于概率需求分析法绘制了桥梁关键构件的地震易损性曲线。结果表明:地震动扭转分量对大跨度斜拉桥易损性影响显著,损伤变化程度与构件种类、损伤方位均有明显相关性。其中桥塔中部截面对地震动扭转分量的敏感程度最高,扭转分量所导致的损伤概率增幅高达22.12%。扭转分量亦对塔底截面和边墩底截面(横桥向)具有较高破坏作用,损伤概率增幅最大值分别达到17.33%和19.45%。针对主梁及其纵向约束构件,地震动扭转分量则使其损伤概率略有降低。
Abstract:To study the seismic response of long-span bridges under the rotational ground motion, based on OpenSees, fifteen finite element models was built for one cable-stayed bridge considering the uncertainty of earthquake intensity and material parameters by using normal distribution Latin hypercube sampling method. A total of 15 groups of near-fault pulse ground motions were selected from the PEER ground motion database. Then, the rotational components of the ground motions were obtained from the seismic translational components based on the elastic wave theory. The dynamic response of the bridge was obtained through nonlinear dynamic time -history analysis. The damage indexes for the bridge components were proposed. The seismic fragility curves for the key components of the bridge were drawn based on the probabilistic demand analysis method. The results showed that the damage probability of the key components of the bridge would be significantly changed when the rotational ground motion was considered. The increase of the bridge damage probability was closely related to the bridge component type and damage direction. When the rotational ground motion was considered, the middle section of the tower has the highest sensitivity to the torsion component of ground motion. The damage probability of the tower under the ground motions with rotational component would be increased as much as 22.12% compared with that without considering rotational ground motion. The rotational ground motion also had a higher destructive effect on the bottom section of the tower and the bottom section of the side pier (in bridge transverse direction), with a damage probability increase of 17.33% and 19.45%, respectively. However, for the deck and its longitudinal restraint members, the damage probability of these members would be slightly reduced when the rotational ground motion was considered.
文章编号:201901224     中图分类号:U448.27    文献标志码:
基金项目:国家重点研发计划项目(2016YFC0701108);国家自然科学基金项目(51678150);辽宁省自然科学基金项目(20170540134;20180550380);大连理工大学海岸和近海工程国家重点实验室基金项目(LP1617)
作者简介:王德斌(1984-),男,副教授,博士.研究方向:结构与桥梁抗震研究.E-mail:wdb1215@163.com
引用文本:
王德斌,李新,孙治国,王东升,刘军.地震动扭转分量对大跨度斜拉桥易损性影响[J].工程科学与技术,2020,52(5):143-150,169.
WANG Debin,LI Xin,SUN Zhiguo,WANG Dongsheng,LIU Jun.Influence of Rotational Ground Motion on Seismic Fragility of Long-span Bridges[J].Advanced Engineering Sciences,2020,52(5):143-150,169.