摘要
为研究多跨连续梁-刚构桥地震易损性,基于OpenSEES平台,建立实际桥梁非线性地震反应分析模型。通过增量动力分析,建立不同桥墩、支座及桥台等桥梁构件易损性曲线,分析了全寿命周期内桥梁关键抗震构件桥墩的时变地震易损性,采用界限法估算桥梁结构系统的失效概率,研究算例桥梁的系统易损性。结果表明:在同一损伤状态下,1^(#)与4^(#)桥墩较易出现损伤,5^(#)桥墩其次,2^(#)和3^(#)桥墩的概率最小,即墩高、材料强度及墩顶约束均会影响其易损性;桥台处支座相比于桥墩处支座,更易产生损伤;两桥台易损性曲线斜率较大,其发生同一损伤的概率无明显差别;全寿命周期内耐久性损伤后桥墩轻微损伤、中等损伤及严重破坏的超越概率显著增大,中等损伤状态下的超越概率分别增大3.1%、11.3%、20.9%、29.1%、34.1%,严重损伤状态下分别增大3.9%、13.5%、25.1%、33.4%、35.4%。桥梁系统易损性大于各构件,采用单个构件易损性来评估桥梁易损性会高估桥梁抗震性能。
In order to study the seismic fragility of multi-span continuous girder-rigid frame bridges,based on OpenSEES platform,a non-linear seismic response analysis model of the actual bridge was established.Through in-cremental dynamic analysis,fragility curves of bridge components such as piers,supports,and abutments were es-tablished.Time-varying seismic fragility of piers of key anti-seismic components of bridges in the whole life cycle was analyzed.The failure probability of bridge structure system was estimated by boundary method,and system fra-gility of bridges was studied as an example.The analysis results showed that in the same damage state,1^(#)and 4^(#)piers were more likely to be damaged,followed by 5^(#)piers,and 2^(#)and 3^(#)piers had the least probability,as to the pier height,material strength and restraint of pier crest all affected its fragility.The bearing at abutment was more likely to cause damage than the bearing at pier;the slope of the fragility curves of the two abutments was larger,and there was no significant difference in their probability of the same damage.The probability of slight,medium and serious damage of pier increased significantly after endurance damage in the whole life cycle,moderate damage state beyond the probability increased by 3.1%,11.3%,20.9%,29.1%,34.1%,respectively,and severe dam-age state increased by 3.9%,13.5%,25.1%,33.4%,35.4%,respectively.Bridge systems were more fragile than individual components,and using the fragility of a single component to evaluate the fragility of the bridge could overestimate the seismic performance of the bridge.
作者
梁岩
张卓航
班亚云
王艳
LIANG Yan;ZHANG Zhuohang;BAN Yayun;WANG Yan(School of Civil Engineering,Zhengzhou University,Zhengzhou 450001,China)
出处
《郑州大学学报（工学版）》
CAS
北大核心
2023年第1期96-102,共7页
Journal of Zhengzhou University（Engineering Science）
基金
河南省重点研发与推广专项(212102310268)
国家自然科学基金资助项目(51608488)。
关键词
桥梁工程
抗震性能
易损性
桥墩
耐久性
bridge engineering
seismic performance
fragility
pier
durability
