摘要
以实际港珠澳大跨度连续梁隔震桥为研究对象,采用纤维塑性铰单元模拟钢筋混凝土桥墩的非线性状态,建立其三维全桥有限元模型,对隔震及非隔震桥梁进行时程分析,采用桥墩曲率延性比和支座极限容许位移作为桥梁损伤破坏指标,定量评价隔震及非隔震桥梁在罕遇和极罕遇地震作用下的抗震性能,探讨隔震桥梁和非隔震桥梁的破坏模式;并研究材料非线性对桥梁结构地震响应的影响。研究结果表明:是否考虑材料非线性,对非隔震桥梁结构地震响应影响较大,对隔震桥梁影响较小;强震下隔震桥梁抗震性能明显高于非隔震桥梁,且破坏模式也不同于非隔震桥梁;隔震桥梁很好地保护桥墩构件,桥墩未发生任何损伤,而非隔震桥梁其桥墩在极罕遇地震作用时进入了严重破坏状态,且桥墩构件先于盆式支座发生损伤破坏。
In this paper,the Hong Kong-Zhuhai-Macao long-span continuous isolated bridge was studied.The fiber-plastic hinge element was used to simulate the nonlinear state of the reinforced concrete pier,and a 3D finite element model of the full bridge was established.The time history analysis of the isolated and non-isolated bridges were carried out.Seismic performance of the isolated and non-isolated bridges under the action of rare and extremely rare earthquakes was quantitatively evaluated by using the curvature ductility ratio of bridge pier and the ultimate allowable displacement of bearing as the indexes of bridge damage and failure.The failure modes of isolated and non-isolated bridges were discussed,and the influence of material nonlinearity on the seismic response of bridge structure was also studied.The results showed that,whether material nonlinearity is considered or not has a great impact on the seismic response of non-isolated bridge and a small impact on the isolated bridge.Under strong earthquakes,the seismic performance of isolated bridges was significantly higher than that of non-isolated bridges,and their failure mode are also different.The pier of isolated bridge is not damaged,for the pier components are well protected.The pier of non-isolated bridge is seriously damaged under extremely rare earthquake,and the pier components are damaged before the pot bearing.
作者
黄襄云
邓春香
刘彦辉
HUANG Xiangyun;DENG Chunxiang;LIU Yanhui(Earthquake Engineering Research & Test Center, Guangzhou University, Guangzhou 510405, Guangdong, China)
出处
《地震工程学报》
CSCD
北大核心
2022年第3期501-508,550,共9页
China Earthquake Engineering Journal
基金
国家重点研发计划重点专项(2019YFE0112500,2017YFC1500705)。
关键词
隔震桥梁
材料非线性
抗震性能
破坏模式
isolated bridge
material nonlinearity
seismic performance
failure mode
