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以某高速公路上一座跨度为(55+4×90+55)m典型长联连续梁桥为工程背景,采用有限元软件建立其动力分析模型,分析了该桥的动力特性。在100 a超越概率63%和50 a超越概率2.5%两种地震水平作用下,采用反应谱法和时程分析法对桥梁结构进行了地震响应分析,并结合桥墩验算截面的弯矩一曲率关系曲线,评估了该桥的抗震性能。分析结果表明,在E1、E2两种概率地震作用下,桥梁结构处于弹性工作状态,满足下部结构弹性设计的设防目标。研究结果可以指导同类桥梁的抗震设计。
Taking a typical long continuous bridge (55 + 4 × 90 + 55) m on a certain expressway as the engineering background, the dynamic analysis model of the bridge is established by finite element software and the dynamic characteristics of the bridge are analyzed. The seismic response analysis of the bridge structure is carried out by response spectrum method and time-history analysis under the action of 63% of over probability of 100 a and 2.5% of over probability of 50 a over 50 years. Combining with the moment-curvature relationship of the bridge section Curve to evaluate the seismic performance of the bridge. The analysis results show that under the earthquake of E1 and E2, the bridge structure is in elastic working condition and meets the target of fortification of the elastic design of the substructure. The research results can guide the seismic design of similar bridges.