研究目的:桥梁工程作为震区交通线的重要枢纽工程,其抗震性能关系到抗震救灾工作的大局.多次破坏性地震一再显示了桥梁工程遭到破坏的严重后果,也一再显示了对桥梁工程进行正确抗震设计的重要性.因此,有必要对桥梁结构的抗震问题进行详尽的分析和论述.研究结论:以京良路改建工程上跨京广铁路立交桥为工程背景,对该桥进行了模态分析并验算了E1地震作用下的结构强度以及E2地震作用下的结构变形.经过验算与分析,本项目结构在E1地震作用下,结构满足强度要求；在E2作用下,塑性角区域的最大转角验算均满足规范要求；墩顶最大位移为2.59 cm,发生在人工波3激励下的5号墩墩顶并小于位移容许值；各桥墩的剪力设计值也远远小于容许剪力值.本项目结构满足设计的安全性和可靠性,为实际工程中桥梁结构的抗震验算提供了一定的参考依据.%Research purposes: The bridge project is as an important project in earthquake region, and it's seismic behavior is crucial to the earthquake relief work. Several destructive earthquakes show that once the bridge engineering is damaged, the serious consequence will occurred and it also shows the importance of bridge's seismic design.Therefore, it is necessary to analyze and discuss the bridge seismic design in details.rnResearch conclusions: For reconstruction project of the interchange bridge across the Beijijing-Guangzhou Railway in Jingliang Road, the modal analysis was made and the calculation was made for the structural strength under El earthquake effect and the structure deformation under E2 earthquake effect. It proved that the bridge could meet the requirements of strength under El earthquake effect . Under E2 earthquake effect, the maximum turning angle of the plastic-hinge region met the standard requirements. The maxium displacement of the pier top was 2. 59 cm and it happened on the top of pier #5 under the exitation of artificial wave #3. This value was smaller than the permissible value. The designed shear forces of the piers were much smaller than the permissible value. Therefore, this bridge structure could meet the designed requirement for safely and reliability and it could be as the reference to the similar works.
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