武汉天兴洲大桥纵向地震反应分析

Wuhan Tian Xingzhou Bridge is a railway and road dual-use Chang Jiang River Bridge, which is one of the \\\\\\\\\\\\\\\"fifteen\\\\\\\\\\\\\\\" key constructions founded by Premier’s office of the State Council in the country, and it has the features of large-span main beam, strong bearing capacity, high-speed design and having difficulty in construction. Because of the smaller vertical stiffness, the bridge will have a greater vertical vibration in earthquake. Therefore, it’s very important to ensure the safety of the bridge on how to calculate the displacement of the main beam of Tian Xingzhou Bridge’s deck under vertical vibration and the vertical impact of bridge towers by the main beam. This paper mainly discusses the vertical earthquake response of Wuhan Tian Xingzhou Bridge. I establish the bridge model by sap2000 structure analysis software, and adopt the Dynamic finite element method. After allying the vertical earthquake response of the floating structure under Entering traveling wave by Time-analysis，and comparing the response of vertical by Time-analysis，between the main beams and the bridge towers added by the rigid and elastic support bearing , the result can directly expresses the main characters of the vertical earthquake response all above. The results of earthquake response showed that: In the case of adding a floating structure bearing, the main structural vibration (vertical drift mode) cycle is longer, effectively reducing the internal forces of the Tower in response to the vertical of earthquake，but the result makes the vertical displacement larger and it is essential to reduce the displacement of the main beam by the necessary measures.