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位于高烈度区的长联多跨连续梁桥的抗震分析是桥梁设计中非常重要的一个环节,设计不当会导致桥梁构件的破坏甚至整体结构的倒塌,因此需要采用有效的减隔震措施减少这类灾害。本文结合北京市京台高速一座六跨一联总长219.5m的预应力混凝土连续梁桥的工程实例,首先介绍长联多跨桥梁抗震设计的特殊性,阐述了按照常规抗震设计的弊端,然后提出在此类桥梁中搭配使用摩擦摆式减隔震支座和抗震型盆式纵向滑动支座(GPZ(Ⅲ)DX型支座)的设计方法,进行非线性时程分析,得出减隔震设计后该桥的地震响应,归纳出长联多跨桥梁中使用减隔震技术的必要性和有效性,并提出减隔震体系设计中需要考虑的问题和解决方法。
The seismic analysis of the long continuous multi-span continuous girder bridge located in the high intensity zone is a very important link in the bridge design. Improper design will lead to the destruction of the bridge members and even the collapse of the whole structure. Therefore, effective anti-seismic isolation measures should be adopted to reduce this Disaster. In this paper, a Beijing Jingtai high-speed a six-span total length of 219.5m of prestressed concrete continuous girder bridge project example, first of all, introduces the long-span multi-span bridge seismic design of the particularities described in accordance with conventional shortcomings of seismic design, and then proposed In this type of bridge, the design method of friction pendulum vibration isolation bearing and earthquake-resistant basin longitudinal sliding bearing (GPZ (Ⅲ) DX bearing) is used to conduct nonlinear time history analysis. After the design of the bridge’s seismic response, summed up the necessity and effectiveness of the use of anti-seismics technology in long-span multi-span bridges. The problems and solutions to be considered in the design of anti-seismics system are proposed.