跨断裂带简支梁桥三级防落梁系统设计

我国四成以上的国土位于地震烈度7度及以上地区,随着交通基础建设的快速发展,桥梁建设不可避免地会跨越高地震烈度区,甚至是活动断裂带.落梁已成为地震发生时最常见和最严重的桥梁破坏形式之一,因此跨断裂带桥梁的设计在充分进行结构抗震分析的基础上,必须要进行防落梁设计.结合王家村特大桥防落梁设计提出了跨断裂带简支梁桥的三级防落梁...

Design of Three-level Fall-proof System of Simple-supported Beam Bridge Spanning Fault Zone

The seismic intensity of more than 40 percent of China''s land is equal to or above 7. As the construction of traffic infrastructures develops fast, more and more bridges are built across the highly seismic regions, or even the active fault zones. Unseating damage has become one of the most common and serious bridge damages for earthquake. Therefore, for the bridges across fault zones, unseating prevention must be designed based on the seismic analysis of the bridge structure. In this paper, we propose a three-level unseating prevention system for the simply supported beam bridges across fault zones, based on the Wangjiacun Bridge. The system consists of three parts: the support system, the restrainer system and the unseating prevention length system. We adopt a "three-level fortification" strategy to prevent unseating, which can be a good reference for the design of unseating prevention system for the simply supported beam bridges across highly seismic regions, especially fault zones.