(中铁第四勘察设计院集团有限公司， 湖北 武汉 430063)
刘洋（1990—）， 男， 硕士， 工程师， 从事桥梁设计工作。
U448.21 + 7
More than 40 percent of the land in China is located in the regions with the earthquake intensity 7 degrees and above. With the rapid development of traffic infrastructure construction, the bridge construction is inevitably to span the high earthquake intensity of regions, even the active fault zones. The fall beam has become one of the most common and serious bridge damages during the earthquake. Therefore, the fall-proof design must be carried out for the bridges spanning the fault zones on the basis of fully analyzing the earthquake resistance of structures. Combined with the fall-proof design of a large bridge in Wangjiacun Village, the three-level fall-proof system of simple-supported beam bridge spanning the fault zone is put forward including the three parts of the support system, the inhibiting device system and fall-proof length system. The "three-level fortification" strategy of the system is adopted to prevent the main girder falling, which can provide the reference for the fall-proof design of the simple-supported beam bridges in the high-intensity regions, especially spanning the fault zones.