跨断裂带简支梁桥三级防落梁系统设计
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(中铁第四勘察设计院集团有限公司, 湖北 武汉 430063)

作者简介:

刘洋(1990—), 男, 硕士, 工程师, 从事桥梁设计工作。

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中图分类号:

U448.21 + 7

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

    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系统,包含支座系统、限位装置系统和防落梁长度系统三部分。该系统采取“三级设防”的策略来防止主梁坠落,可为高烈度区,尤其是跨断裂带简支桥梁的防落梁设计提供借鉴和参考。

    Abstract:

    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.

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历史
  • 收稿日期:2021-06-15
  • 最后修改日期:2021-06-15
  • 录用日期:2021-07-27
  • 在线发布日期: 2022-03-07
  • 出版日期: 2021-03-15
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