跨活动断裂带桥梁抗震设计与构造研究

Seismic Design and Structural Study of Bridges Across Active Fault Zones

跨越活动断裂带的桥梁抗震设计是一个复杂的系统性问题,本文以跨越云南鲁甸地震主断裂带“龙树-猴子坡断裂”的营盘大桥为研究对象,在分析桥位区地震构造特征和大桥抗震设防要求基础上,通过全面调研国内外规范和研究成果,开展高地震烈度区的抗震设计,分析断裂位错量对结构的影响,根据“多道防线、分级耗能”的设计理念和原则,从桥梁抗震概念设计、减隔震设计和防落梁系统设计三方面给出跨断裂带桥梁的设计思路和具体抗震措施,以期为同类型结构的抗震设计提供参考。

Seismic design of bridges across active fault zones is a complex and systematic problem.Yingpan Bridge was taken as a research subject,which crossed the Longshu-Houzipo breakage of Ludian earthquake fault zone in Yunnan Province.A comprehensive study of domestic and international codes and research results was investigated based on the analysis of the seismic structural characteristics of the bridge location and bridge the requirements for seismic resistance.The seismic design of the bridge in the high seismic intensity zone was carried out with the consideration of the influence of the fracture dislocations generated by the active fault zone on the structure.According to the design concept and principle of“multiple lines of defense and graded energy consumption”,design strategies and concrete anti-seismic measures of Yingpan Bridge were put forward from aspects of seismic conceptual design of bridge,seismic isolation design and anti-falling beam system,which could providea reference for the seismic design of samilar structures.