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关于局部地形对地震动的影响,一直是地震工程学的研究热点。选取汶川地震中自贡地形台有强震记录的山脊地形和典型地震灾害的北川县城河谷地形进行了强震观测记录、规范方法和数值模拟下的地形放大效应分析,结果表明:(1)规范法基本上可满足一般工程场地的要求;(2)对人员密集居住的高度大于60 m的较陡地形,建议应进行二维(三维)数值模拟下的地形效应分析。这为规范的修订提供了一些基础资料。
The impact of local topography on earthquakes has been a hot research topic in seismic engineering. Strong earthquakes records, normalized methods and topographic amplification effects under numerical simulation are selected from the landforms of Beichuan county in the Zigong terrain in Wenchuan Earthquake, which are recorded by strong earthquakes and typical earthquakes. The results show that: (1) Which can basically meet the requirements of general engineering sites. (2) For steep terrain with a height of more than 60 m, which is densely populated, it is suggested that topographic effect analysis should be conducted under two-dimensional (three-dimensional) numerical simulation. This provided some basic information for the revision of the code.