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《建筑抗震设计规范》(GB50 011—2010)将工程场地分为四类。目前的抗震设计工作还缺乏针对每类场地的季冻区反应谱分析。设计时只对夏季反应谱进行了计算,缺乏对冬季含冻土场地的数据验算。冻土场地地表响应计算参数多为定性分析,大部分缺乏工程实测数据,同时计算采用的模型缺乏通用性。针对不同类别的场地与不同冻土深度和多种剪切波速组合的工况进行计算,得到了季冻区场地在中等强度地震下的地表反应谱。笔者认为:在一、二类场地中的场地较薄、波速较高的情况下,冬季发生冰冻的反应谱峰值要明显大于夏季未冰冻的反应谱峰值,需要对含冻土的反应谱进行单独计算。三、四类场地中,冬季和夏季反应谱重合,不需要进行单独计算。
The Code for Design of Seismic Design of Buildings (GB50 011-2010) divides the project site into four categories. The current seismic design work also lacks the seasonal frozen zone response spectrum analysis for each type of site. In the design, only the summer response spectrum was calculated, which lacks the data verification of winter frozen ground. Most of the parameters of surface response in permafrost are qualitative analysis, most of them lack of measured data, and the common model of calculation is lacking. For different types of sites and different frozen soil depth and multiple shear wave velocity combinations of working conditions are calculated, the quarry area under medium-intensity earthquake surface response spectrum. The author believes that in the first and second venues in the field is thin, the higher the case of wave velocity, the peak of the winter frozen response spectrum was significantly greater than the peak summer un-frozen response spectrum, the response spectrum containing frozen soil alone Calculate. In the third and fourth types of venues, winter and summer coincidence spectra do not need to be calculated separately.