国内两种典型土层地震反应分析程序对比研究

Contrast of Seismic Response Analysis Programs between Two Domestic Typical Soil Layers

重大工程场地施工之前需要对场地进行详细的工程抗震设计,而场地安全性评价是这其中的重要部分。地震系统内使用广泛的是LSSRLI-1分析程序,结果稳定,受众广泛。近期由工力所袁晓铭团队开发的新一代土层反应分析程序SOILQUAKE网页版开放使用。为得到这两个程序在基本工况下的对比,场地类型选用了硬、中硬、软三种类型,在6个场地分别输入了不同强度、不同频谱特征的三条地震动及其调幅地震动。对比两个程序得到的峰值加速度、输出时程、反应谱。结果显示:硬场地时两者的PGA与反应谱相差极小;中硬场地时PGA相对差平均值为21%,SOILQUAKE的反应谱值普遍大于LSSRLI-1,在高频部分这一差异更明显;软场地时SOILQUAKE反应谱值远大于LSSRLI-1结果,更接近实际地震记录统计结果。

It is necessary to carry out a thorough engineering seismic design of the site before major engineering site construction,and the safety evaluation of the site is an important part.LSSRLI-1 analysis program,which is stable and widely available,is used extensively.Recently,the new generation of soil layer response analysis program,SOILQUAKE,developed by Yuan Xiaoming's group from IEM,is available to use.To get a contrast of these two programs in the basic condition,we selected three kinds of sites,such as hardness medium hard and soft fields,and three ground motions of different intensity and frequency spectrum and their vibration amplitude modulation are applied to 6 sites respectively.Then we compared the peak acceleration,output time history,and response spectrum by these two programs.As the results show,there is little difference in both PGA and response spectrum by these two programs in hard field.The mean relative difference of PGA in medium hard field is 21%,the response spectrum of SOILQUAKE is larger than that of LSSRLI-1,and this difference is more evident in the high frequency part.In the soft field,the response spectrum of SOILQUAKE is far larger than that of LSSRLI-1,which is more closer to the statistics of actual earthquakes.