2种典型土层地震反应分析方法在软土场地的适应性

Adaptability of Two Typical Seismic Response Analysis Methods to Soft Soil Sites

基于日本强震观测网(K-NET)的强震记录,对典型的时域非线性分析方法(NERA)和国内新型等效线性化方法(SOILQUAKE)进行检测,分析了其在软土场地的适应性。检测了10个软土场地共28条强震记录,地表峰值加速度为0.09~1.21 g,土层厚度为50~150 m。结果表明:在强震动(烈度七度以上)作用下,无论Ⅲ类和Ⅳ类场地的SOILQUAKE计算结果都较为接近实测结果,计算结果稳定、可靠;而NERA在高强震动(八度及以上)作用下,计算结果与实测偏差较大,且出现计算的放大系数小于1的不合理情况。

Based on the strong earthquake records of Japan’s kik-net strong earthquake observation network,the typical time-domain nonlinear analysis method(NERA)and the new domestic equivalent linearizaion method(SOILQUAKE)were detected and their adaptability to soft soil was analyzed.A total of 28 records of strong earthquakes recorded in 10 soft soil sites were detected,and the peak surface acceleration ranged from 0.09 g to 1.21 g,and the soil thickness ranged from 50 m to 150 m.Results showed that the strong vibration(intensity of 7 degrees or above),no matterⅢ,Ⅳvenues,SOILQUAKE calculation results were relatively close to the measured results,the result of calculation was more stable and reliable.However,under the action of high intensity vibration(octave and above),the calculation result of NERA had a large deviation from the actual measurement,and the calculated amplification coefficient was less than 1,which was unreasonable.