考虑非线性特征及二维效应的日本小田原试验场地地震动模拟分析

The simulation and analysis of the ground motion at the test site,Odawara,Japan considering the nonlinear and 2 dimension characters

基于日本小田原Ashigara Valley试验场地模型及真实的地震数据,分别建立了国内外广泛采用的一维等效线性化及二维线性场地模型以及采用谱比分析的方法考虑场地的二维非均匀和非线性特征对地震动的影响的修正模型,研究了各类地震动预测分析模型的可靠性。通过3种分析模型计算的观测点地震动,同获得的真实记录进行了对比,研究了不同分析模型下的地震动特征。结果表明了,3种分析模型所计算出来的反应谱曲线总趋势同实际值较为吻合,综合反应谱、加速度峰值以及持时3方面特征,二维修正非线性非均匀模型预测效果最为理想,其次是一维等效线性化模型。从各输出点来看,KS1和KD2预测效果最佳、KS2相对较差,可能是场地参数不明确的影响。

Based on the site model and real seismic data of the Ashigara valley test site at Odawara,Japan,many numerical methods are used to simulate the seismic motions for the reliability of the models. In this paper,2D linear inhomogeneous model,one dimension equivalent linearization model,and 2D revised model considering nonlinear character are used to simulate the seismic motions and the results are contrast with the real data acquired at the test site. The results display that the curves of the response spectral computed by the three analysis model have a good fit with the actual values. Considering the total effect on the peek acceleration,the response spectral and the effective duration,the two dimension revised model is better than the other two methods,the second is the 1D equivalent linearization model. Among the simulation results of three output positions,the results of KS1 and KD2 is better than KS2.