基于实际记录的现有等效线性化分析程序对比研究
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摘要
根据我国建筑抗震设计规范中场地的分类原则,确定日本KiK-net中台站的场地类别。运用SHAKE2000和LSSRLI-1对不同类别场地的峰值加速度、反应谱、剪应变等进行计算,给出Ⅰ~Ⅳ类场地的计算结果,并将计算结果进行汇总后进行对比分析,得到不同场地条件下SHAKE2000和LSSRLI-1计算结果的差异以及计算结果与实测记录之间的差别。研究表明,土的动模量比、阻尼比的非线性以及场地类型对计算结果影响较大,Ⅰ、Ⅱ类场地中大多数情况下SHAKE2000和LSSRLI-1计算结果相差不大;Ⅲ、Ⅳ类场地中多数情况下SHAKE2000和LSSRLI-1计算结果相差不大。以实测记录为基准,SHAKE2000结果好于LSSRLI-1计算结果,特别是对于Ⅲ、Ⅳ类场地中,土体为强非线性工况而言,SHAKE2000结果要明显好于LSSRLI-1计算结果。初步分析表明,SHAKE2000与LSSRLI-1计算结果差异来自于计算剪应变的不同。
Referring to the site classification principles in the code for seismic design for buildings,China,site categories for the stations selected from Kik-Net,Japan,were determined.Using the current equivalent linear programs,Shake2000 and LSSRLI-1,for site seismic response analysis,the peak acceleration,response spectra,and shear strain were calculated for different site categories.The calculated results for the different site categories were compared and the calculation discrepancy between Shake2000 and LSSRLI-1was obtained for the different site categories.In addition,the numerical results were compared to those of real seismic records.The analytical results show that the nonlinearity of the soil dynamic modulus ratio,damping ratio,and site categories have a significant influence on the calculation results.For class I and II sites,the calculated results by Shake2000 and LSSRLI-1were similar for most cases,while for class III and IV sites,the calculated results by Shake2000 and LSSRLI-1were similar for the majority of the cases.With respect to real seismic records,the results by SHAKE2000 are better than those by LSSRLI-1,especially for class III and IV sites.For strong nonlinear soil,the results by SHAKE2000 are noticeably better than those by LSSRLI-1.Preliminary analysis indicates that the difference in the calculated results by SHAKE2000 and LSSRLI-1is due to the difference in the calculated shear strains.
引文
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