软土场地中不同Rayleigh阻尼模型的地震响应研究  

Seismic response study of different Rayleigh damping models in soft soil site

作　　者：钟岱辉[1] 孙文豪 ZHONG Daihui;SUN Wenhao(School of Civil Engineering, Shandong Jianzhu University, Jinan 250101, China)

机构地区：[1]山东建筑大学土木工程学院,山东济南250101

出　　处：《山东建筑大学学报》2022年第2期15-20,59,共7页Journal of Shandong Jianzhu University

摘　　要：软土场地的地震响应研究对场地地震动参数的确定具有重要意义,Rayleigh阻尼模型的选取对场地响应结果有较大影响。文章基于一维时域非线性计算方法,针对国内Ⅲ和Ⅳ类软土场地,利用一维场地地震反应分析程序DEEPSOIL,分析了不同输入地震动作用下3种Rayleigh阻尼模型的场地地表加速度反应谱和地表峰值加速度的差异。结果表明:3种Rayleigh阻尼模型结果的差异主要与振型频率的选择有关;随着输入地震动强度的增大,其在地表加速度反应谱谱值上差异逐渐加大,简化Rayligh阻尼模型的应用应与输入地震动的频谱特性相匹配;理论上扩展的Rayleigh阻尼模型更能真实地体现土体反应,且计算结果与完全Rayleigh阻尼模型在结果上的相差最大仅为6.8%,但计算效率偏低,在DEEPSOIL的工程应用中仍然推荐使用完全Rayleigh阻尼模型。The study of seismic response of soft soil site is of great significance for the determination of seismic ground response parameters,and the selection of Rayleigh damping models had a great influence on the site response results.Based on the one-dimensional time-domain nonlinear calculation method,the paper analyzed the differences in the site ground acceleration response spectrum and peak ground acceleration of three Rayleigh damping models under different input ground motions using the one-dimensional site seismic response analysis program DEEPSOIL at Class III and Class IV soft soil sites in China,and the results showed that the differences in the results of the three Rayleigh damping models were mainly related to the increase of the input ground motion intensity,the differences in the surface acceleration response spectrum of the three Rayleigh damping models gradually increased,and the application of the simplified Rayleigh damping model should match the spectral characteristics of the input ground motion.Theoretically,the extended Rayleigh damping model can more realistically reflect the soil response,and the difference between the calculated results and the full Rayleigh damping model is only 6.8%at most.However,the calculation efficiency is low,and the full Rayleigh damping model is still recommended for engineering applications in DEEPSOIL.

关 键 词：软土场地 场地地震反应 Rayleigh阻尼 时域非线性 

分 类 号：TU435[建筑科学—岩土工程]