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  2019,Vol.14no.1 ,page:10-23

Simplified Method for Determining Equivalent Damping Ratio of Horizontal Multi-layered Soil Stratum
Abstract:      Some of the soil stratums in real engineering site consist of distinct horizontal layers,in which each layer has its own dynamic parameters such as damping ratios. In this paper, a simplified method is suggested to determine the equivalent damping ratio for horizontal multi-layered soil stratum. Ten equations for calculating equivalent damping ratios were developed based on five weighting functions. The seismic response of two soil stratum are calculated by using these equivalent damping ratios, and the accuracy of the equivalent damping ratios is evaluated indirectly by analyzing the seismic response accuracy of the soil stratum. The result shows that it may causes big error of seismic response if employ the unreasonable equivalent damping ratio. It's reasonable to employ triangular weighting function to compute equivalent damping ratio.
Author NameAffiliation
Yin Lin School of Civil and Transportation Engineering, Ningbo University of Technology, Ningbo 315000, Zhejiang, China
Zhejiang Research Center of Civil Engineering Industrialized Building Construction Technology, Ningbo University of Technology, Ningbo 315000, Zhejiang, China 
Lou Menglin School of Civil Engineering, Tongji University, Shanghai 200092, China 
Kang Shuai School of Civil Engineering and Architecture of Henan University, Kaifeng 475001, Henan, China 
Keywords:    Horizontal multi-layered soil stratum  Seismic response  Equivalent damping ratio  Weighting 1 function
Received on:  March 26, 2018
水平分层土层系统等效阻尼比的简化计算方法
摘要:    在实际工程场地中,很多土层可视为水平分层,各层土的物理和力学性质存在差异,其中包括土的振动阻尼比。本文讨论水平分层土层系统的等效阻尼比的近似计算方法,基于5个不同的加权函数推导了10种等效阻尼比的计算公式。通过2个算例,分别以等效阻尼比为参数计算水平分层土层的地震反应,并与准确解相比较,分析了不同等效阻尼比近似计算方法的计算精度。数值结果表明,若等效阻尼比计算方法选择不恰当,会导致土层地震反应的计算结果出现较大误差。针对2种不同类型的水平分层土层,建议采用基于三角形分布的加权函数来计算土层系统的等效阻尼比。
关  键  词:水平分层土层  地震反应  等效阻尼比  加权函数
基金项目:国家自然科学基金(91315301),宁波市自然科学基金(2015A610303),浙江省教育厅科研项目(Y201533463),王宽诚教育基金会资助项目
作者简介:殷琳,男,生于1982年。讲师。研究方向:地震工程与工程振动,计算力学。E-mail:0710020122@tongji.edu.cn
引用本文格式:殷琳,楼梦麟,康帅.水平分层土层系统等效阻尼比的简化计算方法[J].震灾防御技术英文版,2019,14(1):10-23  DOI:10.11899/zzfy20190102
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