摘要
工程场地地震安全性评价中计算二维复杂场地地震反应分析时,如采用一维等效线性化分析模型会带来较大的误差,而直接采用二维的非线性模型在技术上还存在一定的困难和不合理性。目前工程中多采用对一维分析结果进行二维修正的思想给出设计地震动及反应谱。然而在建立二维分析模型时,由于勘测条件的限制使模型建立出现很多不确定性。基于以往提出的二维复杂工程场址设计地震动的修正分析思想,建立了几种可能且工程认可的二维复杂场地模型,主要研究不同分层特征模型及土层剪切波速这一物理参数不确定时对设计地震动的影响,进一步考虑不同场地类别下,不同二维分层模型及土体物理参数对地震动的影响。根据分析结果提出了不同类别场地下,方便且合理建立二维复杂场地地震动分析模型的方法,为实际工程中模型的建立及参数的选取提供一些参考。
The one dimension equivalent linear layer model will bring about significant error used for the typical2 D engineering site under evaluating the safety in earthquake. It is difficult and unreasonable to considering the two-dimension nonlinear model in engineering analysis. The revised methods are often used to take account into2 D ground motion under complex site conditions. When the 2D FEM model is founded,the soil parameters are determined by the test and the shear wave velocity report of boreholes. Due to restrictions of surveying level,the computational FEM models exists a lot of uncertain factors. Based on the presented revised method for theengineering site under the 2D complex site conditions,several reasonable and approval models are established for2 D complex site in engineering. The influences on the design ground motion are discussed,considering the model of different hierarchical features and the physical parameters of soil shear wave velocity. Moreover,the influences on the design ground motion are discussed,considering the above factors under the different site category cases.Based on the computational results,some reasonable suggestions on establishment of 2D complex site models under different site category cases are proposed. Some significant references are provided for choosing the design parameters of ground motion in 2D engineering sites.
出处
《华南地震》
2014年第4期27-34,共8页
South China Journal of Seismology
基金
国家自然科学基金资助项目(51178123)
广东省科技计划项目(2013B020200014)
关键词
复杂场地
设计地震动
等效线性化
Complex site
Designed seismic motion
Equivalent linear layer model
