【作者】 何颖；

【导师】 梁建文；

【作者基本信息】 天津大学 ， 防灾减灾工程及防护工程， 2013， 博士

【摘要】 准确评价场地动力特性对于工程结构的抗震设计十分重要，找到一种简便易行、可避免大量的钻孔工作、且满足工程精度要求的场地总体动力特性估计方法，具有重要的工程价值。论文主要工作及创新如下：论文在总结了国内外场地非线性反应分析以及场地动力特性识别的研究现状的基础上，提出了场地总体非线性动力特性识别的一个方法。方法以一已知参考场地为基础，假定参考场地和待识别场地具有相同的基岩露头运动，根据参考场地和待识别场地地表主震和余震记录，识别场地的总体非线性动力特性。论文选取了天津四个实际场地，一个作为参考场地，其余三个为待识别场地，利用一维波动理论，基于等效线性化法，将三个待识别场地等价为一层或者三层，以三种不同的地震波输入产生的场地地面反应作为地表记录，应用刚性基岩模型进行总体非线性动力特性的识别。考虑到实际基岩为弹性，论文并采用弹性基岩模型对场地总体非线性动力特性进行了识别。研究表明，方法简便可行、稳定可靠，计算得到的场地非线性特征基本符合土工试验范围，且预测的地面运动与实际记录吻合，具有工程实用价值。更多还原

【Abstract】 It is very important in engineering that estimating site dynamic characteristicwell and truly，especially in structural seismic design. It has important engineeringsignificance for seismic design of structures that finding a simple and easy method,which can avoid plenty of boring, satisfy the requirements of engineering accuracy,and estimate the general dynamic characteristics of site. The following are maincontents and innovative achievements.The paper reviewed the current advancements at home and abroad in the fields ofnonlinear seismic response analysis and estimation of site dynamic characteristics.Then a method is proposed which can estimate the site general dynamiccharacteristics. The method based on a known reference site, assuming there are sameoutcrops movements between the reference site and the unknown site, according therecords of aftershock and main shock on the reference site and the unknown site, canestimate the general dynamic characteristics of the unknown site. The method can beused in engineering directly.Four real sites in Tianjin District are selected in the paper. One of those is treatedas reference site. The others are treated as unknown sites. Using one-dimension shearwave propagation and equivalent linear method, the general dynamic characteristicsof unknown sites, which are already equivalent to a layer or three layers, are estimatedin the cases of inputting three earthquakes in the paper. The rigid bedrock model isused firstly. Then considering the real bedrock is elastic, the elastic bedrock model isused to improve the method.It is shown that the results are stable and reliable. They are almost in the testscope of soil. And the predicted ground motion is similar to the real response of site.The method is feasible and valuable for engineering.更多还原