【作者】 宋贞霞；

【导师】 丁海平；

【作者基本信息】 苏州科技学院 ， 结构工程， 2007， 硕士

【摘要】 结构-地基动力相互作用问题是地震工程领域中一个重要的研究课题，同时，近几十年来，基础隔震技术也逐渐被重视，并且得到了广泛的应用。但是在传统的理论分析中，对于基础隔震结构往往忽视土-结动力相互作用对隔震效果的影响。本文针对这一问题，采用大型通用有限元分析软件LS-DYNA对一叠层橡胶垫隔震框架结构在考虑土-结构相互作用下的动力响应进行了计算和分析，得到了一些有益的结果。具体工作如下：1．对土-结构动力相互作用的发展历史，计算方法及基础隔震技术在国内外的发展情况进行了简要地概括总结，提出了存在的问题和本文重点研究工作。2．LS-DYNA软件采用粘性边界(Viscous Boundary)模拟无限域的影响，由于粘性边界是一种精度较低的人工边界，本文在总结粘-弹性人工边界条件的基础上，对LS-DYNA进行了二次开发，通过在LS-DYNA中粘性人工边界上添加弹簧的方法，将粘性边界改进为精度较高的粘-弹性人工边界，从而提高了计算精度，使之可以进行土-结构动力相互作用分析。并通过半空间和全空间的波源、散射问题算例对改进后程序的精度进行了验证。3．以云南省抗震中心综合楼为例，分别建立固定基础的隔震、非隔震模型和考虑土-结构相互作用的隔震、非隔震模型，采用二次开发后的程序对这栋7层框架基础隔震体系进行了结构动力分析，比较了固定基础的隔震与非隔震结构动力响应以及土-结构动力相互作用对隔震结构和非隔震结构的影响。最后，对全文的研究工作进行了总结，并讨论了今后进一步需要的研究工作。更多还原

【Abstract】 The problem of structure-foundation dynamic interaction is an essential research subject in the field of earthquake-engineering. At the same time, in recent years, base isolation technologies attracted more and more concentration and have been wildly used in many fields. However, in the traditional theory analysis, the influence on base isolation property of the soil-structure interaction was seldom considered for the base isolation structure. This paper focus on this problem, calculating and analyzing the response of a structure with laminated rubber beatings considered the soil-structure interaction by LS-DYNA which is one of the large-scale finite element analysis software. Then provide some beneficial results. The details are as follows:1. The development of soil-structure dynamic interaction and calculating methods, as well as the evolution of base isolation technology in the world are summarized briefly in the paper. Furthermore, some existed limitation and emphases of this research work are presented.2. LS-DYNA program simulates the effects of infinite field by adopting viscous boundary. Because the viscous boundary is a kind of low precision artificial boundary, the paper improved viscous boundary to viscous-spring boundary with high precision through adding springs to artificial boundary. The feasibility of this method is testified through the example of wave source and dispersion problems on three dimensions in full space and semi-space.3. This paper takes Anti-seismic Center Synthetical Building in Yunnan Province as an example, and analyzes the 7-storied framed base-isolated structure by inputting seismic waves with improved LS-DYNA. Via establishing essential models to compare the influence of vibration isolator on frame construction with fixed base and the influence of soil-structure dynamic interaction to frame structure with vibration isolator or not.At last, the paper summarized the whole contents, and put forward the further contents that would to be researched.更多还原