基于土—结构动力相互作用的滚珠隔震结构研究

发布时间：2018-06-01 05:22

本文选题：土-结构动力相互作用 + 带凹槽滚珠隔震装置　；参考：《青岛理工大学》2013年硕士论文

【摘要】：基础隔震是在地震作用下维持建筑物正常使用功能的一种重要防护措施。目前大多数基础隔震理论均基于刚性地基假定,没有考虑土结构动力相互作用对结构的影响。国内外学者曾对该问题进行了研究探讨,但缺少土-结构动力相互作用对不同隔震结构影响程度的对比分析,且基于土结构动力相互作用的滚珠隔震结构的研究尚属空白,因此本文对其研究具有较强的理论意义。本文以ANSYS有限元软件和理论分析为支撑,建立框架结构和框剪结构的有限元分析模型,采用带凹槽滚珠隔震装置,通过时程分析来对比土-结构动力相互作用对两种隔震结构的影响程度。本文主要完成以下工作： 1.介绍了已有的滚珠加弹簧复位隔震支座和带凹槽滚珠隔震支座,并建立土-结构动力相互作用下带凹槽滚珠隔震体系的力学模型和运动方程；采用集中质量显式有限元法建立三维时域内土体的运动方程。 2.以有限元理论为基础,将某8层钢筋混凝土框架结构作为研究对象,分为五种情况讨论：1)未隔震结构不考虑土-结构动力相互作用的情况；2)隔震结构不考虑土结构动力相互作用的情况；3)在场地1、场地2、场地3(场地土依次变软)中隔震结构考虑土-结构动力相互作用的三种情况。利用ANSYS软件通过直接法建立分析模型并进行时程分析,对比各种情况下上部结构的地震反应,发现场地土越软,土-结构动力相互作用对框架隔震结构的影响越大。 3.将与上述框架结构相同跨度、层高的某8层钢筋混凝土框剪结构作为研究对象,采用相同的研究方法,得到场地土越软,土-结构动力相互作用对框剪隔震结构影响越大的结论。 4.对比三种场地中土-结构动力相互作用对上述两种隔震结构地震反应影响程度的大小,发现在同一场地条件下,土结构动力相互作用对框剪隔震结构的影响程度大于框架隔震结构,且场地土越软,前者所受土-结构动力相互作用影响的程度同后者相比越明显,即这种影响程度与上部结构的刚度成正比,与地基土刚度成反比。进而指出在结构隔震设计中考虑土-结构动力相互作用的必要性。
[Abstract]:Foundation isolation is an important protective measure to maintain the normal function of buildings under earthquake. At present, most foundation isolation theories are based on the assumption of rigid foundation and do not take into account the influence of soil-structure dynamic interaction on the structure. Scholars at home and abroad have studied this problem, but there is no comparative analysis of the influence of soil-structure dynamic interaction on different isolation structures, and the research of ball isolation structure based on soil-structure dynamic interaction is still blank. Therefore, this study has a strong theoretical significance. Based on ANSYS finite element software and theoretical analysis, the finite element analysis model of frame structure and frame shear structure is established in this paper. Time history analysis is used to compare the influence of soil-structure dynamic interaction on the two isolation structures. The main work of this paper is as follows: 1. This paper introduces the existing ball and spring reset isolation support and the ball isolation bearing with groove, and establishes the mechanical model and motion equation of the ball isolation system with groove under soil-structure dynamic interaction. An explicit finite element method with lumped mass is used to establish the equation of motion of soil in three dimensional time domain. 2. Based on the finite element theory, an 8-story reinforced concrete frame structure is taken as the research object. There are five cases to discuss: (1) the case of unisolated structure does not consider the soil-structure dynamic interaction.) the isolated structure does not consider the dynamic interaction of soil-structure. (3) in site 1, site 2, site 3 (the site and soil become soft in turn). Three cases of soil-structure dynamic interaction are considered in isolated structures. By using ANSYS software to establish the analysis model and carry out time history analysis, comparing the seismic response of superstructure under various conditions, it is found that the softer the site soil, the greater the influence of soil-structure dynamic interaction on the frame-isolated structure. 3. Taking a reinforced concrete frame-shear structure with the same span and story height as the research object, using the same research method, the softer the site soil is obtained. It is concluded that the effect of soil-structure dynamic interaction on frame-shear isolated structures is greater. 4. By comparing the influence of soil-structure dynamic interaction on the seismic response of the two isolated structures mentioned above, it is found that under the same site conditions, The influence of soil-structure dynamic interaction on frame-shear isolated structure is greater than that of frame-isolated structure, and the softer the site soil, the more obvious the former is affected by soil-structure dynamic interaction compared with the latter. The degree of influence is proportional to the stiffness of the superstructure and inversely proportional to the stiffness of the foundation soil. Furthermore, the necessity of considering soil-structure dynamic interaction in structural isolation design is pointed out.
【学位授予单位】：青岛理工大学
【学位级别】：硕士
【学位授予年份】：2013
【分类号】：TU352.12

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