發(fā)布時(shí)間：2018-06-01 05:22

  本文選題：土-結(jié)構(gòu)動(dòng)力相互作用 + 帶凹槽滾珠隔震裝置　； 參考：《青島理工大學(xué)》2013年碩士論文

【摘要】：基礎(chǔ)隔震是在地震作用下維持建筑物正常使用功能的一種重要防護(hù)措施。目前大多數(shù)基礎(chǔ)隔震理論均基于剛性地基假定,沒(méi)有考慮土結(jié)構(gòu)動(dòng)力相互作用對(duì)結(jié)構(gòu)的影響。國(guó)內(nèi)外學(xué)者曾對(duì)該問(wèn)題進(jìn)行了研究探討,但缺少土-結(jié)構(gòu)動(dòng)力相互作用對(duì)不同隔震結(jié)構(gòu)影響程度的對(duì)比分析,且基于土結(jié)構(gòu)動(dòng)力相互作用的滾珠隔震結(jié)構(gòu)的研究尚屬空白,因此本文對(duì)其研究具有較強(qiáng)的理論意義。 本文以ANSYS有限元軟件和理論分析為支撐,建立框架結(jié)構(gòu)和框剪結(jié)構(gòu)的有限元分析模型,采用帶凹槽滾珠隔震裝置,通過(guò)時(shí)程分析來(lái)對(duì)比土-結(jié)構(gòu)動(dòng)力相互作用對(duì)兩種隔震結(jié)構(gòu)的影響程度。本文主要完成以下工作： 1.介紹了已有的滾珠加彈簧復(fù)位隔震支座和帶凹槽滾珠隔震支座,并建立土-結(jié)構(gòu)動(dòng)力相互作用下帶凹槽滾珠隔震體系的力學(xué)模型和運(yùn)動(dòng)方程；采用集中質(zhì)量顯式有限元法建立三維時(shí)域內(nèi)土體的運(yùn)動(dòng)方程。 2.以有限元理論為基礎(chǔ),將某8層鋼筋混凝土框架結(jié)構(gòu)作為研究對(duì)象,分為五種情況討論：1)未隔震結(jié)構(gòu)不考慮土-結(jié)構(gòu)動(dòng)力相互作用的情況；2)隔震結(jié)構(gòu)不考慮土結(jié)構(gòu)動(dòng)力相互作用的情況；3)在場(chǎng)地1、場(chǎng)地2、場(chǎng)地3(場(chǎng)地土依次變軟)中隔震結(jié)構(gòu)考慮土-結(jié)構(gòu)動(dòng)力相互作用的三種情況。利用ANSYS軟件通過(guò)直接法建立分析模型并進(jìn)行時(shí)程分析,對(duì)比各種情況下上部結(jié)構(gòu)的地震反應(yīng),發(fā)現(xiàn)場(chǎng)地土越軟,土-結(jié)構(gòu)動(dòng)力相互作用對(duì)框架隔震結(jié)構(gòu)的影響越大。 3.將與上述框架結(jié)構(gòu)相同跨度、層高的某8層鋼筋混凝土框剪結(jié)構(gòu)作為研究對(duì)象,采用相同的研究方法,得到場(chǎng)地土越軟,土-結(jié)構(gòu)動(dòng)力相互作用對(duì)框剪隔震結(jié)構(gòu)影響越大的結(jié)論。 4.對(duì)比三種場(chǎng)地中土-結(jié)構(gòu)動(dòng)力相互作用對(duì)上述兩種隔震結(jié)構(gòu)地震反應(yīng)影響程度的大小,發(fā)現(xiàn)在同一場(chǎng)地條件下,土結(jié)構(gòu)動(dòng)力相互作用對(duì)框剪隔震結(jié)構(gòu)的影響程度大于框架隔震結(jié)構(gòu),且場(chǎng)地土越軟,前者所受土-結(jié)構(gòu)動(dòng)力相互作用影響的程度同后者相比越明顯,即這種影響程度與上部結(jié)構(gòu)的剛度成正比,與地基土剛度成反比。進(jìn)而指出在結(jié)構(gòu)隔震設(shè)計(jì)中考慮土-結(jié)構(gòu)動(dòng)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.
【學(xué)位授予單位】：青島理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2013
【分類號(hào)】：TU352.12

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