基础隔震结构扭转减震系数与控制指标研究
发布时间：2018-11-28 19:31
【摘要】：基础隔震技术是应用较成熟的减震控制技术，国内外对基础隔震有广泛的研究，但是对基础隔震结构扭转减震系数和扭转控制指标方面的研究并不充分。论文通过在ETABS环境中建立典型工程三维模型对上述问题进行了研究。 论文探讨了基础隔震结构扭转产生原因及研究现状，指出了基础隔震结构扭转研究的不足。第二章给出了论文研究所用隔震模型及分析软件，并详细阐述了论文研究采用的数值试验方案和全面试验设计方法。第三章以位移比作为结构扭转的指标，对多遇及罕遇地震下基础隔震结构的扭转效应进行对比分析，研究了地震烈度、上部结构偏心率、隔震层偏心率以及其交互作用对结构扭转的影响。第四章通过对隔震与抗震模型结构对比分析，，研究了基础隔震结构的平动减震率与扭转减震率之间的关系，探讨了不同隔震层偏心率的情况下宏观减震效果可采用的反应指标。 研究表明：上部结构偏心、隔震层偏心及两者的交互作用对结构的扭转位移比有明显的影响；隔震结构上部偏心率小于0.06隔震层偏心率不大于0.04，则结构位移比小于1.2；隔震层偏心率小于0.08，结构位移比小于1.3。对结构减震率的研究表明，当隔震层的偏心率大于5%时，水平减震系数小于扭转减震系数，此时基础隔震结构减震率应考虑扭转的影响，否则水平减震系数大于扭转减震系数，宏观减震效果评价可直接采用水平减震系数。
[Abstract]:Foundation isolation technology is a mature damping control technology. There is extensive research on foundation isolation at home and abroad, but the research on torsional damping coefficient and torsional control index of base-isolated structure is not sufficient. In this paper, three-dimensional model of typical engineering in ETABS environment is established to study the above problems. This paper discusses the cause of foundation isolated structure torsion and its research status, and points out the deficiency of foundation isolation structure torsion research. In the second chapter, the isolation model and analysis software are given, and the numerical test scheme and the overall test design method are described in detail. In chapter 3, taking the displacement ratio as the index of structural torsion, the torsional effect of base-isolated structure under rare and rare earthquakes is compared and analyzed, and the seismic intensity and eccentricity of superstructure are studied. The influence of eccentricity of isolation layer and its interaction on structural torsion. In chapter 4, by comparing and analyzing the isolation and seismic model structures, the relationship between the seismic damping rate and the torsional damping rate of the base-isolated structure is studied, and the response indexes of the macroscopic damping effect under the condition of different eccentricity ratio of the isolation layer are discussed. The results show that the eccentricity of the superstructure, the eccentricity of the isolation layer and the interaction of the two have obvious effects on the torsional displacement ratio of the structure. If the upper eccentricity ratio of isolated structure is less than 0.06, the displacement ratio of isolated structure is less than 1.2, and the eccentricity ratio of isolated layer is less than 0.08 and the displacement ratio of structure is less than 1.3. The results show that when the eccentricity of the isolation layer is greater than 5, the horizontal damping coefficient is smaller than the torsional damping coefficient, and the effect of torsion should be taken into account. Otherwise, the horizontal damping coefficient is larger than the torsional damping coefficient.
【学位授予单位】：南京航空航天大学
【学位级别】：硕士
【学位授予年份】：2013
【分类号】：TU352.12
本文编号：2364048
[Abstract]:Foundation isolation technology is a mature damping control technology. There is extensive research on foundation isolation at home and abroad, but the research on torsional damping coefficient and torsional control index of base-isolated structure is not sufficient. In this paper, three-dimensional model of typical engineering in ETABS environment is established to study the above problems. This paper discusses the cause of foundation isolated structure torsion and its research status, and points out the deficiency of foundation isolation structure torsion research. In the second chapter, the isolation model and analysis software are given, and the numerical test scheme and the overall test design method are described in detail. In chapter 3, taking the displacement ratio as the index of structural torsion, the torsional effect of base-isolated structure under rare and rare earthquakes is compared and analyzed, and the seismic intensity and eccentricity of superstructure are studied. The influence of eccentricity of isolation layer and its interaction on structural torsion. In chapter 4, by comparing and analyzing the isolation and seismic model structures, the relationship between the seismic damping rate and the torsional damping rate of the base-isolated structure is studied, and the response indexes of the macroscopic damping effect under the condition of different eccentricity ratio of the isolation layer are discussed. The results show that the eccentricity of the superstructure, the eccentricity of the isolation layer and the interaction of the two have obvious effects on the torsional displacement ratio of the structure. If the upper eccentricity ratio of isolated structure is less than 0.06, the displacement ratio of isolated structure is less than 1.2, and the eccentricity ratio of isolated layer is less than 0.08 and the displacement ratio of structure is less than 1.3. The results show that when the eccentricity of the isolation layer is greater than 5, the horizontal damping coefficient is smaller than the torsional damping coefficient, and the effect of torsion should be taken into account. Otherwise, the horizontal damping coefficient is larger than the torsional damping coefficient.
【学位授予单位】：南京航空航天大学
【学位级别】：硕士
【学位授予年份】：2013
【分类号】：TU352.12
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