某既有高层混凝土结构性能提升改造设计研究

发布时间：2018-03-19 10:01

本文选题：抗震加固设计　切入点：多遇地震　出处：《沈阳建筑大学》2014年硕士论文　论文类型：学位论文

【摘要】：基于性能的抗震设计理论的出现颠覆了传统的抗震思想,这种设计方法将单调、宏观的抗震设计转变为目标具体、定量、多重的抗震设计。并且业主可选择设计性能目标及其设防的水准。这种设计方法可以对结构抗震性能进行深入细致的分析,以此同时更好的体现出设计人员的主动性。这一抗震设计思想引入到我国抗震加固设计中有着重要的利用价值。大量的震害使人们越来越意识到结构抗震加固设计的重要性,弹性分析法固然简便,但忽略了结构的非线性特征,无法描述出结构在大震情况下各构件进入弹塑性状态的内力和变形状态。而静力弹塑性分析方法操作简便,在一定的情况下可以代替动力弹塑性分析,对结构进行罕遇地震下的评估。为了更好的对该加固结构进行抗震性能的评价,本文采用弹性分析和静力弹塑性分析方法对辽宁地区某复杂高层加固进行抗震性能评价。本文以朝阳市某复杂高层的加固、改造为研究对象,并以加固、改造后的复杂高层在罕遇地震作用下的非线性性能状态为主题,对钢筋混凝土结构加固、改造的复杂高层进行了以下研究：通过采用Midas building有限元分析软件,建立有限元分析模型。对分别采用剪力墙、钢支撑及翼墙加固的复杂高层进行多遇地震和罕遇地震作用下的验算,对其抗震性能做出评估。在多遇地震作用下,对结构进行反应谱分析以及弹性时程分析。在进行弹性时程分析时,通过输入两条天然波一条人工波,对结构进行弹性时程分析。通过比较结构的顶点时程曲线、层间位移角、层剪力分布等情况,对加固后的复杂高层进行抗震性能评价。在罕遇地震作用下,对结构进行了静力弹塑性分析。在进行静力弹塑性分析时,对结构采用层剪力加载方式,通过分析三种加固形式下得到的基底剪力—顶点位移曲线、出现性能点时的层间位移角、层剪力分布和塑性铰分布情况,对加固后的复杂高层进行抗震性能评估。通过比较静力弹塑性分析方法得出的结果,得到增设剪力墙加固对本结构性能提升最多。
[Abstract]:The emergence of performance-based seismic design theory subverts the traditional idea of seismic design. This design method transforms monotonous and macroscopic seismic design into concrete and quantitative objectives. Multiple seismic design. And the owner can choose the design performance target and the level of the fortification. This design method can carry on the thorough detailed analysis to the seismic performance of the structure, At the same time, it better reflects the initiative of designers. This idea of seismic design is of great value in the seismic strengthening design of our country. A great deal of earthquake damage makes people more and more aware of the importance of seismic strengthening design of structures. Although the elastic analysis method is simple and convenient, it ignores the nonlinear characteristics of the structure and cannot describe the internal force and deformation state of each member in the elastoplastic state of the structure under the strong earthquake. The static elastoplastic analysis method is easy to operate. Under certain conditions, the structure can be evaluated under rare earthquake instead of dynamic elastoplastic analysis. In this paper, elastic analysis and static elastic-plastic analysis are used to evaluate the seismic performance of a complex high-rise reinforcement in Liaoning area. The nonlinear behavior of the reconstructed complex high-rise subjected to rare earthquake is studied in this paper. The reinforced concrete structures are strengthened and reconstructed by using Midas building finite element analysis software. The finite element analysis model is established. The seismic behavior of the complex high-rise reinforced by shear wall, steel bracing and wing wall is evaluated under the action of frequent earthquake and rare earthquake. In the elastic time history analysis, the elastic time history analysis of the structure is carried out by inputting two natural waves and one artificial wave. By comparing the vertex time history curve of the structure and the displacement angle between layers, the elastic time history analysis of the structure is carried out by means of the input of two natural waves and one artificial wave. In the case of story shear distribution, the seismic behavior of the reinforced complex high-rise is evaluated. Under the rare earthquake, the static elastic-plastic analysis of the structure is carried out. In the static elastic-plastic analysis, the story shear loading method is used for the structure. By analyzing the shear-vertex displacement curve of the base under three reinforcement forms, the interstory displacement angle, shear force distribution and plastic hinge distribution are obtained when the performance points appear. By comparing the results of static elastic-plastic analysis, it is found that the performance of this structure is most improved by adding shear wall to reinforce the structure.
【学位授予单位】：沈阳建筑大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TU973.12

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