某平面L形不规则框架结构的抗震性能研究

发布时间：2018-06-26 01:26

本文选题：框架结构 + L形平面　；参考：《安徽建筑大学》2013年硕士论文

【摘要】：改革开放以来我国经济得到了长足发展，各种体型复杂、不规则的建筑逐渐成为人们的追求。但是从结构角度讲，建筑结构越是平面、立面形状复杂、体型丰富，，就越易产生震害，易造成重大的人员伤亡和经济损失，其抗震分析和设计一直受到各国学者高度重视和广泛研究。因此，对体型复杂、不规则的建筑结构进行抗震性能的研究有着重要的理论价值和实际意义。本文选取一重点设防类的平面L型幼儿园框架结构为研究对象，确定合理的计算模型，以有限元为主要研究手段进行抗震性能化设计的研究。本文主要研究工作如下：（1）运用SAP2000结构分析软件，进行多遇地震下的振型分解反应谱分析；（2）运用SAP2000结构分析软件，选取三条地震波，进行地震作用下的弹性时程分析，对比、分析了该结构在弹性阶段的反应谱分析和动力时程分析结果。结果表明：该结构满足“小震不坏”的抗震性能指标，所选三条地震波满足《建筑抗震设计规范》的选波要求；（3）运用SAP2000结构分析软件，选择合理的计算模型，对结构进行非线性动力分析，分析结构在三条地震波作用下的动力特性及地震时的受力变形情况，并与弹性时程分析的结果进行对比。结果表明：罕遇地震下，结构的最大层间位移角小于规范弹塑性层间位移角限值1/50，结构整体性能满足“大震不倒”的设防水准；构件损伤情况表明梁出铰较多，框架柱仅底层柱脚屈服，边榀框架破坏相对严重，扭转边榀效应较明显，这与结构扭转效应相一致；结构构件满足“强柱弱梁”的屈服机制，整体破坏符合框架预期损伤机制；（4）结构平面凹凸不规则，采用SAP2000对多遇地震及罕遇地震下各层楼板应力进行分析，应力云图可直观地观察到结构楼面的相对薄弱部位；（5）考虑工程应用，按中国地震局文件规定复核，并进行抗震加强措施研究。综上分析结果表明：在地震作用下，该平面L型建筑结构虽然形体不规则，但通过合理的结构布置和一些抗震加强措施，可使结构具备一定的承载与变形能力，使达到“小震弹性”、“大震不倒”的抗震设防目标及抗震性能指标。通过在罕遇地震下的弹塑性计算分析，找到结构的潜在抗震薄弱部位，提出了相应的结构抗震加强措施，为工程设计提供参考。
[Abstract]:Since the reform and opening up, China's economy has been greatly developed, various complex, irregular buildings have gradually become the pursuit of people. But from a structural point of view, the more plane the building structure, the more complex the facade and the richer the shape, the more likely it is to cause earthquake damage and cause heavy casualties and economic losses. Its seismic analysis and design has been highly valued and widely studied by scholars all over the world. Therefore, it is of great theoretical and practical significance to study the seismic behavior of complex and irregular building structures. In this paper, a plane L-type kindergarten frame structure is chosen as the research object, a reasonable calculation model is determined, and the seismic performance-based design is studied by means of finite element method. The main work of this paper is as follows: (1) using SAP2000 structure analysis software to analyze the mode decomposition response spectrum under frequent earthquakes; (2) selecting three seismic waves by using SAP2000 structure analysis software. The results of response spectrum analysis and dynamic time history analysis of the structure in the elastic stage are analyzed by comparing the elastic time history analysis of the structure under seismic action. The results show that the structure meets the seismic performance index of "small earthquake is not bad", and three seismic waves are selected to meet the requirements of seismic design code for buildings. (3) using SAP2000 structural analysis software, selecting a reasonable calculation model, The nonlinear dynamic analysis of the structure is carried out. The dynamic characteristics of the structure under the action of three seismic waves and the stress and deformation of the structure during the earthquake are analyzed, and the results are compared with the results of the elastic time-history analysis. The results show that under rare earthquake, the maximum interstory displacement angle of the structure is less than 1 / 50 of the limit value of the standard elastic-plastic interstory displacement angle, and the overall performance of the structure meets the level of fortification of "strong earthquake does not fail", and the damage of the member indicates that the beam has more hinges out of the structure. The frame columns yield only at the bottom of the column, the edge frame is damaged seriously, the torsional edge effect is obvious, which is consistent with the structural torsional effect, the structural members satisfy the yield mechanism of "strong column and weak beam", and the whole failure accords with the expected damage mechanism of the frame. (4) the plane of the structure is irregular, the stress of each floor under the frequent earthquake and rare earthquake is analyzed by SAP2000, the stress cloud diagram can directly observe the relative weak position of the structure floor; (5) considering the engineering application, Review according to the documents of China Seismological Bureau, and carry out seismic strengthening measures. The results of the above analysis show that, under earthquake action, the plane L-shaped building structure has a certain bearing capacity and deformation capacity through reasonable structure arrangement and some seismic strengthening measures, although the shape of the structure is irregular. The seismic fortification target and seismic performance index of "small earthquake elasticity" and "large earthquake will not fail" are achieved. Through the elastic-plastic calculation and analysis under rare earthquake, the potential seismic weak part of the structure is found, and the corresponding anti-seismic strengthening measures are put forward, which can provide a reference for engineering design.
【学位授予单位】：安徽建筑大学
【学位级别】：硕士
【学位授予年份】：2013
【分类号】：TU352.11

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