重庆某高层的超限分析和梁式转换层抗震影响因素分析

发布时间：2018-03-14 01:33

本文选题：超限高层　切入点：性能化设计　出处：《重庆大学》2016年硕士论文　论文类型：学位论文

【摘要】：经济的快速发展加速了城市建设的步伐,导致城市土地资源紧缺问题日益严重。建筑越来越高,结构体系也更加复杂,带转换层高层建筑的出现满足底部大空间和上部住宅办公的使用需求。越来越多的建筑工程在高度和规则性方面超出规范的要求,在地震下的反应强烈,内力变形较大,性能指标不易控制,常存在薄弱部位,为了提高此类结构设计的可靠性,应严格按照规范对此类工程进行超限项目审查和结构分析。选择合适的抗震设计方法完成超限结构的抗震计算从而得出定量的分析结果,判断结构性能是否能达到要求的性能水准,针对存在的薄弱部位给出合理的加强措施,正是本论文的主要研究的内容和目的。本文选择重庆某存在超B级高度和高位转换等超限项的高层建筑作为研究对象,运用基于性能的抗震设计方法完成结构的抗震设计,通过对结构在小震、中震和大震下的计算结果进行分析论证,明确结构的变形和破坏过程,确保结构实现抗震设防目标。为了明确梁式转换层对结构抗震性能的影响,本文最后分析了转换梁刚度、转换层楼板厚度、框支层刚度等三个因素对结构振动和抗震性能的影响。本文所做的工作和主要结论如下:采用Midas Building软件完成结构的反应谱分析,并运用ETABS软件进行对比分析,结合规范比较分析结构的周期比、位移比等整体弹性指标,根据分析结果判断所建模型合理。采用Midas Building软件完成弹性时程分析,对比反应谱分析结果,判断得出弹性时程分析结果虽满足规范要求但分析结果略小,应采用反应谱分析结果进行配筋设计。采用ETABS、Midas Building两软件完成中震下结构性能分析,从结构整体指标和关键构件性能两个方面判断结构可以实现“中震可修”的性能目标。采用Midas Building软件完成结构的Pushover分析,对比反应谱分析结果,判断结构整体指标满足规范和经验要求。根据性能点处和最终状态下的框架和剪力的塑性铰的状态,明确结构的塑性发展情况,针对结构的薄弱部位给出加强措施,罕遇地震下结构不倒塌目标可以实现。改变原模型的转换梁刚度、转换层楼板厚度和框支层刚度等得到分析模型,从周期、楼层剪力和层间位移角等指标判断以上因素对地震下结构振动和抗震性能的影响,得到分析结论,给工程设计提供参考。
[Abstract]:The rapid development of economy accelerates the pace of urban construction, leading to a growing shortage of urban land resources. The appearance of high-rise building with transition floor meets the needs of large space at the bottom and the use of the upper residential office. More and more building projects exceed the requirements of the code in terms of height and regularity, and the response under earthquake is strong, and the internal force deformation is larger. The performance index is not easy to control, and there are often weak parts. In order to improve the reliability of the design of this kind of structure, This kind of project should be examined and analyzed strictly in accordance with the specifications, and the appropriate seismic design method should be selected to complete the seismic calculation of the over-limit structure to obtain the quantitative analysis results. To determine whether the performance of the structure can meet the required performance level, and to give reasonable strengthening measures for the weak parts of the structure, It is the main research content and purpose of this paper. In this paper, a high-rise building with over-B height and high conversion is selected as the research object, and the seismic design method based on performance is used to complete the seismic design of the structure. Through the analysis and demonstration of the calculation results of the structure under small earthquake, moderate earthquake and strong earthquake, the deformation and failure process of the structure is clarified, so as to ensure that the structure achieves the seismic fortification target. In order to clarify the influence of the beam transfer story on the seismic performance of the structure, Finally, the effects of three factors, such as the stiffness of the transfer beam, the thickness of the transfer floor and the stiffness of the frame-supported floor, on the vibration and seismic performance of the structure are analyzed. The work and main conclusions of this paper are as follows: the response spectrum of the structure is analyzed by Midas Building software. The ETABS software is used to compare and analyze the whole elastic index of the structure, such as period ratio, displacement ratio and so on. According to the results of the analysis, the model is reasonable. The Midas Building software is used to complete the elastic time history analysis. Comparing with the results of response spectrum analysis, it is concluded that the results of elastic time history analysis meet the requirements of specifications but the results of analysis are slightly small. The reinforcement design should be carried out by using the results of response spectrum analysis. The performance goal of "moderate earthquake repairable" can be realized by judging the whole structure index and the performance of key components. The Pushover analysis of the structure is accomplished by Midas Building software, and the results of response spectrum analysis are compared. According to the state of the frame and the plastic hinge of the shear force at the performance point and the final state, the plastic development of the structure is determined, and the strengthening measures are given for the weak part of the structure. The objective of not collapsing the structure under rare earthquake can be achieved. The stiffness of the transfer beam, the thickness of the transfer floor and the stiffness of the frame branch can be obtained by changing the stiffness of the original model. The influence of the above factors on the vibration and seismic performance of the structure under earthquake is judged by the indexes of floor shear force and interstory displacement angle. The conclusion of the analysis is obtained, which provides a reference for the engineering design.
【学位授予单位】：重庆大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：TU973.31

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