【作者】 黄鹏；

【导师】 杨春； 邓浩；

【作者基本信息】 华南理工大学 ， 建筑与土木工程， 2015， 硕士

【摘要】 本文主要针对目前长周期结构抗震性能评估方面存在的问题,提出对应的改善方案,并通过有限元分析软件Perform-3D对某长周期超高层结构实际项目算例进行分析,总结并提出更为合理完善的长周期超高层结构抗震性能评估方法;针对长周期超高层结构的抗震性能分析结果,提出对应的抗震性能优化方案,并通过算例进行验算,最后总结出对于长周期超高层结构抗震性能优化的合理建议。本文主要研究内容如下:(1)关于进行长周期超高层结构抗震性能评估时,如何合理选取地震波的问题。通过算例(含各类地震波五组,共50条)分析结果表明,在选波阶段,应综合考虑各类因素(持时、周期、反应谱等)对地震波进行挑选,从而一定程度上保证结构地震反应分析结果的多样性和最不利性,进而保证结构分析结果的可靠性。提出针对长周期超高层结构的合理选波原则:选波时应充分考虑长周期地震动记录、长持时地震动记录、人工拟合地震动记录对结构地震响应的影响,同时考虑历史经典地震动记录的补充选取。(2)关于长周期超高层结构抗震性能评估方法合理性和安全性的问题。分别对长周期算例结构进行静力弹塑性分析、动力弹塑性时程分析、结构能量反应分析,并对分析结果进行对比分析。为了能够充分考虑整体结构形变、结构能量累积、构件耗能损伤等性能关键指标,提高抗震性能评估的可靠性和安全性,提出针对长周期超高层结构的抗震性能评估方法:对长周期超高层结构应当同时进行弹塑性时程分析和结构能量反应分析,静力弹塑性分析作必要补充验算。(3)关于长周期超高层结构消能减震方案的研究。结合当今消能减震技术发展成果,提出针对于长周期超高层结构消能减震方案:将防屈曲支撑BRB和粘滞型阻尼器FB应用于此类结构体系,以此控制结构整体塑性耗能、结构位移等安全指标。通过算例结构对消能减震方案效果进行对比研究,得出关于长周期超高层结构的消能减震的建议与结论,为类似实际工程项目提供分析依据。更多还原

【Abstract】 This paper mainly aims at proposing some improving schemes to currently existing problems of seismic performance evaluation of super high-rise buildings with long period, chooses an actual long-period super high-rise structure as the study example to analyze the seismic response with the finite element analysis software Perform-3D, summarizes and puts forward a more reasonable seismic evaluation method for this kind of structures; According to the seismic evaluation results, it also proposes several corresponding schemes for improving the seismic performance, which is verified by the seismic analysis of the study example, and finally sums up some suggestions for improving the seismic performance of long-period super high-rise structures. The main research contents of this paper are as follows:(1) How to choose the earthquake reasonably in the seismic performance evaluation of long-period super high-rise structures. The analysis results of the study example(including a total of 50 earthquake records of different kinds) show that, during the phase of choosing earthquake records, a variety of factors(duration, period and the fitting degree with the response spectrum, etc) should be considered comprehensively, which can guarantee the diversity and the most unfavorablity of seismic analysis results of structures to some extent, as a result, to guarantee the reliability. And it also proposes the principle of choosing earthquake records for long-period super high-rise structures: it should fully consider the effects of long-period earthquakes, long-duration earthquakes and artificial fitting earthquakes on the seismic responses of structures, and should also consider choosing some classic earthquake records in history as supplement.(2) The rationality and security of seismic performance evaluation methods of long-period super high-rise structures. With pushover analysis, dynamic elastic-plastic time-history analysis and energy response analysis respectively, it gets and compares the seismic analysis results of the study example. For fully considering several key performance indices, such as the total structural deformation, the structural energy accumulation, and the energy dissipation and damage of components, as well as improving reliability and security of the seismic performance evaluation, it puts forward the seismic performance evaluation method for long-period super high-rise structures: both elastic-plastic time-history analysis and structure energy response analysis should be carried out for evaluating seismic performance of this kind of structures, and if necessary, it should add pushover analysis for checking.(3) The study on the schemes of energy dissipation and seismic mitigation of long-period super high-rise structures. With modern development achievements of energy dissipation and seismic mitigation technology, it proposes several energy dissipation and seismic mitigation schemes: buckling restrained braces(BRB) and fluid viscous dampers(FD) are applied to this kind of structure system for controlling some safety indices, such as the total plastic energy dissipation of structures and structural displacement. By comparison of effects of these energy dissipation and seismic mitigation schemes on the study example, it gives several suggestions and conclusions on energy dissipation and seismic mitigation of long period super high-rise structures, which can provide the basis for analyses of similar actual construction projects in the future.更多还原