竖向不规则高层建筑结构抗震性能分析

发布时间：2018-09-11 07:50

【摘要】：地震是一种难以避免的突发性自然灾害,地球上每年大约发生500万次地震。多次强震后的经验总结表明,建筑结构的不规则性很大程度影响到地震所带来的危害大小。在城市里的的高层建筑因受地块形状和周边环境限制,其建筑方案往往可能存在各种不规则性。针对不规则高层建筑,需要采用多种力学模型进行抗震分析,以及采取弹性时程分析补充计算,必要时需进行罕遇地震下的弹塑性分析。本文通过工程实例的结构抗震分析,通过不规则建筑的判定,通过TAT、SATWE、PMSAP三种不同力学模型抗震分析的对比,选用合适的力学模型计算地震作用。首先针对薄弱层的竖向不规则,调整薄弱部位上下层之间的层刚度比,通过抗震计算分析能使整个建筑结构的抗震性能有所改善,然后对竖向不规则高层建筑采用弹性时程分析和罕遇地震下的弹塑性分析,保证整个不规则高层建筑在多遇地震和罕遇地震作用下的抗震性能。继而从调整不规则建筑的薄弱层和竖向收进层在竖向方向的位置,进行了多个方案的抗震计算,选择了振型、周期、层间位移比等参数的对比分析。最后,根据论文研究分析结果,总结了竖向不规则高层建筑的设计时的结构调整思路,使之更有具有更好结构的抗震性能。
[Abstract]:Earthquake is an inevitable sudden natural disaster. There are about 5 million earthquakes on earth every year. The conclusion of experience after several strong earthquakes shows that the irregularity of building structure greatly affects the damage caused by earthquake. Due to the limitation of land shape and surrounding environment, high-rise buildings in cities may have various irregularity. For irregular high-rise buildings, it is necessary to use a variety of mechanical models for seismic analysis, as well as elastic time history analysis to supplement the calculation, and when necessary, the elastoplastic analysis under rare earthquakes is necessary. In this paper, through the seismic analysis of structures of engineering examples, the judgement of irregular buildings and the comparison of seismic analysis of three different mechanical models of TAT,SATWE,PMSAP, the appropriate mechanical models are selected to calculate the earthquake action. Firstly, aiming at the vertical irregularity of the weak layer, adjusting the stiffness ratio between the upper and lower floors of the weak part, the seismic performance of the whole building structure can be improved by seismic analysis. Then elastic time-history analysis and elastic-plastic analysis under rare earthquake are used to ensure the seismic behavior of the whole irregular high-rise building under the action of frequent and rare earthquakes. Then through adjusting the position of the weak story and the vertical intake layer in the vertical direction of irregular building, the seismic calculation of several schemes is carried out, and the comparison and analysis of the parameters such as mode, period and the ratio of interstory displacement are carried out. Finally, according to the results of research and analysis in this paper, the structural adjustment ideas of vertical irregular high-rise buildings are summarized to make them have better seismic performance.
【学位授予单位】：西安建筑科技大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TU973.31

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