基于能量方法设计的人字形中心支撑钢框架抗近场地震倒塌富余度

发布时间：2018-01-15 05:34

本文关键词：基于能量方法设计的人字形中心支撑钢框架抗近场地震倒塌富余度　出处：《苏州科技大学》2017年硕士论文　论文类型：学位论文

【摘要】：为提高结构的抗地震倒塌性能,国内外学者考虑结构的性态及能量耗散能力提出了不同的结构性态设计方法。宋彬[1]基于最大有效滞回耗能谱提出了近场地震下人字形中心支撑钢框架基于能量的性态设计方法,并给出了两个设计实例。但其设计方法是否可信,所设计结构的抗地震倒塌能力如何,其倒塌概率是否为社会可接受,都未进行研究。为评估文献【1】基于能量性态设计方法的可行性,本文对按上述方法设计的两个人字形中心支撑钢框架进行了抗地震倒塌能力和易损性分析。文中介绍了结构抗地震倒塌能力的研究现状及倒塌富余系数CMR方法的原理、增量动力分析方法的步骤;根据人字形中心支撑钢框架的试验数据提出了结构倒塌判定指标;根据倒塌判定准则及倒塌指标,对按上述方法设计的两个CBSF结构进行了增量动力分析;依据美国FEMAP695中的方法及建议的地震波数据库分析了两个CBSF结构的抗地震倒塌能力,给出了两个结构在不同地面运动强度下的易损性曲线;根据结构薄弱层的位置提出该性态设计应进一步优化结构倒塌模式,并给出改进思路。本文分析表明:宋彬[1]按基于近场地震有效滞回耗能方法设计的两个人字形中心支撑钢框架抗地震倒塌能力及倒塌概率均达到FEMAP695的抗倒塌储备要求,满足社会可接受水平,此设计方法可信。两个结构的设计方法虽然完全相同,但两者的抗倒塌能力还是有一定差别:随着结构高度的增加,结构抗地震倒塌富余度减小,倒塌概率增大;且随着地震强度增大,两者抗倒塌能力差异也逐渐增大,即该设计方法尚有一定优化空间。
[Abstract]:In order to improve the anti earthquake collapse performance, the domestic and foreign scholars consider the structure behavior and energy dissipation capacity put forward the structural design of different methods. The song bin [1] maximum effective hysteretic energy spectra is presented near field earthquake human shaped steel braced frame state design method based on energy, and gives two design examples. But its design method is credible, the seismic collapse resistance of the structure, whether the collapse probability is acceptable to the society, are not studied. To evaluate the literature [1] Based on the feasibility of energy performance design method, this paper according to the design method of the two chevron steel braced frame the analysis of seismic collapse resistance and vulnerability. This paper introduces the principle of seismic collapse resistance of the structure and the collapse of the surplus coefficient CMR method, incremental dynamic analysis method of step According to the test data; chevron braced steel frame structure was put forward according to the collapse criteria; collapse criterion and collapse index, of the two CBSF structure according to the design method of incremental dynamic analysis; on the basis of methods and suggestions in the United States FEMAP695 seismic database to analyze the seismic collapse resistance of two CBSF the structure, the vulnerability curves of two structures in different ground motion intensities are given; according to the position of the weak layer structure of state should be designed to further optimize the structure collapse mode, and gives the improvement ideas. The analysis shows that the song bin [1] near field earthquake by effective hysteretic energy design method of two chevrons steel braced frame seismic collapse resistance and collapse probability based on FEMAP695 reached the anti collapse reserve requirements, meet the social acceptable level, this design method is credible. The end of the two Although the design method of structure exactly the same, but the ability of anti collapse are different: with the increase of the height of structure, structural collapse surplus decreased, collapse probability increases; and with the increase of earthquake intensity, the anti collapse capacity difference is increased gradually, the design method has some optimization space.

【学位授予单位】：苏州科技大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TU391;TU352.11

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