基于Pushover的RC框架结构抗侧向倒塌能力分析

发布时间：2018-04-14 22:28

本文选题：RC框架结构 + Pushover分析　；参考：《西南交通大学》2017年硕士论文

【摘要】：在地震发生的过程中,给人民的生命财产造成灾害的最主要的根源是房屋建筑在地震作用下的严重破坏和倒塌。我国目前按照"两阶段三水准"的抗震设计准则,采用两阶段设计方法满足不同水准的抗震设防要求。在计算地震作用时,以线弹性设计方法计算结构在多遇地震下的内力、位移,并用内力组合验算构件截面以实现结构的功能需求。而地震倒塌计算一般只针对于少数重要性等级较高的建筑结构,对大量的一般建筑结构来说,其抗倒塌能力主要依赖整体结构的抗震概念设计和抗震构造措施,缺乏定量计算的方法和评价指标。因此,定量地研究结构在地震作用下的抗侧向倒塌能力具有重要意义。本文基于Pushover方法,对严格按照我国规范设计的RC框架结构进行了抗侧向倒塌能力的定量分析,具体内容如下:(1)严格按照我国现行抗震规范设计了 11个在不同抗震设防烈度下的5层和8层RC框架结构,利用有限元分析软件SAP2000对各框架进行了 3种不同侧向力加载模式下的Pushover分析。(2)利用分析得到的基底剪力-顶点位移曲线,从承载力储备和变形能力两个方面建立了结构整体超强系数、强屈比、延性系数和延展系数四个性能参数来定量分析结构的抗侧向倒塌能力。(3)对比计算得到的性能参数,总结出了抗震设防烈度、层数对结构性能参数的影响,定量评价了各结构的抗侧向倒塌能力。得到的结论有:不同侧向力加载模式对结构的抗侧向倒塌能力有较大影响;从总体趋势来看,结构超强系数的平均值随着结构抗震设防烈度的提高而减小;严格按我国规范设计的RC框架结构的超强系数最小值为1.3;在不同的抗震设防烈度下,各结构强屈比的平均值均不小于我国规范规定的钢筋强屈比最小限值1.25;结构整体延性系数在3.8～5.3之间,延展系数在1.7～2.1之间。
[Abstract]:In the process of earthquake, the main source of disaster to people's life and property is the serious destruction and collapse of buildings under the action of earthquake.According to the criterion of "two-stage and three-level" seismic design, the two-stage design method is adopted to meet the requirements of seismic fortification at different levels in China.The linear elastic design method is used to calculate the internal force and displacement of the structure under the frequent earthquake, and the internal force is combined to calculate the section of the member in order to meet the functional requirements of the structure.But the calculation of earthquake collapse is usually aimed at a few building structures with high importance level. For a large number of general building structures, their ability to resist collapse mainly depends on the seismic conceptual design and seismic structural measures of the whole structure.Lack of quantitative calculation methods and evaluation indicators.Therefore, it is of great significance to quantitatively study the lateral collapse resistance of structures under earthquake.Based on the Pushover method, the lateral collapse resistance of RC frame structures designed in strict accordance with the code of our country is quantitatively analyzed in this paper.The concrete contents are as follows:) 11 RC frame structures with 5 or 8 stories under different seismic fortification intensity have been designed in strict accordance with the current seismic code of our country.Using the finite element analysis software SAP2000, the Pushover analysis of each frame under three different lateral loading modes is carried out. (2) the base shear-vertex displacement curve is obtained by using the analysis.From the two aspects of bearing capacity reserve and deformation capacity, the performance parameters of the whole structure are established to quantitatively analyze the lateral collapse resistance of the structure, such as the superstrength coefficient, the strong yield ratio, the ductility coefficient and the extension coefficient.The effects of seismic fortification intensity and the number of layers on the structural performance parameters are summarized and the lateral collapse resistance of each structure is quantitatively evaluated.The conclusions are as follows: different lateral force loading modes have great influence on the lateral collapse resistance of the structure, and the average value of the superstrength coefficient of the structure decreases with the increase of the seismic fortification intensity of the structure.The minimum value of superstrength coefficient of RC frame structure designed strictly according to the code of our country is 1.3. Under different seismic fortification intensity,The average strength to yield ratio of each structure is not less than the minimum limit of reinforcement strength to yield ratio of 1.25, the ductility coefficient of the whole structure is between 3.810 and 5.3, and the extension coefficient is between 1.7 and 2.1.
【学位授予单位】：西南交通大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TU375.4

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