考虑P-Δ效应的大震下RC框架结构抗整体倒塌能力评估及残余侧移分析

发布时间：2018-02-08 20:22

本文关键词： P-△效应抗整体倒塌能力评估残余侧移静力推覆分析增量动力分析钢筋混凝土框架　出处：《兰州理工大学》2013年硕士论文　论文类型：学位论文

【摘要】：地震是人类面临的最严重的自然灾害之一。建筑结构在地震作用下会产生相应的内力和变形,当内力和变形达到结构的倒塌极限状态时,建筑结构就会倒塌。在地震作用下,建筑物的倒塌是造成人员伤亡和财产损失的主要原因。究其原因,建筑结构的倒塌是内因和外因共同作用的结果,如结构构件强度和刚度的退化,P-△效应及地震动强度等。本文首先分析了P-△效应对钢筋混凝土框架结构抗整体倒塌能力的影响。先对一六层RC框架结构进行PKPM建模设计,根据设计结果,利用OpenSees分析软件对其中一榀RC平面框架进行了非线性分析,主要工作及结论如下： (1)区分不考虑和考虑P-△效应两种情况,对模型进行静力推覆分析,对比两种情况下的RC框架结构的基底剪力-顶点位移曲线的异同。 (2)区分不考虑和考虑P-△效应两种情况,选取多条地震动记录,对模型进行增量动力分析,得到结构在上述两种情况下的抗倒塌能力。通过对比可以看出,P-△效应对结构的倒塌能力有显著影响,是导致建筑结构倒塌的一个重要原因。在大震作用下,有些建筑物没有倒塌但产生了过大的残余侧移,这些建筑物在灾后重建修复的技术和费用都有很大的增加,有些甚至不得不拆除,因此,有效地控制残余侧移是非常重要的。本文通过选取多条地震动记录,对RC框架结构的残余侧移进行了分析,主要工作及结论如下： (1)通过对基于RC框架结构残余侧移的两种地震动强度指标进行对比分析,得出以基本周期的谱加速度作为地震动强度指标能够降低结构响应的离散性。 (2)分别分析了特定层的最大层间位移角与残余层间位移角,得出两者有很好的相关性。 (3)分析了特定层的残余层间位移角随最大层间位移角的增长过程,得出随着最大层间位移角的增大,残余层间位移角增长速率加快。 (4)分别分析了基于弹塑性层间位移角限值和倒塌临界状态最大层间位移角时的残余层间位移角,得出在结构的最大层间位移角超过弹塑性层间位移角限值之后,结构还有很大的塑性发展。
[Abstract]:Earthquake is one of the most serious natural disasters that human face. Under earthquake, the building structure will produce corresponding internal force and deformation, when the internal force and deformation reach the limit state of collapse, the building structure will collapse. The collapse of buildings is the main cause of casualties and property losses. For example, the degradation of strength and stiffness of structural members, P- effect and ground motion intensity, etc. In this paper, the influence of P- effect on the overall collapse resistance of reinforced concrete frame structures is first analyzed. First, the PKPM modeling design of a six-story RC frame structure is carried out. According to the design results, the nonlinear analysis of one RC plane frame is carried out by using OpenSees analysis software. The main work and conclusions are as follows:. In this paper, the static force nappe analysis of the model is carried out, and the similarities and differences between the shear and vertex displacement curves of the RC frame structure are compared. (2) in this paper, the incremental dynamic analysis of the model is carried out, and the anti-collapse ability of the structure under the above two conditions is obtained by selecting a number of seismic records and analyzing the incremental dynamics of the model without considering or considering the P- effect. It can be seen from the comparison that the P- effect has a significant influence on the collapse capacity of the structure and is an important reason for the collapse of the building structure. As a result of the earthquake, some buildings did not collapse but resulted in excessive residual sideways, and the technology and cost of reconstruction and restoration of these buildings increased significantly after the disaster, and some even had to be demolished, so, It is very important to control the residual lateral displacement effectively. In this paper, the residual lateral displacement of RC frame structure is analyzed by selecting multiple seismic records. The main work and conclusions are as follows:. 1) by comparing and analyzing two kinds of ground motion intensity indexes based on residual lateral displacement of RC frame structure, it is concluded that spectral acceleration of basic period as index of ground motion intensity can reduce the discreteness of structural response. 2) the maximum interstory displacement angle and the residual layer displacement angle are analyzed, and a good correlation between them is obtained. 3) the growth process of residual layer displacement angle with the maximum interstory displacement angle is analyzed. It is concluded that the increase rate of residual layer displacement angle increases with the increase of the maximum interstory displacement angle. The residual interlayer displacement angle is analyzed based on the limit value of elastic-plastic interstory displacement angle and the maximum interstory displacement angle of collapse critical state, and it is obtained that when the maximum interstory displacement angle of the structure exceeds the elastic-plastic interstory displacement angle limit, There is still a lot of plastic development in the structure.
【学位授予单位】：兰州理工大学
【学位级别】：硕士
【学位授予年份】：2013
【分类号】：TU375.4

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