RC框架结构地震倒塌判定准则分析

发布时间：2018-10-24 10:02

【摘要】：避免结构的倒塌是工程结构设计的重点之一，需建立比较合理的结构倒塌判定准则，来描述结构的倒塌，，以方便学者更加深入的研究结构抗倒塌方法。国内外的框架结构倒塌判定准则很多，但在实际应用时如何选择倒塌判定准则没有定论，确定一个比较合理的结构倒塌判定准则选择方法迫不及待。本文对已有钢筋混凝土框架结构倒塌判定准则进行综述和分析总结，并选择本文需要对比的几类倒塌判定准则。以钢筋混凝土平面框架结构拟静力倒塌试验为基础，用OpenSees有限元软件对该结构进行数值模拟，然后对比分析更能反映钢筋混凝土框架结构倒塌的判定准则。再利用OpenSees有限元软件建立一榀五层三跨平面框架数值分析模型，进行IDA（增量动力反应）分析，寻找IDA倒塌判定准则规定的倒塌点，再找出每条地震波在倒塌点处的地震动强度，并将此地震动强度下的地震波输入结构进行弹塑性时程分析，然后对比分析钢筋混凝土框架结构倒塌的准则。通过分析研究，本文初步得出以下主要结论： ①本文选择对比的四种钢筋混凝土框架结构倒塌判定准则都能在一定程度上判断结构的塑性发展程度，但不是都能准确说明结构是否进入倒塌或者接近倒塌点； ②基于变形的倒塌判定准则（层间位移角限值1/50），有低估结构抗倒塌能力的风险；基于刚度的倒塌判定准则（顾祥林建议准则），有低估结构应有损伤的风险；基于最大位移和能量的倒塌判定准则（Park-Ang建议准则），能准确的估计结构的倒塌点，与实际情况较为相符；基于IDA的倒塌判定准则（ATC-63建议准则），有低估结构应有损伤的风险； ③本文选择的基于变形的倒塌判定准则和基于刚度的倒塌判定准则计算较为方便，但不太能真实反映结构的倒塌，在计算不需要太精确的情况下这两种准则可以作为选择目标；本文选择的基于IDA的倒塌判定准则计算最复杂，并且不能准确判定结构是否进入倒塌，根据实际情况考虑选用；本文选择的基于最大位移和能量的倒塌判定准则，计算较为复杂，但是能比较准确的判断结构是否倒塌，在计算要求较为精确的情况，此准则可以作为选择目标。
[Abstract]:To avoid the collapse of structures is one of the key points in the design of engineering structures. It is necessary to establish more reasonable criteria for determining the collapse of structures to describe the collapse of structures, so as to facilitate scholars to study more deeply the methods of resisting collapse of structures. There are many criteria for determining the collapse of frame structures at home and abroad, but how to choose the criteria of collapse in practical application is not conclusive, so it is urgent to determine a more reasonable criterion for determining collapse of structures. In this paper, the existing criteria for judging the collapse of reinforced concrete frame structures are summarized and analyzed, and several kinds of criteria for judging collapse of reinforced concrete frame structures are selected which need to be compared in this paper. Based on the pseudostatic collapse test of reinforced concrete plane frame structure, the numerical simulation of the structure is carried out by using OpenSees finite element software, and then the criteria for judging the collapse of reinforced concrete frame structure are compared and analyzed. Then a five-story three-span plane frame numerical analysis model is established by using OpenSees finite element software. The IDA (incremental dynamic response) analysis is carried out to find the collapse point prescribed by the IDA collapse criterion, and then to find out the ground motion intensity of each seismic wave at the collapse point. The seismic wave input structure under the local vibration intensity is analyzed by elastic-plastic time-history analysis, and then the collapse criterion of reinforced concrete frame structure is compared and analyzed. Through analysis and research, the main conclusions are as follows: 1 the four criteria for judging collapse of reinforced concrete frame structures selected in this paper can judge the degree of plastic development of structures to a certain extent. But not all of them can accurately explain whether the structure enters or approaches the collapse point. 2 the collapse criterion based on deformation (the limit of displacement angle between floors is 1 / 50) has the risk of underestimating the ability of the structure to resist collapse. The collapse criterion based on stiffness (Gu Xianglin's suggestion criterion) has the risk of underestimating the damage due to the structure, and the collapse criterion based on the maximum displacement and energy (Park-Ang recommendation criterion) can accurately estimate the collapse point of the structure. The collapse criterion based on IDA (ATC-63 recommendation criterion) has the risk of underestimating the damage of the structure. (3) the collapsing criterion based on deformation and stiffness is convenient to calculate, but it can not really reflect the collapse of structure. These two criteria can be used as the choice targets when the calculation is not too accurate. The collapse criterion based on IDA is the most complicated one in this paper, and it can not accurately determine whether the structure is collapsing or not, so it can be selected according to the actual situation. In this paper, the criterion of collapse based on maximum displacement and energy is more complicated, but it can accurately judge whether the structure collapses or not. This criterion can be used as the choice target when the calculation requirement is more accurate.
【学位授予单位】：重庆大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TU311.3;TU375.4

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