约束砌体结构地震易损性研究
发布时间：2018-09-12 19:41
【摘要】：我国大震频发,近年来数次大地震给人民生命财产带来了巨大的损失。地震中,建筑物的破坏是造成人民生命财产损失的主要原因。近年来,约束砌体结构以其优良的抗震性能被推广应用,但是尽管约束砌体结构较无筋砌体结构的抗震性能有了明显提升,在地震中约束砌体结构遭到破坏的现象也有发生。为了了解约束砌体结构的抗震性能,服务于约束砌体结构的抗震设防工作,本文从地震易损性的角度着手对约束砌体结构进行研究,主要进行了以下工作:1.概述国内外易损性的研究发发展和现状,介绍易损性分析常用的两种理论方法(基于pushover的反应谱法和IDA时程分析法)。2.从构造特性、破坏过程、破坏等级划分、影响约束砌体结构抗震性能的主要因素和破坏类型等方面对约束砌体结构进行了研究;参考相关文献,给出了本文分析使用的恢复力模型;从实际震害情况着眼提出了对约束砌体结构进行易损性研究的实际意义。3.通过IDA时程分析,对22个算例进行了易损性分析,得出结构的易损性曲线,结果表明结构满足“小震不坏、中震可修、大震不倒”的抗震设防目标,但是约束砌体结构不足以保证巨震(超过设防烈度2度)作用下的结构安全。分析了约束砌体结构易损性的影响因素,指出了层高、层数、砂浆强度、抗震墙体面积率、约束柱抗剪力比和场地条件对易损性的影响。着重研究了抗震墙体面积率和约束柱抗剪力比对约束砌体结构易损性的影响,并指出对约束砌体结构的抗剪承载力进行计算时,必须考虑约束柱的贡献。提出了约束砌体结构地震易损性评估参数Δ。4.提出了烈度修正系数θi,根据约束砌体结构易损性评估参数Δ和烈度修正系数θi,提出某个约束砌体结构的地震易损性简化分析方法。考虑约束柱对约束砌体结构抗剪承载力的贡献,给出了约束砌体结构抗震墙体面积率和约束柱抗剪力比与破坏等级的关系式和关系图。通过统计区域内约束砌体结构抗震墙体面积率和约束柱抗剪力比的分布,结合关系图,提出了区域约束砌体结构地震易损性简化分析方法。
[Abstract]:Great earthquakes occur frequently in China. In recent years, several earthquakes have brought huge losses to people's lives and property. In the earthquake, the destruction of buildings is the main cause of the loss of people's lives and property. In recent years, confined masonry structures have been widely used for their excellent seismic performance, but the seismic performance of confined masonry structures has been obviously improved compared with that of unreinforced masonry structures, and the failure of confined masonry structures has also occurred in earthquake. In order to understand the seismic behavior of confined masonry structures and serve the seismic fortification of confined masonry structures, this paper studies the confined masonry structures from the point of view of seismic vulnerability. This paper summarizes the development and present situation of vulnerability research at home and abroad, and introduces two common theoretical methods for vulnerability analysis (response spectrum method based on pushover and IDA time-history analysis method) .2. The structural characteristics, failure process, classification of failure grades, main factors affecting seismic behavior of confined masonry structures and failure types are studied. The restoring force model used in this paper is given, and the practical significance of studying the vulnerability of confined masonry structure is put forward from the view of actual earthquake damage. Through IDA time history analysis, the vulnerability of 22 examples is analyzed, and the structural vulnerability curve is obtained. The results show that the structure meets the seismic fortification goal of "small earthquake is not bad, medium earthquake is repairable, large earthquake is not collapsed". But the confined masonry structure is not enough to guarantee the safety of the structure under the action of giant earthquake (above fortification intensity of 2 degrees). The factors affecting the vulnerability of confined masonry structures are analyzed. The influences of story height, the number of stories, mortar strength, seismic wall area ratio, shear ratio of confined columns and site conditions on the vulnerability are pointed out. In this paper, the influence of seismic wall area ratio and shear ratio of confined columns on the vulnerability of confined masonry structures is studied, and it is pointed out that the contribution of confined columns must be taken into account in the calculation of shear bearing capacity of confined masonry structures. The seismic vulnerability evaluation parameter 螖. 4 of confined masonry structures is proposed. The intensity correction coefficient 胃 I is put forward. According to the evaluation parameter 螖 and the intensity correction coefficient 胃 I of the confined masonry structure, a simplified method for seismic vulnerability analysis of a confined masonry structure is proposed. Considering the contribution of confined columns to the shear bearing capacity of confined masonry structures, the relationship between the area ratio of seismic walls of confined masonry structures, the shear ratio of restrained columns and the failure grade is given. A simplified analysis method for seismic vulnerability of confined masonry structures is presented by statistical analysis of the distribution of seismic wall area rate and shear ratio of confined columns in the region, and the relationship diagram is used to analyze the seismic vulnerability of confined masonry structures.
【学位授予单位】：中国地震局工程力学研究所
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：P315.9
本文编号：2240034
[Abstract]:Great earthquakes occur frequently in China. In recent years, several earthquakes have brought huge losses to people's lives and property. In the earthquake, the destruction of buildings is the main cause of the loss of people's lives and property. In recent years, confined masonry structures have been widely used for their excellent seismic performance, but the seismic performance of confined masonry structures has been obviously improved compared with that of unreinforced masonry structures, and the failure of confined masonry structures has also occurred in earthquake. In order to understand the seismic behavior of confined masonry structures and serve the seismic fortification of confined masonry structures, this paper studies the confined masonry structures from the point of view of seismic vulnerability. This paper summarizes the development and present situation of vulnerability research at home and abroad, and introduces two common theoretical methods for vulnerability analysis (response spectrum method based on pushover and IDA time-history analysis method) .2. The structural characteristics, failure process, classification of failure grades, main factors affecting seismic behavior of confined masonry structures and failure types are studied. The restoring force model used in this paper is given, and the practical significance of studying the vulnerability of confined masonry structure is put forward from the view of actual earthquake damage. Through IDA time history analysis, the vulnerability of 22 examples is analyzed, and the structural vulnerability curve is obtained. The results show that the structure meets the seismic fortification goal of "small earthquake is not bad, medium earthquake is repairable, large earthquake is not collapsed". But the confined masonry structure is not enough to guarantee the safety of the structure under the action of giant earthquake (above fortification intensity of 2 degrees). The factors affecting the vulnerability of confined masonry structures are analyzed. The influences of story height, the number of stories, mortar strength, seismic wall area ratio, shear ratio of confined columns and site conditions on the vulnerability are pointed out. In this paper, the influence of seismic wall area ratio and shear ratio of confined columns on the vulnerability of confined masonry structures is studied, and it is pointed out that the contribution of confined columns must be taken into account in the calculation of shear bearing capacity of confined masonry structures. The seismic vulnerability evaluation parameter 螖. 4 of confined masonry structures is proposed. The intensity correction coefficient 胃 I is put forward. According to the evaluation parameter 螖 and the intensity correction coefficient 胃 I of the confined masonry structure, a simplified method for seismic vulnerability analysis of a confined masonry structure is proposed. Considering the contribution of confined columns to the shear bearing capacity of confined masonry structures, the relationship between the area ratio of seismic walls of confined masonry structures, the shear ratio of restrained columns and the failure grade is given. A simplified analysis method for seismic vulnerability of confined masonry structures is presented by statistical analysis of the distribution of seismic wall area rate and shear ratio of confined columns in the region, and the relationship diagram is used to analyze the seismic vulnerability of confined masonry structures.
【学位授予单位】：中国地震局工程力学研究所
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：P315.9
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