【摘要】：我國大震頻發(fā),近年來數(shù)次大地震給人民生命財產(chǎn)帶來了巨大的損失。地震中,建筑物的破壞是造成人民生命財產(chǎn)損失的主要原因。近年來,約束砌體結(jié)構(gòu)以其優(yōu)良的抗震性能被推廣應(yīng)用,但是盡管約束砌體結(jié)構(gòu)較無筋砌體結(jié)構(gòu)的抗震性能有了明顯提升,在地震中約束砌體結(jié)構(gòu)遭到破壞的現(xiàn)象也有發(fā)生。為了了解約束砌體結(jié)構(gòu)的抗震性能,服務(wù)于約束砌體結(jié)構(gòu)的抗震設(shè)防工作,本文從地震易損性的角度著手對約束砌體結(jié)構(gòu)進(jìn)行研究,主要進(jìn)行了以下工作:1.概述國內(nèi)外易損性的研究發(fā)發(fā)展和現(xiàn)狀,介紹易損性分析常用的兩種理論方法(基于pushover的反應(yīng)譜法和IDA時程分析法)。2.從構(gòu)造特性、破壞過程、破壞等級劃分、影響約束砌體結(jié)構(gòu)抗震性能的主要因素和破壞類型等方面對約束砌體結(jié)構(gòu)進(jìn)行了研究;參考相關(guān)文獻(xiàn),給出了本文分析使用的恢復(fù)力模型;從實(shí)際震害情況著眼提出了對約束砌體結(jié)構(gòu)進(jìn)行易損性研究的實(shí)際意義。3.通過IDA時程分析,對22個算例進(jìn)行了易損性分析,得出結(jié)構(gòu)的易損性曲線,結(jié)果表明結(jié)構(gòu)滿足“小震不壞、中震可修、大震不倒”的抗震設(shè)防目標(biāo),但是約束砌體結(jié)構(gòu)不足以保證巨震(超過設(shè)防烈度2度)作用下的結(jié)構(gòu)安全。分析了約束砌體結(jié)構(gòu)易損性的影響因素,指出了層高、層數(shù)、砂漿強(qiáng)度、抗震墻體面積率、約束柱抗剪力比和場地條件對易損性的影響。著重研究了抗震墻體面積率和約束柱抗剪力比對約束砌體結(jié)構(gòu)易損性的影響,并指出對約束砌體結(jié)構(gòu)的抗剪承載力進(jìn)行計算時,必須考慮約束柱的貢獻(xiàn)。提出了約束砌體結(jié)構(gòu)地震易損性評估參數(shù)Δ。4.提出了烈度修正系數(shù)θi,根據(jù)約束砌體結(jié)構(gòu)易損性評估參數(shù)Δ和烈度修正系數(shù)θi,提出某個約束砌體結(jié)構(gòu)的地震易損性簡化分析方法�？紤]約束柱對約束砌體結(jié)構(gòu)抗剪承載力的貢獻(xiàn),給出了約束砌體結(jié)構(gòu)抗震墻體面積率和約束柱抗剪力比與破壞等級的關(guān)系式和關(guān)系圖。通過統(tǒng)計區(qū)域內(nèi)約束砌體結(jié)構(gòu)抗震墻體面積率和約束柱抗剪力比的分布,結(jié)合關(guān)系圖,提出了區(qū)域約束砌體結(jié)構(gòu)地震易損性簡化分析方法。
[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.
【學(xué)位授予單位】：中國地震局工程力學(xué)研究所
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：P315.9

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