【摘要】：研究結(jié)構(gòu)在不同特性地震激勵作用下的逐步倒塌機制以及整體損傷演化規(guī)律,可以為結(jié)構(gòu)抗連續(xù)倒塌設計和控制提供一種新的研究思路�？紤]到地震動的隨機性對結(jié)構(gòu)響應造成的變異性,及不同損傷模型對結(jié)構(gòu)失效形態(tài)的影響。為此,有必要對不同特性地震激勵作用下的結(jié)構(gòu)失效模式進行統(tǒng)計分析,并得出一個具有統(tǒng)計意義的結(jié)論。主余震序列型地震動對結(jié)構(gòu)的最大危害在于主震作用下結(jié)構(gòu)已經(jīng)產(chǎn)生很大的損傷,由于余震的累積損傷效應,余震的作用可能會增加結(jié)構(gòu)的損傷,改變結(jié)構(gòu)的失效模式,甚至造成結(jié)構(gòu)的倒塌。因此,如何對余震作用下結(jié)構(gòu)的附加損傷進行量化評估,分析主余震序列型地震動對結(jié)構(gòu)的失效模式的影響,已成為工程抗震中的一個重要問題。 本文基于OpenSees平臺對鋼筋混凝士結(jié)構(gòu)進行IDA分析,首先采用不同截面損傷模型研究結(jié)構(gòu)在不同地震動作用下的失效模式,基于加權(quán)秩和比的統(tǒng)計方法得到一組新的失效模式,并引入相似度概念來描述統(tǒng)計得到的失效模式與最弱失效模式的差異性。其次研究不同超越概率下的余震對結(jié)構(gòu)失效模式的影響,并重新定義地震作用下結(jié)構(gòu)的損傷率,最后基于概率地震需求模型對結(jié)構(gòu)在余震作用下的附加損傷進行概率損傷評估。 通過以上研究表明：不同截面損傷模型得到的失效模式大體相近；基于規(guī)范設計反應潛,當輸入的不同地震動之間的離散性較小時,首個失效截面位置都相同；統(tǒng)計得到的失效模式與最弱失效模式有著較大的差異,前者具有統(tǒng)計意義。隨著余震超越概率的增大,余震對結(jié)構(gòu)的累積損傷越來越顯著,結(jié)構(gòu)設計中不容忽視；相比主震作用下結(jié)構(gòu)失效的截面數(shù)量,結(jié)構(gòu)在主余震序列型地震動作用下并一定會增加大量的截面失效；結(jié)構(gòu)遭受的主震損傷率較大時,控制結(jié)構(gòu)的倒塌與余震的等級無關。
[Abstract]:The study of the progressive collapse mechanism of structures under different characteristics of earthquake excitation and the law of overall damage evolution can provide a new research idea for the design and control of continuous collapse of structures. Considering the variability caused by the randomness of ground motion to the structural response, and the influence of different damage models on the failure form of the structure. Therefore, it is necessary to make a statistical analysis of the failure modes of structures under different characteristics of earthquake excitation, and draw a conclusion of statistical significance. The greatest damage to the structure caused by the main aftershock sequence ground motion is that the structure has already caused great damage under the action of the main shock. Because of the cumulative damage effect of the aftershock, the aftershock action may increase the damage of the structure and change the failure mode of the structure. Even caused the collapse of the structure. Therefore, how to quantitatively evaluate the additional damage of the structure under aftershock and analyze the influence of the sequence ground motion of the main aftershock on the failure mode of the structure has become an important problem in the engineering earthquake resistance. In this paper, based on the OpenSees platform, the reinforced concrete structure is analyzed by IDA. Firstly, different section damage models are used to study the failure modes of the structures under different ground motions, and a set of new failure modes are obtained based on the statistical method of weighted rank sum ratio. The concept of similarity is introduced to describe the difference between the statistical failure mode and the weakest failure mode. Secondly, the effects of aftershocks under different transcendental probabilities on the failure modes of structures are studied, and the damage rate of structures under earthquake action is redefined. Finally, the probabilistic damage assessment of structures under aftershocks is carried out based on probabilistic seismic demand model. The above results show that the failure modes obtained by different section damage models are approximately similar, and the first failure section positions are the same when the discreteness of the input different ground motions is small, and the response potential based on the specification design is similar. There is a great difference between the statistical failure mode and the weakest failure mode, the former has statistical significance. With the increase of the probability of aftershock transcendence, the cumulative damage of aftershock to the structure becomes more and more significant, and the structure design can not be ignored. Compared with the number of structural failure sections under the action of the main shock, the structure will increase a lot of section failure under the action of the main aftershock sequence ground motion, and when the damage rate of the main shock is larger, the collapse of the control structure is independent of the magnitude of the aftershock.
【學位授予單位】：大連理工大學
【學位級別】：碩士
【學位授予年份】：2013
【分類號】：TU312.3

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