本文選題：鋼筋混凝土框架結(jié)構(gòu) + 逐步動力增量時程分析　； 參考：《清華大學(xué)》2015年博士論文

【摘要】：本文以鋼筋混凝土框架結(jié)構(gòu)為研究對象,以結(jié)構(gòu)在設(shè)計年限內(nèi)的一致倒塌風(fēng)險為研究目標,對RC框架的抗地震倒塌安全性能進行了系統(tǒng)的研究。主要研究內(nèi)容如下:(1)采用基于IDA的倒塌易損性分析方法,定量評價了按我國現(xiàn)行建筑抗震設(shè)計方法設(shè)計的40個RC框架結(jié)構(gòu)的抗地震倒塌能力。我國RC框架結(jié)構(gòu)的抗倒塌安全儲備系數(shù)CMR主要分布在2.0與3.5之間,地震動隨機性引起抗地震倒塌能力的不確定性?RTR主要分布在0.40與0.55之間。(2)通過分析40個RC框架結(jié)構(gòu)在44條地震動作用下的倒塌模式,發(fā)現(xiàn)框架柱在地震作用下喪失豎向承載力,繼而導(dǎo)致上部結(jié)構(gòu)在重力作用下發(fā)生豎向連續(xù)倒塌破壞,是框架結(jié)構(gòu)在地震作用下最主要的倒塌模式。多層RC框架結(jié)構(gòu)的地震倒塌破壞主要始于底部樓層,結(jié)構(gòu)的一階地震響應(yīng)對多層RC框架的地震倒塌破壞起控制作用。(3)論述了結(jié)構(gòu)抗地震倒塌能力的不確定性來源,應(yīng)用中心點法定量估計了結(jié)構(gòu)模型參數(shù)不確定性對結(jié)構(gòu)抗倒塌能力的影響。(4)全面考慮結(jié)構(gòu)所在場地的地震危險性,以結(jié)構(gòu)在設(shè)計年限內(nèi)的地震倒塌風(fēng)險作為結(jié)構(gòu)抗倒塌安全性能的度量,并給出了地震倒塌風(fēng)險的定義和計算方法,在此基礎(chǔ)上介紹了“一致倒塌風(fēng)險”的抗震設(shè)計目標。結(jié)合我國第五代抗震設(shè)防區(qū)劃,以P(collapse|Sa(T1)罕遇地震)10%和Pc,50年1.0%分別作為“大震不倒”和“一致倒塌風(fēng)險”的定量目標,給出結(jié)構(gòu)抗地震倒塌能力的目標。(5)利用基于IDA的倒塌易損性方法定量評價了SDOF結(jié)構(gòu)的抗地震倒塌能力,并提出了結(jié)構(gòu)抗地震倒塌譜。采用抗地震倒塌能力譜,系統(tǒng)研究了結(jié)構(gòu)特性和地震動特性對SDOF體系抗地震倒塌能力的影響。(6)提出了基于SDOF結(jié)構(gòu)的倒塌易損性簡化預(yù)測方法,并給出了分析流程。通過40個多層RC框架的分析表明,本文建議的基于等效SDOF結(jié)構(gòu)的倒塌易損性預(yù)測方法能夠?qū)Χ鄬右?guī)則RC框架的抗地震倒塌能力作出保守估計。
[Abstract]:Taking the reinforced concrete frame structure as the research object and taking the consistent collapse risk of the structure within the design years as the research goal, the safety performance of the RC frame against earthquake collapse is studied systematically in this paper. The main contents of this paper are as follows: (1) the collapse vulnerability analysis method based on IDA is used to quantitatively evaluate the earthquake collapse resistance of 40 RC frame structures designed according to the current seismic design method of buildings in China. The anti-collapse safety reserve coefficient (CMR) of RC frame structures in China is mainly distributed between 2.0 and 3.5. The uncertainty of earthquake collapse resistance caused by random ground motion (RTR) is mainly distributed between 0.40 and 0.55. By analyzing the collapse modes of 40 RC frame structures under the action of 44 ground motions, it is found that the vertical bearing capacity of frame columns is lost under earthquake action. The vertical continuous collapse and failure of the superstructure under the action of gravity is the main collapse mode of the frame structure under earthquake. The earthquake collapse failure of multi-story RC frame structure mainly begins at the bottom floor. The first-order seismic response of the structure controls the earthquake collapse damage of the multi-story RC frame. The influence of structural model parameter uncertainty on the collapse resistance of the structure is estimated quantitatively by using the center point method. (4) the seismic risk of the site of the structure is considered comprehensively. Taking the seismic collapse risk of the structure in the design life as the measure of the structural anti-collapse safety performance, the definition and calculation method of the seismic collapse risk are given, and the seismic design goal of "consistent collapse risk" is introduced. In combination with the fifth generation seismic fortification regionalization in China, 10% and 1.0% rare earthquakes are regarded as the quantitative targets of "strong earthquakes do not fail" and "consistent collapse risk" respectively in 50 years. The objective of anti-collapse ability of structures is given. (5) the seismic collapse resistance of SDOF structures is quantitatively evaluated by using the method of collapse vulnerability based on IDA, and the seismic collapse spectrum of structures is proposed. The influence of structural characteristics and ground motion characteristics on the seismic collapse resistance of SDOF system is systematically studied by using the seismic collapse resistance spectrum. A simplified prediction method of collapse vulnerability based on SDOF structure is proposed, and the analysis flow is given. The analysis of 40 multi-story RC frames shows that the proposed collapse vulnerability prediction method based on equivalent SDOF structure can conservatively estimate the seismic collapse resistance of multi-story regular RC frames.
【學(xué)位授予單位】：清華大學(xué)
【學(xué)位級別】：博士
【學(xué)位授予年份】：2015
【分類號】：TU375.4;TU352.11

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本文編號：1892858