本文選題：RC框架結(jié)構(gòu) + 增量動力分析��； 參考：《西安建筑科技大學》2015年碩士論文

【摘要】：鋼筋混凝土(RC)框架結(jié)構(gòu)在我國目前的結(jié)構(gòu)形式中占了相當大的比例,其抗地震倒塌能力是保障人民生命財產(chǎn)安全的重要指標。我國現(xiàn)存的大量鋼筋混凝土框架結(jié)構(gòu)原設計的依據(jù)標準過低,加上耐久性及損傷積累等因素使得結(jié)構(gòu)的承載力有所降低。如何合理評估建筑結(jié)構(gòu)的抗地震倒塌能力成為重要的前沿課題,迫切需要發(fā)展一套指標來定量評估建筑結(jié)構(gòu)的抗地震倒塌能力,使得抗震能力不足的建筑結(jié)構(gòu)能及早加固或拆除,在最大程度上保證結(jié)構(gòu)“大震不倒”�？紤]到抗倒塌分析一般需要進行動力彈塑性時程分析,耗時較長且建模過程繁瑣,這對大量的既有建筑是不切實際的。因此,本文基于增量動力分析方法,提出一個簡化的抗倒塌評估指標,僅通過簡單的計算即可對結(jié)構(gòu)的抗地震倒塌能力進行定量評估。主要研究工作和成果如下:(1)對按照我國現(xiàn)行抗震規(guī)范設計的設防烈度8度區(qū)的RC框架結(jié)構(gòu)進行易損性分析,在預期的罕遇地震強度下對倒塌性能進行了定量評估。結(jié)果表明,按照我國現(xiàn)行抗震規(guī)范設計的RC框架結(jié)構(gòu),可以滿足在預期的罕遇地震下結(jié)構(gòu)的抗地震倒塌要求,發(fā)生倒塌的概率較小,對人身安全有較充分的保障。(2)分析比較了基于PERFORM-3D的纖維模型和塑性鉸模型。結(jié)果表明,二者的結(jié)構(gòu)響應基本相同,對結(jié)構(gòu)的倒塌性能評估影響差異較小,考慮到建模的方便性和評估的可靠性,推薦采用纖維模型。(3)討論了“強柱弱梁”對結(jié)構(gòu)抗倒塌性能的影響,通過調(diào)整柱、梁抗彎承載力比c b?M/?M來考慮這種變化。結(jié)果表明,柱、梁抗彎承載力比對結(jié)構(gòu)的抗倒塌性能影響顯著,并確定了對應于基準建筑的最優(yōu)比值。(4)討論了“強剪弱彎”對結(jié)構(gòu)抗倒塌性能的影響,通過調(diào)整箍筋間距及配置改變參數(shù)p uV/V來考慮這種變化。分析結(jié)果表明,p uV/V的變化對結(jié)構(gòu)的抗倒塌性能也有一定的影響。(5)綜合上述兩個參數(shù),分析其對結(jié)構(gòu)抗倒塌性能影響的相關性。對其他8度區(qū)的建筑結(jié)構(gòu),可通過上述兩個參數(shù)的簡單計算,參考已有研究成果對其抗倒塌性能進行定量評估。
[Abstract]:Reinforced concrete (RC) frame structure accounts for a large proportion of the present structural forms in China, and its ability to resist earthquake collapse is an important index to ensure the safety of people's lives and property. A large number of existing reinforced concrete frame structures in our country have a low design standard, together with durability and damage accumulation factors, which make the bearing capacity of the structure reduced. How to reasonably evaluate the ability of building structures to resist earthquake collapse has become an important frontier issue. It is urgent to develop a set of indicators to quantitatively evaluate the ability of building structures to resist earthquake collapse. So that the structure with insufficient seismic capacity can be strengthened or dismantled as soon as possible to ensure that the structure will not collapse after a large earthquake. Considering that dynamic elastic-plastic time-history analysis is usually required for anti-collapse analysis, it takes a long time and the modeling process is cumbersome, which is impractical for a large number of existing buildings. Therefore, based on the incremental dynamic analysis method, this paper presents a simplified evaluation index of anti-collapse, which can be quantitatively evaluated by simple calculation. The main research work and results are as follows: (1) vulnerability analysis of RC frame structures designed according to the current seismic code of China is carried out, and the collapse performance is quantitatively evaluated under the expected earthquake intensity. The results show that the RC frame structure designed according to the current seismic code in China can meet the earthquake collapse requirements of the structure under the expected rare earthquake, and the probability of collapse is relatively small. The fiber model and plastic hinge model based on PERFORM-3D are analyzed and compared. The results show that the response of the two structures is basically the same, and the difference on the collapse performance of the structures is small. Considering the convenience of modeling and the reliability of evaluation, The influence of "strong column and weak beam" on the collapse resistance of the structure is discussed. This change is considered by adjusting the bending bearing capacity ratio c b?M/?M of the column. The results show that the flexural bearing capacity of columns and beams has a significant effect on the collapse resistance of the structure, and the optimum ratio corresponding to the reference building is determined. (4) the influence of "strong shear and weak bending" on the collapse resistance of the structure is discussed. This change is considered by adjusting the stirrups spacing and changing the configuration parameter p uV/V. The results show that the variation of uV/V has a certain influence on the collapse resistance of the structure. (5) synthesizing the above two parameters, and analyzing the correlation of the influence on the collapse resistance of the structure. Through the simple calculation of the above two parameters and referring to the existing research results, the anti-collapse performance of the other 8 degree building structures can be quantitatively evaluated.
【學位授予單位】：西安建筑科技大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：TU375.4;TU352.11

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