【摘要】：隨著世界范圍內(nèi)恐怖襲擊活動(dòng)的日益猖獗,建筑結(jié)構(gòu)的連續(xù)倒塌問題逐漸受到工程界的廣泛關(guān)注。結(jié)構(gòu)的連續(xù)倒塌是由于意外荷載(如地震、爆炸、火災(zāi)等)作用下造成結(jié)構(gòu)的局部破壞,并由此引發(fā)連鎖反應(yīng)而導(dǎo)致破壞向結(jié)構(gòu)的其他部位擴(kuò)散,最終使結(jié)構(gòu)主體喪失承載力,造成結(jié)構(gòu)的大面積坍塌。結(jié)構(gòu)連續(xù)倒塌一旦發(fā)生,其引起的后果將是災(zāi)難性的,因此必須充分考慮各種極端荷載作用,提高建筑結(jié)構(gòu)抗連續(xù)倒塌破壞能力,確保人民的生命財(cái)產(chǎn)安全。 本文首先根據(jù)鋼筋混凝土構(gòu)件動(dòng)態(tài)試驗(yàn)結(jié)果,分析得到不同加載速率下鋼筋混凝土梁柱的動(dòng)態(tài)特性,以此建立一個(gè)鋼筋混凝土構(gòu)件三折線恢復(fù)力模型,其考慮屈服強(qiáng)度、極限強(qiáng)度以及剛度的率相關(guān)性,同時(shí)加入損傷因子,考慮混凝土損傷引起的卸載剛度退化；然后根據(jù)鋼筋混凝土梁柱破壞時(shí)的動(dòng)態(tài)特性,建立了考慮應(yīng)變率效應(yīng)的構(gòu)件失效判別準(zhǔn)則。 利用有限元軟件MSC.Marc的二次開發(fā)功能,將建立的鋼筋混凝土恢復(fù)力模型和構(gòu)件失效判別準(zhǔn)則加入到軟件中,然后數(shù)值模擬鋼筋混凝土構(gòu)件動(dòng)態(tài)試驗(yàn)過程,數(shù)值結(jié)果與試驗(yàn)結(jié)果對(duì)比表明,率相關(guān)的恢復(fù)力模型能夠更好地反映鋼筋混凝土梁柱的動(dòng)態(tài)特性,同時(shí)也進(jìn)行了不同加載速率下平面框架結(jié)構(gòu)模型動(dòng)力反應(yīng)分析,研究表明：鋼筋混凝土構(gòu)件的應(yīng)變率效應(yīng)能夠提高結(jié)構(gòu)的側(cè)向剛度。最后對(duì)按照我國(guó)現(xiàn)行規(guī)范設(shè)計(jì)的框架結(jié)構(gòu)進(jìn)行了不同工況的倒塌過程比較分析：1、鋼筋混凝土構(gòu)件恢復(fù)力模型中考慮損傷和不考慮損傷情況下的框架結(jié)構(gòu)連續(xù)倒塌,研究損傷對(duì)結(jié)構(gòu)抗連續(xù)倒塌能力的影響；2、對(duì)鋼筋混凝土框架結(jié)構(gòu)進(jìn)行考慮構(gòu)件應(yīng)變率效應(yīng)和不考慮情況下的彈塑性動(dòng)力時(shí)程分析,以及不同加載速率下的Pushover分析,研究應(yīng)變率效應(yīng)對(duì)結(jié)構(gòu)抗連續(xù)倒塌性能的影響。
[Abstract]:With the increasingly rampant terrorist attacks in the world, the continuous collapse of building structures has been paid more and more attention by the engineering community. The continuous collapse of the structure is due to the local failure of the structure under unexpected loads (such as earthquakes, explosions, fires, etc.), which leads to the diffusion of damage to other parts of the structure, and ultimately to the loss of bearing capacity of the main body of the structure. Resulting in a large collapse of the structure. Once the continuous collapse of the structure occurs, the consequences will be catastrophic, so it is necessary to fully consider all kinds of extreme loads, improve the ability of the building structure to resist continuous collapse damage, and ensure the safety of people's lives and property. In this paper, according to the dynamic test results of reinforced concrete members, the dynamic characteristics of reinforced concrete Liang Zhu under different loading rates are analyzed, and a 70% discount line restoring force model of reinforced concrete members is established, which takes into account the yield strength. At the same time, the damage factor is added to consider the degradation of unloading stiffness caused by concrete damage. Then, according to the dynamic characteristics of reinforced concrete Liang Zhu, a failure criterion considering strain rate effect is established. By using the secondary development function of finite element software MSC.Marc, the established reinforced concrete restoring force model and member failure criterion are added to the software, and then the dynamic test process of reinforced concrete members is numerically simulated. The comparison between the numerical results and the experimental results shows that the rate-dependent restoring force model can better reflect the dynamic characteristics of reinforced concrete Liang Zhu. At the same time, the dynamic response analysis of the plane frame structure model under different loading rates is also carried out. The results show that the strain rate effect of reinforced concrete members can improve the lateral stiffness of the structure. Finally, the collapse process of the frame structure designed according to the current code of our country is compared and analyzed under different working conditions: 1. The continuous collapse of the frame structure considering damage and not considering damage is considered in the restoring force model of reinforced concrete members. The effect of damage on the resistance of structures to continuous collapse was studied. 2. The influence of strain rate effect on the resistance to continuous collapse of reinforced concrete frame structure is studied by considering the strain rate effect of reinforced concrete frame structure and the elastic-plastic dynamic time history analysis without consideration, as well as the Pushover analysis at different loading rates.
【學(xué)位授予單位】：大連理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2013
【分類號(hào)】：TU375.4

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