钢筋混凝土框架结构连续倒塌破坏机理研究
发布时间：2019-05-19 13:53
【摘要】：随着世界范围内恐怖袭击活动的日益猖獗,建筑结构的连续倒塌问题逐渐受到工程界的广泛关注。结构的连续倒塌是由于意外荷载(如地震、爆炸、火灾等)作用下造成结构的局部破坏,并由此引发连锁反应而导致破坏向结构的其他部位扩散,最终使结构主体丧失承载力,造成结构的大面积坍塌。结构连续倒塌一旦发生,其引起的后果将是灾难性的,因此必须充分考虑各种极端荷载作用,提高建筑结构抗连续倒塌破坏能力,确保人民的生命财产安全。 本文首先根据钢筋混凝土构件动态试验结果,分析得到不同加载速率下钢筋混凝土梁柱的动态特性,以此建立一个钢筋混凝土构件三折线恢复力模型,其考虑屈服强度、极限强度以及刚度的率相关性,同时加入损伤因子,考虑混凝土损伤引起的卸载刚度退化；然后根据钢筋混凝土梁柱破坏时的动态特性,建立了考虑应变率效应的构件失效判别准则。 利用有限元软件MSC.Marc的二次开发功能,将建立的钢筋混凝土恢复力模型和构件失效判别准则加入到软件中,然后数值模拟钢筋混凝土构件动态试验过程,数值结果与试验结果对比表明,率相关的恢复力模型能够更好地反映钢筋混凝土梁柱的动态特性,同时也进行了不同加载速率下平面框架结构模型动力反应分析,研究表明：钢筋混凝土构件的应变率效应能够提高结构的侧向刚度。最后对按照我国现行规范设计的框架结构进行了不同工况的倒塌过程比较分析：1、钢筋混凝土构件恢复力模型中考虑损伤和不考虑损伤情况下的框架结构连续倒塌,研究损伤对结构抗连续倒塌能力的影响；2、对钢筋混凝土框架结构进行考虑构件应变率效应和不考虑情况下的弹塑性动力时程分析,以及不同加载速率下的Pushover分析,研究应变率效应对结构抗连续倒塌性能的影响。
[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.
【学位授予单位】：大连理工大学
【学位级别】：硕士
【学位授予年份】：2013
【分类号】：TU375.4
本文编号：2480778
[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.
【学位授予单位】：大连理工大学
【学位级别】：硕士
【学位授予年份】：2013
【分类号】：TU375.4
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