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钢筋混凝土结构抗连续倒塌研究
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三层RC框架的抗连续倒塌设计 摘 要:结构的连续倒塌已成为严重威胁公共安全的重要问题。国外自1968年英国Ronan
Point公寓倒塌事件发生以来,已经对连续倒塌问题进行了三十余年的研究,并编制了相关设计规范,而我国规范目前尚未规定详细抗连续倒塌设计方法。本文参考美国国防部编制的《结构抗连续倒塌设计》(DoD
2005)提供的设计流程,对按照我国现行混凝土结构设计规范设计的三层钢筋混凝土框架进行了连续倒塌仿真,分析了其抗连续倒塌能力。并应用拉结强度法和拆除构件法,对该框架进行了抗连续倒塌设计,建立了将国外规范中的抗连续倒塌设计方法应用于我国框架结构的设计实例,指出了其中存在的一些问题。
结构的连续倒塌:规范介绍与比较 摘要: 目前,结构的连续倒塌已成为严重威胁公共安全的重要问题,因而日益受到关注。国外自1968年英国Ronan
Point公寓倒塌事件发生以来,已经对连续倒塌问题进行了三十余年的研究,并编制了相关设计规范。而我国规范目前尚未规定详细抗连续倒塌设计方法。因此,本文对国外主要的抗连续倒塌设计规范(如美国ACI
318,GSA 2003,DoD 2005、欧洲EuroCode 1、英国BS8100等)中相应的抗连续倒塌设计条文进行了总结和比较,并在此基础上提出了一些结构抗连续倒塌的设计概念和几种主要的设计方法,以及我国在这方面需要解决的问题,可供我国编制相关规范参考。 Simulation
for the collapse of RC frame tall buildings under earthquake disaster,
Abstract: China is a country that suffers a lot from the earthquake disaster. The major reason for the human death and property losses in earthquake is the collapse of the tall buildings. Hence, correct simulation for the failure modes and accurate prediction for the collapse of the tall buildings under earthquake disaster is very useful for studying the safety of buildings and evaluating losses during earthquakes. However, a lot of simplifications must be carried out in the existing simulations to overcome the numerical problems because the grave nonlinearity exists when collapse happens. This may lead to the results away from a real phenomenon. In this study, a fiber model for reinforced concrete (RC) structures (referred as THUFIBER) is developed, which is based on the general-purpose finite element package of MSC.MARC that carries significant capacity of solving nonlinear problems. In this model, the concrete and the reinforcement inside the structural elements are modeled respectively with different fibers so that the cyclic behavior of material can be properly simulated. Pushover and dynamic time-history analysis for a RC frame tall building are carried out to illustrate the capacity of the proposed model. And dynamic time-history analysis is emphasized in this paper to discuss the collapse modes of the structure. The results show that THUFIBER can simulate the collapse and failure process of the structure under the dynamic loads such as complicated seismic loads, including the softening and fracture behaviors of structural elements, and further the program shows good convergence in the non-linear cases. So THUFIBER has a strong and promising ability for nonlinear analysis including collapse numerical simulation. Keywords: fiber model, concrete, seismic, collapse, finite element, frame 基于纤维模型的钢筋混凝土框架结构爆破倒塌破坏模拟 摘 要:结构在爆炸荷载下的倒塌破坏模拟日益受到关注。本文采用基于MSC.MARC有限元软件开发的钢筋混凝土纤维模型程序THUFIBER,对一钢筋混凝土框架结构在爆炸荷载下的倒塌破坏进行了模拟,并根据我国规范特点考虑了框架的正截面和斜截面破坏。计算结果表明,THUFIBER程序可以较好的模拟钢筋混凝土框架结构的倒塌破坏,并对一些关键模型参数进行了讨论。 关键词:爆炸,倒塌,纤维模型,钢筋混凝土,有限元 倒塌分析中框架及土体模型研究 摘 要: 本文以有限元软件MSC.MARC为平台,利用其方便的二次开发功能,开发了钢筋混凝土框架结构和土体的计算模型。框架梁柱采用钢筋混凝土杆系结构的纤维模型THUFIBER模拟,地基土则采用一种改进的Drucker-Prager模型来模拟。计算结果表明,基于MSC.MARC出色的非线性分析能力和二次开发能力,可以很好的进行结构倒塌过程中上部结构和土体关系的模拟。 关键词: MSC.Marc,钢筋混凝土框架,纤维模型,土体模型
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