粘钢加固既有RC框架结构抗连续倒塌性能的研究
发布时间：2018-12-08 09:58
【摘要】：大量的既有建筑物没有经过抗连续性倒塌的设计,存在发生连续性倒塌的风险,如果由于各种因素综合作用而导致建筑物发生了连续性倒塌事故,就必然会造成重大的人员伤亡及经济财产损失。因此,研究建筑物防连续倒塌的力学响应,采用合理的加固方案提高既有建筑物的整体性与安全性已成为急需解决的问题。粘钢加固法以其高强高效、经济简单等优点,适用于提高钢筋混凝土框架结构抗连续性倒塌能力。采用ANSYS有限元软件建立了6层钢筋混凝土框架结构数值分析模型,通过对不同失效工况下数值模型的线性静力及非线性静力风险评估,得出了在角柱失效工况下,框架结构会发生连续性倒塌。为了进一步分析不同失效工况下的评估结果,建立了四种梁柱子结构有限元模型,并进行了非线性静力分析,通过研究其抗力-位移曲线、抗力-时间曲线、裂缝发展情况、塑性铰、混凝土及钢筋的强度变化等参数,得出了不同梁柱子结构的抗力机制。基于结构的风险评估结果及抗力机制,针对角柱失效工况,提出了三种不同的粘钢加固方案,分别建立了加固后的钢筋混凝土梁柱子结构有限元模型,并进行了非线性静力计算。通过比较承载能力、延性及裂缝等指标,得出了加固后梁柱子结构的抗力机制。选取两种较优的粘钢加固方案,建立了加固后的钢筋混凝土框架结构整体模型,通过对数值模型的非线性静力风险评估,表明加固后的框架结构不会发生连续性倒塌破坏,进一步证实了加固方案的有效性。基于本文的有限元分析,提出了一些针对于建筑物抗连续性倒塌的加固建议。
[Abstract]:A large number of existing buildings have not been designed to resist continuous collapse, and there is a risk of continuous collapse. It will inevitably cause heavy casualties and economic and property losses. Therefore, it has become an urgent problem to study the mechanical response of buildings against continuous collapse and to improve the integrity and safety of existing buildings by means of reasonable reinforcement schemes. Due to its advantages of high strength and high efficiency, simple economy and so on, the bonded steel reinforcement method is suitable for improving the continuous collapse resistance of reinforced concrete frame structures. The numerical analysis model of six story reinforced concrete frame structure is established by using ANSYS finite element software. Through the linear static and nonlinear static risk assessment of the numerical model under different failure conditions, the failure condition of corner column is obtained. The frame structure will collapse continuously. In order to further analyze the evaluation results under different failure conditions, four kinds of finite element models of Liang Zhu substructure were established, and the nonlinear static analysis was carried out. The resistance displacement curve, resistance time curve and crack development were studied. The resistance mechanism of different beam-column structures is obtained by the parameters of plastic hinge, strength change of concrete and steel bar. Based on the risk assessment results and resistance mechanism of the structure, three different reinforced concrete beam and column structure finite element models are proposed in view of the failure condition of the corner column. The nonlinear static calculation is carried out. By comparing the bearing capacity, ductility and crack, the resistance mechanism of strengthening post-beam structure is obtained. Two kinds of steel bonded reinforcement schemes are selected and the whole reinforced concrete frame structure model is established. Through the nonlinear static risk assessment of the numerical model, it is shown that the strengthened frame structure will not collapse continuously. The effectiveness of the reinforcement scheme is further verified. Based on the finite element analysis in this paper, some reinforcement suggestions for continuous collapse of buildings are put forward.
【学位授予单位】：河北建筑工程学院
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TU375.4;TU312.3
[Abstract]:A large number of existing buildings have not been designed to resist continuous collapse, and there is a risk of continuous collapse. It will inevitably cause heavy casualties and economic and property losses. Therefore, it has become an urgent problem to study the mechanical response of buildings against continuous collapse and to improve the integrity and safety of existing buildings by means of reasonable reinforcement schemes. Due to its advantages of high strength and high efficiency, simple economy and so on, the bonded steel reinforcement method is suitable for improving the continuous collapse resistance of reinforced concrete frame structures. The numerical analysis model of six story reinforced concrete frame structure is established by using ANSYS finite element software. Through the linear static and nonlinear static risk assessment of the numerical model under different failure conditions, the failure condition of corner column is obtained. The frame structure will collapse continuously. In order to further analyze the evaluation results under different failure conditions, four kinds of finite element models of Liang Zhu substructure were established, and the nonlinear static analysis was carried out. The resistance displacement curve, resistance time curve and crack development were studied. The resistance mechanism of different beam-column structures is obtained by the parameters of plastic hinge, strength change of concrete and steel bar. Based on the risk assessment results and resistance mechanism of the structure, three different reinforced concrete beam and column structure finite element models are proposed in view of the failure condition of the corner column. The nonlinear static calculation is carried out. By comparing the bearing capacity, ductility and crack, the resistance mechanism of strengthening post-beam structure is obtained. Two kinds of steel bonded reinforcement schemes are selected and the whole reinforced concrete frame structure model is established. Through the nonlinear static risk assessment of the numerical model, it is shown that the strengthened frame structure will not collapse continuously. The effectiveness of the reinforcement scheme is further verified. Based on the finite element analysis in this paper, some reinforcement suggestions for continuous collapse of buildings are put forward.
【学位授予单位】：河北建筑工程学院
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TU375.4;TU312.3
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