新型装配式钢筋混凝土结构梁柱结合点抗震性数值分析

发布时间：2018-11-26 20:08

【摘要】：随着城市化和新农村建设的推进,人口老龄化的加剧,我国对建筑行业转型建筑工业化的要求迫在眉睫。预制装配式建筑抗震性能的不确定性是其在发展中的瓶颈,且构件连接节点是预制装配结构体系抗震的薄弱环节,因此,开发出即能满足装配式抗震要求,又能实现标准化的连接形式,是发展预制装配式建造方式的关键环节之一。本文针对以往传统结点存在的不足,提出预制装配式钢筋混凝土结构新型梁—梁结合点。该结合点的特色在于装配梁结合点位于跨中截面,梁两端对称分布,可减少预制梁构件的长度,更方便安装及成批预制生产。因装配节点位于梁跨中截面,梁底部拉应力最大,且钢筋主要承受拉力,所以钢筋的连接是该结合点的主要控制因素,总结各种钢筋连接技术的优缺点,从安全及经济的角度出发,确定选用半套筒灌浆连接。为研究半套筒灌浆连接柱的承载能力和抗震性能,首先利用ABAQUS有限元软件建立精细化钢筋半套筒灌浆连接柱模型,在低周反复荷载作用下,对比模型的破坏形态、滞回曲线、骨架曲线等参数,验证模型的正确性。并在此基础上以轴压比为变量进行模拟试验,得出随着轴压比的增加,柱骨架钢筋应力及承载力加大,但构件延性和耗能性能降低;并提出该种装配式节点最大轴压比应略低于《建筑抗震设计规范》规定的限值。根据《R-PC的设计》和《预制装配整体式钢筋混凝土结构技术规范》,以一级抗震设防等级为背景,设计一 RC框架梁,建立结合点位置不同及钢筋连接形式不同的模型,得出本文梁竖向结合部设计满足抗震要求,对梁-梁结合点进行参数分析,探讨了包括后浇区配箍率、钢筋强度、混凝土强度等参数对结合点在循环荷载作用下承载力及滞回性能的影响,根据分析结果对结合点的抗震设计提出建议。
[Abstract]:With the development of urbanization and the construction of new countryside and the aggravation of aging population, it is urgent for our country to transform the construction industry. The uncertainty of seismic performance of prefabricated building is the bottleneck in its development, and the connection joint is the weak link of earthquake resistance of precast assembly structure system. Therefore, the development of prefabricated building can meet the requirements of prefabricated aseismic design. It is one of the key links to develop prefabricated construction mode to realize standardized connection form. In view of the shortcomings of the traditional joints in the past, a new type of beam-beam joint of prefabricated reinforced concrete structures is proposed in this paper. The characteristic of the joint point is that the assembly beam joint point is located in the middle section of the span, and the two ends of the beam are symmetrically distributed, which can reduce the length of the precast beam members and facilitate installation and batch production. Because the assembly joint is located in the middle section of the beam span, the tensile stress at the bottom of the beam is the largest, and the steel bar is mainly subjected to tensile force, so the connection of the steel bar is the main controlling factor of the joint point, and the advantages and disadvantages of various kinds of steel bar connection technology are summarized. From the point of view of safety and economy, the selection of semi-sleeve grouting connection is determined. In order to study the bearing capacity and seismic behavior of semi-sleeve grouting connecting column, the model of reinforced semi-sleeve grouting connection column is established by using ABAQUS finite element software. Under low-cycle repeated load, the failure pattern and hysteretic curve of the model are compared. Skeleton curve and other parameters to verify the correctness of the model. On this basis, the axial compression ratio is taken as the variable to carry out the simulation test. It is concluded that with the increase of the axial compression ratio, the stress and bearing capacity of the column skeleton steel increase, but the ductility and energy dissipation performance of the members decrease. It is also proposed that the maximum axial compression ratio of the assembled joints should be slightly lower than the limit specified in the Code for Seismic Design of buildings. According to "Design of R-PC" and "Technical Specification for prefabricated Assembly integral reinforced concrete structures", a RC frame beam is designed against the background of the first grade seismic fortification grade, and a model with different joint points and different forms of reinforcement connection is established. It is concluded that the vertical joint design of the beam meets the seismic requirements, and the parameters of the beam-beam joint point are analyzed, including the hoop ratio in the post-pouring area and the strength of the steel bar. The influence of concrete strength and other parameters on the bearing capacity and hysteretic behavior of the joint points under cyclic load is discussed. Based on the analysis results, some suggestions are put forward for the seismic design of the joint points.
【学位授予单位】：西安理工大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TU375;TU352.11

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