装配式预应力混凝土梁与高强钢筋约束混凝土柱端板螺栓连接节点抗震性能研究

发布时间：2018-02-09 05:01

本文关键词： 装配式节点低周反复加载抗震性能恢复力模型　出处：《西安建筑科技大学》2015年硕士论文　论文类型：学位论文

【摘要】：近年来,在我国大部分地区装配式混凝土结构快速发展,建筑工业化、住宅产业化成为建筑行业的热点话题,建造方式的改革和创新是建筑产业的发展趋势,这将极大提高劳动生产率,节约社会资源。装配式框架结构中,梁-柱节点作为重要的传力纽带,其抗震性能和整体性对于结构的安全使用尤为关键,同时节点现场施工的难易程度也决定了该形式节点的推广应用程度。本文将钢结构中常用的端板螺栓节点引入混凝土结构中,采用高强螺栓将端板与核心区设置钢板箍混凝土柱连接在一起,梁纵向普通钢筋采用新型墩头焊接形式与端板连接,梁预应力钢筋采用螺帽进行锚固,从而形成一种新型的装配节点形式。本文在以往装配式节点的基础上,对新型装配式节点形式的受力和抗震性能进行试验研究。本文共设计6个新型装配式预应力中间节点试件,并制作1个现浇十字形节点试件作为对比,进行低周反复水平荷载加载试验,对节点受力、梁端抗剪承载力和抗弯承载力进行分析,同时重点分析了试件的强度退化、刚度退化、延性和耗能能力,试验结果表明,密配螺旋箍筋有利于提高梁抗剪和抗弯能力,试件的荷载-位移滞回曲线饱满,具有良好的延性和耗能能力,抗震性能良好。本文依据装配式预应力节点低周反复荷载试验结果,建立三线型恢复力模型,并给出了相应阶段的计算公式,同时通过回归分析得到不同阶段加载、卸载刚度随着位移幅值增加的刚度退化公式,并与试验结果进行对比,二者吻合度较高,所提恢复力模型可用于该类装配式结构弹塑性地震反应分析和抗震设计。
[Abstract]:In recent years, with the rapid development of prefabricated concrete structures in most areas of China, the industrialization of buildings and housing has become a hot topic in the construction industry. The reform and innovation of construction methods is the development trend of the construction industry. This will greatly improve labor productivity and save social resources. In prefabricated frame structures, the beam-column connection is an important force transmission link, and its seismic performance and integrity are particularly critical for the safe use of the structure. At the same time, the degree of difficulty in joint construction also determines the degree of popularization and application of this form of joint. In this paper, the common end-plate bolt joints in steel structure are introduced into concrete structure. High strength bolts are used to connect the end plate with the steel plate hoop concrete column in the core area. The longitudinal common steel bar is welded with the end plate by a new type of pier head, and the prestressed steel bar of the beam is anchored by a nut. Therefore, a new type of assembly joint is formed. In this paper, six new prestressing intermediate joint specimens are designed, and a cast-in-place cross joint specimen is made as a comparison. The low cycle repeated horizontal load loading test was carried out to analyze the joint load, the shear capacity of beam end and the flexural bearing capacity. At the same time, the strength degradation, stiffness degradation, ductility and energy dissipation capacity of the specimens were analyzed. The test results show that the strength degradation, stiffness degradation, ductility and energy dissipation capacity of the specimens are analyzed. The dense helical stirrups are helpful to improve the shear and bending resistance of the beams. The load-displacement hysteretic curves of the specimens are full and have good ductility and energy dissipation capacity. The seismic behavior is good. Based on the experimental results of low-cycle cyclic loading of prestressing joints, a three-wire restoring force model is established, and the calculation formulas of the corresponding stages are given. At the same time, through regression analysis, the loading at different stages is obtained. The stiffness degradation formula of unloading stiffness with the increase of displacement amplitude is compared with the experimental results. The proposed restoring force model can be used for the elastoplastic seismic response analysis and seismic design of this kind of prefabricated structures.
【学位授予单位】：西安建筑科技大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TU352.11;TU37

【共引文献】