预制空心混凝土剪力墙受力性能研究

发布时间：2019-01-30 11:18

【摘要】：目前,哈尔滨工业大学自主研发的以约束浆锚钢筋连接技术为核心的预制混凝土结构体系已经得到了大量的应用,已建成的高层建筑超百万平米。相应研究成果已编入国家和地方标准。目前预制混凝土剪力墙主要运用在高层建筑结构中,剪力墙从工厂运到工地必须借助于大型的运输、吊装设备。为了减轻预制混凝土剪力墙的自重,并考虑在多、中层建筑结构中应用预制混凝土结构,课题组提出了一种新型的预制空心混凝土剪力墙结构体系。本文主要针对其钢筋连接方式、结构受力性能展开研究。首先,进行空心混凝土的材料性能试验研究。对空心混凝土在最基本的轴向压力作用下的受力性能进行研究,试验设计了3种不同高宽比的空心混凝土试件,进行轴压试验。通过试验确定高宽比为1:1的试件为空心混凝土标准件,并给出了空心混凝土的强度换算方法与本构关系。其次,为解决预制空心混凝土剪力墙结构中钢筋的连接问题,提出了钢筋回弯搭接连接技术。本试验中边缘构件纵筋连接采用约束浆锚搭接连接,而墙体分布钢筋则采用钢筋回弯搭接连接技术。试验发现,钢筋回弯搭接连接是可靠的,不会出现钢筋连接破坏。最后,在分上述试验的基础上,设计制作了4片预制空心混凝土剪力墙进行拟静力试验研究,包括2片拼接墙、2片整体墙。其中拼接墙按分布钢筋连接方案不同分为双排连接和单排连接。对4片预制空心混凝土墙体在低周往复荷载作用下的在破坏状态滞回耗能能力和试件承载力和钢筋应变方面做了详细的对比分析。结果表明,预制空心混凝土剪力墙整体墙和拼接墙的承载能力非常接近,拼接墙的延性和耗能能力要稍好于整体墙;纵向分布钢筋不同连接方案对试件承载力几乎无影响,采用单排连接对墙体延性和耗能能力有利。本文采用规范计算模式给出了考虑空心混凝土影响的预制空心混凝土剪力墙的承载力计算方法。
[Abstract]:At present, the precast concrete structure system, which is developed by Harbin University of Technology and developed independently, is based on the technology of restrained grouting anchor steel bar, and has been widely used, and the high-rise building has been built for more than one million square meters. The corresponding research results have been incorporated into national and local standards. At present, precast concrete shear walls are mainly used in high-rise building structures, and the shear walls must be transported from the factory to the construction site with the aid of large-scale transportation and hoisting equipment. In order to reduce the deadweight of precast concrete shear wall and consider the application of precast concrete structure in middle building structure, a new type of precast concrete hollow concrete shear wall structure system is proposed. In this paper, the connection mode of steel bar and the mechanical behavior of the structure are studied. Firstly, the material properties of hollow concrete are studied. The mechanical behavior of hollow concrete under the most basic axial pressure is studied. Three kinds of hollow concrete specimens with different aspect ratio are designed and tested under axial compression. The test results show that the specimen with a aspect ratio of 1:1 is a standard part of hollow concrete, and the strength conversion method and constitutive relation of hollow concrete are given. Secondly, in order to solve the connection problem of steel bar in precast hollow concrete shear wall structure, the technology of steel bar back bending and lap connection is put forward. In this experiment, the longitudinal reinforcement of the edge member is connected by restrained grouting anchor, while the distributed reinforcement of the wall is connected by the technique of rebar bending and lapping. It is found that the back-bending lap joint of steel bar is reliable and will not be damaged. Finally, on the basis of the above experiments, four prefabricated hollow concrete shear walls are designed and fabricated for quasi-static test, including two spliced walls and two integral walls. The splicing wall is divided into two rows and one row connection according to the distribution reinforcement connection scheme. The hysteretic energy dissipation capacity of four precast hollow concrete walls under low-cycle reciprocating load and the load-carrying capacity of the specimens and the strain of the steel bar are compared and analyzed in detail. The results show that the load-carrying capacity of the precast hollow concrete shear wall is very close to that of the spliced wall, and the ductility and energy dissipation capacity of the spliced wall is slightly better than that of the integral wall. The different connection schemes of longitudinal distribution steel bar have little effect on the bearing capacity of the specimen, and the single row connection is beneficial to the ductility and energy dissipation capacity of the wall. In this paper, the method of calculating the bearing capacity of precast hollow concrete shear wall considering the influence of hollow concrete is presented by using the standard calculation model.
【学位授予单位】：哈尔滨工业大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TU375

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