Research On Force Performance Of Precast Hollow Concrete Shear Walls

At present, the Harbin Institute of Technology independently developed the technology of the Restraint grouting-anchoring overlap-joint of the steel bar as the core of precast concrete architecture has been a lot of applications, and built over one million square meters of high-rise structures. Relevant research results have been incorporated into the national and local standards. Given the current precast concrete shear wall structure mainly used in high-rise buildings, the shear shipped from the factory to the site must resort to large-scale transport, lifting equipment. In order to reduce the weight of precast concrete shear walls, and consider more than the application of the middle building structure precast concrete shear wall, the group proposed a new system of precast hollow concrete shear wall structure. This paper mainly for its steel connection, a study of forced behaviors.First of all, we conduct the research of material properties of hollow concrete,researching the force performance of hollow concrete in basic axial pressure effect. Experimental design three different hollow concrete specimens aspect ratio, axial compression tests performed. Through testing to determine the aspect ratio of 1: 1, the test piece is hollow concrete standard parts, and gives the strength of hollow concrete conversion method and constitutive relations.Secondly, in order to solve connectivity problems in precast hollow reinforced concrete shear wall, propose steel return bends overlapped connection technology. In this experiment, the edge member longitudinal bars connected by the Restraint grouting-anchoring overlap-joint of the steel bar, and distribution of steel connections by steel return bends overlapped connection technology. It was found that reinforced bight lap joint is reliable and will not appear reinforced connecting destruction.On the basis of the distribution of steel bent back on the lap joint, designed four precast hollow concrete shear walls quasi static test study, including two mosaic wall, two whole wall. Wherein the mosaic wall reinforced by distribution connection scheme divided into double and single row connectors connection. For four precast hollow concrete walls under cyclic loading in the destruction of the state under the action of hysteretic energy capacity and test capacity and reinforced strain has done a detailed comparative analysis pieces. The results showed that the carrying capacity of precast hollow concrete shear walls and mosaic wall as a whole is very close, mosaic wall ductility and energy dissipation capacity to be slightly better than the overall wall; vertical distribution of the different connection reinforcement program has almost no effect on the Carrying Capacity, single row connectors of the wall favorable ductility and energy dissipation capacity. In this paper, a standardized calculation model given capacity calculation method takes into account the impact of hollow precast concrete hollow concrete shear walls.