Experimental Study On Flexural Behavior Of New Type Reinforced Concrete Shear Wall

Precast concrete shear wall structure is a monolithic structure which is assembled and connected in the construction site. Its' basic assembly unit is a precast or a semi-precast concrete panel. The new-typed structure has many advantages, such as easy construction, rapid construction speed and energy conservation thus become an important form in the industrialized building area.A new type of precast concrete shear wall structure is presented. Its basic assembly unit is a precast two-way hollow slab with vertical and horizontal holes inside. The reinforcement is placed into the horizontal and vertical hollow holes. And then concrete is poured into the holes to form an integral structure. Flexural behavior is researched for the new-typed precast concrete shear wall structure in this paper. The research findings are as follows:(1) Under the influence of constant axial force, quasi-static tests for one traditional reinforces concrete shear wall and two new precast concrete shear walls are carried out and the failure modes of the new precast concrete shear wall specimens are obtained. It shows that the new precast concrete shear wall and the traditional reinforces concrete shear wall share similar failure modes, for example, the concrete is collapsed in the root of the wall; the longitudinal reinforcement around the edges is seriously buckled, and the sound new-old concrete interfaces can effectively ensure the integral performance of the wall.(2) Three new precast concrete shear wall specimens with vertical joints are researched and the experimental results show that vertical joints are reasonable and reliable since they are not damaged during the whole course of the experiment and relative deformations of both sides among the three walls are less than 0.4mm; and horizontal joints can connect upper and lower walls effectively since sliding deformations of walls around horizontal joints account for less than 4% of the total horizontal deformation.(3) The ratio of longitudinal reinforcement around the edges has a great impact on the flexural performance of walls. Through comparative analysis, it can be seen that flexural bending capacity of the new precast concrete shear wall specimens will gradually increase and its initial stiffness will grow significantly, but its deformability will descend as the number of longitudinal reinforcement bars around the edges increased.(4) Numerical simulation is carried out by using finite element software ABAQUS and new-old concrete interfaces within the new precast concrete shear wall is simulated under the guidance of coulomb friction theory in the thesis. The results of numerical analysis agrees well with the experiment results and the error is less than 6.2%. Therefore, the model is reasonable and the calculation result is reliable.