Study On Seismic Performance Of Assembly Integral Double-wall Precast Concrete Shear Walls With Horizontal Joints

With the development of the social economy,the traditional construction industry relying on cast-in-place concrete construction is facing more and more challenges.The unfavorable factors such as large labor demand and severe environmental pollution have prompted the reform of the construction industry.Building industrialization is a major trend in the development of China's construction industry.China's high-rise residential buildings generally adopt a shear wall structure.Double-wall precast concrete shear walls have many advantages such as higher industrialization,faster construction speed,and less environmental pollution.However,double-wall precast concrete shear wall is mostly used abroad.It is used in the construction of multi-story buildings,and basically does not consider the earthquake-resistant problem.In order to popularize the new type of structural system with double-wall precast concrete shear wall in our country,studying its seismic performance is a very important content.In this paper,in order to study the seismic performance of double-wall precast concrete shear wall,a low-cycle repeated load test was carried out on a cast-in-place shear wall specimen and a double-wall precast concrete shear wall specimen.Compared with the in-situ shear wall,the hysteretic properties,such as hysteretic curve,skeleton curve,bearing capacity and ductility,stiffness degradation,energy dissipation capacity,and interlayer displacement angle,of the double-wall precast concrete shear wall were analyzed.Based on the experimental study,finite element numerical simulation of two shear walls was performed using ABAQUS finite element software.The results of the simulation were compared with the experimental results.The main conclusions are as follows:(1)Double-wall precast concrete shear wall specimens and the cast-in-situ shear wall specimens all have bending shear failure.Compared with the full section crushing of the cast-in-situ shear wall corner,the later pouring concrete in the double-wall precast concrete shear wall corner is crushed first,and the two sides prefabricated concrete are crushed later.(2)The maximum bearing capacity of the double-wall precast concrete shear wall specimen is about 75% of the cast-in-situ shear wall specimens,the ductility coefficient of the double-wall precast concrete shear wall is 5.20,the ductility coefficient of the cast shear walls is 4.66,and the deformation ability after the double-wall precast concrete shear wall yield better than the cast in situ shear wall.(3)Before the concrete is cracked,the stiffness of the double-wall precast concrete shear wall is larger than that of the cast in situ shear wall.After the cracking of the concrete,the stiffness degradation of the double-wall precast concrete shear wall is faster than that of cast-in-situ shear wall.(4)The energy dissipation capacity of the double-wall precast concrete shear wall is better than the cast in situ shear wall in the same displacement,but the energy consumption of the double-wall precast concrete shear wall is relatively less than the cast in situ shear wall.(5)The interlayer displacement angle of double-wall precast concrete shear wall is larger than that of cast-in-situ shear wall at the cracking load,and the interlayer displacement angle is smaller than the cast in situ shear wall at the yield load,peak load and failure load.(6)The skeleton curve obtained by the finite element simulation of double-wall precast concrete shear wall is in good agreement with the experimental skeleton curve.It can be used to simulate the experimental phenomenon the later pouring concrete in the double-wall precast concrete shear wall corner is crushed first,and the two sides prefabricated concrete are crushed later.The finite element model has certain reliability,and it can be used to simulate the seismic capacity of the double-wall precast concrete shear wall under low cyclic reversed loading.(7)Increasing the lap length and diameter of vertical connection reinforcement can improve the bearing capacity of double-wall precast concrete shear wall to a certain extent.When carrying out the design of double-wall precast concrete shear wall,the connection of vertical reinforcement can be properly enhanced.