Mechanical Behavior Analysis Of Precast Concrete Shear Wall Structure With No Steel Reinforcement In Horizontal Seam

Industrialization is the aim of residential construction.The precast concrete shear wall is one of the most important structural system for residential industrialization in China.In precast concrete shear wall structures,the details of the connection between precast wall panel and other precast component are complex,which often reuslts in construction error.Therefore,the shear capacity of the seam generally can not satisfy the design requirements in practical engineering.To overcome this problem,we proposed a system called precast concrete shear wall without steel reinforcement in horizontal seam.The mechanical behaviors and failure mode of traditional precast concrete shear wall with steel reinforcement in horizontal seam are studied first.Then refined and macro-based finite element model of the precast concrete shear wall structure with no steel reinforcement in horizontal seam(PCSW-NSRH)are developed and analyzed to study the load bearing capacity and stiffness of the system.The main contents are as following:(1)Refined finite element model is developed by MSC.Marc to analyze the behavior of PCSW-NSRH.And the feasibility of this system is verified in three aspects including:the lateral resistant capacity,the lateral stiffness and the crack development.(2)The mechanical behavior of the precast concrete shear wall without steel reinforcement in horizontal seam and cast-in-place concrete shear wall are compared.Reduction factors of lateral force resistant capacity and lateral stiffness for the PCSW-NSRH are defined.Parametric analyses are carried out to determine the key parameters influencing the reduction factor.A simplified design formula for the reduction factor of the lateral force resistant capacity is proposed.Analysis shows that the lateral stiffness of the precast shear wall can reach 95%of the cast-in-place shear wall and the reduction factor of lateral force resistant capacity varies with the shear span ratio,axial pressure ratio,yield strength and diameter of longitudinal bearing force reinforcement,etc.at 75%-95%.A simplified design formula for the reduction factor of the lateral force resistant capacity is proposed by nonlinear regression analysis.(3)The macro-based finite unit models for the PCSW-NSRH and cast-in-place concrete shear wall structure are developed by ETABS.Two buildings,one with 15 storey and the other with 25 storey are analyzed.Model analysis and nonlinear time history analysis are conducted.The fundamental period,the based shear,the storey displacement and the storey drift are compared between these two system,which proves these two system have similar seismic behavior.