A Study On Interfacial Bonding Performance Of Each Superposition Interface Of Thermal Insulation Composite Shear Wall

In this paper,a new type of thermal insulation composite shear wall is proposed according to the needs of practical engineering.This new type of wall is composed of prefabricated composite thermal insulation plate and prefabricated basalt fiber reinforced cement plate as two side formworks,and concrete is poured in the middle to form as a whole.As a new type of thermal insulation composite shear wall,it is very important to study the bonding performance of each superposition interface.In this paper,shear tests were carried out on six groups of composite specimens of cement plate and thermal insulation plate under different working conditions,ten groups of composite specimens of thermal insulation plate and concrete under different working conditions,and eight groups of composite specimens of cement plate and concrete under different working conditions.The effects of various factors on the interfacial bonding performance of composite specimens were analyzed from the aspects of failure state,interfacial bonding strength,interfacial shear stress-slippage curve and interfacial bonding energy dissipation capacity.The results show that:(1)Slotting treatment of thermal insulation plate can improve the bonding strength,plastic deformation performance and energy dissipation performance of the interface between cement plate and thermal insulation plate.Under the same slotting direction,increasing the slotting depth or the quantity of slot can improve the interface bonding performance between cement plate and thermal insulation plate,and the effect of "#" type slotting is the most significant.(2)Increasing the strength of concrete,setting bolts at the interface between thermal insulation plate and concrete or slotting the thermal insulation plate can improve the bonding strength between thermal insulation plate and concrete.However,the effect of slotting treatment is the most remarkable.With the increase of slotting depth and slotting quantity,composite specimens perform better interfacial bonding strength,plastic deformation performance and interfacial bonding energy dissipation ability,shows better interfacial bonding performance.(3)In the composite specimens of cement plate and concrete,with the increase of concrete strength,the interfacial bonding strength of composite specimens increases,shows better plastic deformation performance and interfacial bonding energy dissipation capacity.The interfacial shear stress-slippage curve of the composite specimens with ribs is basically linear,and brittle failure occurs in the specimens.Under the same rib size,the interface bonding strength of composite specimens with horizontal ribs is greater than that of composite specimens with vertical ribs.When the direction of ribs is the same,increasing the height and quantity of ribs can improve the bonding strength between cement plate and concrete.On the basis of the experiment,through the regression analysis of the relevant data,the calculation formulas of the interfacial bonding strength between the cement plate and the thermal insulation plate,the interface bonding strength between the thermal insulation plate and the concrete,and the interfacial bonding strength between the cement plate and the concrete are established.The calculated values are in good agreement with the experimental values.The research results of this paper provide a reference for the further study of this new type of thermal insulation composite shear wall.It is also of great significance for the application and promotion of this new type of thermal insulation composite shear wall.