Optimization Of Keel Spacing And Seismic Performance Of Assembled Integral Thermal Insulation Composite Wall

Assembled integral thermal insulation composite wall system is a new type of residential system with excellent thermal insulation and sound insulation properties.At present,there is little basis for the regulation of the keel spacing of the wall.In the construction,it is often selected according to experience,which is unsafe and not economical.There is also very little research on the seismic performance of the new wall.In this paper,the keel spacing of the assembled integral thermal insulation composite wall system is optimized,and the seismic performance of the composite wall is studied.The main work is as follows:(1)Various factors affecting the distance of the wall light steel keel were analyzed,including the foam concrete side pressure,the flexural strength of the fiber reinforced cement board,the strength of the light steel keel and the "heat bridge" effect In the study of the influence of the side pressure of the foam concrete on the keel spacing,it is found that the empirical formula of the parameter initial setting time is not applicable to the calculation of the initial setting time of the foam concrete.By fitting the experimental data,a reference formula for curing temperature and initial setting time of foamed concrete is obtained,which provides a theoretical basis for the optimization of keel spacing.(2)After analysis,the relationship between keel spacing,panel thickness and casting height is obtained.The distance between keel space is larger and the side pressure of foam concrete between adjacent keel panels becomes larger.When the adjacent keel spacing is smaller than the optimal keel spacing,the bending failure problem is considered first.When the adjacent keel spacing is larger than the optimal keel spacing,the problem of excessive deflection is preferentially considered;within a certain range,the optimal keel spacing increases by 0.02m when the pouring height is increased by 0.1m.In this study,not only the interaction between the influencing factors,but also the optimal keel spacing and the corresponding optimal panel thickness were obtained.(3)Based on the finite element software ABAQUS,a reliable numerical analysis model is established.The numerical analysis results are in good agreement with the existing experimental results.(4)Based on the reliable assembly integral thermal insulation composite wall system model,the low-cycle repeated horizontal load test was carried out to study the influence of light steel keel spacing,foam concrete strength and axial compression ratio on the seismic performance of composite wall.The results show that:within a certain range,reducing the spacing of keel has little effect on the shear capacity and stiffness of composite walls,and has a certain effect on ductility and energy dissipation capacity of composite walls.The smaller the keel spacing,the larger ductility;and increasing the strength of foam concrete can enhance the shear capacity,stiffness,ductility and energy dissipation capacity of composite walls.The shear capacity and stiffness of the composite wall are improved and the ductility and energy dissipation capacity are weakened by increasing the axial compression ratio of the composite wall.