| As a new type of lateral force-resisting member,double steel plate concrete combination shear wall is mainly composed of steel plate and concrete,the synergy of the two materials can give full play to the steel tensile properties and concrete compressive properties,double steel plate concrete combination shear wall has higher bearing capacity and seismic performance than the traditional reinforced concrete shear wall,with better ductility and horizontal shear resistance.The use of double-plate concrete composite shear walls in the structure can effectively improve the seismic performance of the structure and increase the usable space of the structure.In this paper,the mechanical properties of double steel plate concrete composite shear walls under different temperature environments are investigated,and the main work and conclusions are as follows:Simulation of double steel plate concrete combined shear wall specimens under different temperature environments for mechanical property analysis,the simulation results are compared with the existing test results,and the error between them is small,which shows the feasibility of simulation by finite element software.Five sets of double-plate concrete composite shear walls under different temperature environments were established by the finite element software,and the results were compared to analyze the change of seismic performance of the composite shear walls.The results showed that the load-bearing capacity of the double-plate concrete composite shear walls increased with the decrease of temperature,but the deformation capacity,ductility coefficient and seismic performance decreased.Parametric analysis was carried out for the mechanical properties of the double steel plate concrete combined shear wall under different temperature environments,and the change of seismic performance under representative temperature environments was investigated by changing the parameters of steel plate thickness,axial compression ratio and wall thickness of the combined shear wall.The results show that the hysteresis curve,skeleton curve,bearing capacity,ductility,stiffness degradation and energy dissipation capacity of the combined concrete shear walls with different steel plate thickness,axial compression ratio and wall thickness exhibit basically similar trends under the same temperature environment.Under three sets of temperature environments,when the axial compression ratio is 0.5,the double-plate concrete composite shear wall has better bearing capacity and energy dissipation capacity while maintaining relatively safe ductility;at high temperature,170 mm wall thickness performs the best,and at room temperature and low temperature,150 mm wall thickness performs the best.On the basis of the existing research above,setting the temperature of the inner side of the double-plate concrete combined shear wall at 20°C and the outer side at 0°C,-20°C and-40°C,respectively;as well as adding 70 mm of expanded polystyrene board insulation on the low-temperature side of three groups of specimens,the horizontal low circumferential reciprocal loading simulation was carried out on six groups of specimens,and the six groups of specimens could further study the combined shear wall at different temperature differences and with or without The six groups of specimens can further study the load-bearing capacity,ductility,energy dissipation capacity and other characteristics of the combined shear wall at different temperature difference and with or without insulation.It is found that the larger the temperature difference,the stronger the bearing capacity of the specimen,the lower the ductility,and the lower the energy dissipation capacity;the increase of insulation layer makes the overall temperature of the specimen increase and thus the energy dissipation capacity of the specimen increases. |
