Research On Fire Resistance Of Double Steel Plate Shear Wall

In recent years,the rapid development of China's economy has led to an increase in the number of high-rise buildings.Shear walls with good seismic performance and barrels made of shear walls have been widely used in high-rise buildings in China.The open-hole outsourcing double steel plate-concrete composite shear wall is a new kind of shear wall,with the advantages of thin wall,light weight,good ductility,simple structure,quick construction and so on.People have conducted a lot of research on their mechanical properties at room temperature.However,there are few reports on the mechanical properties under high temperature and after high temperature.In this paper,FEM software ABAQUS was used to study the fire resistance and mechanical properties of open-hole double-steel plate shear walls.The temperature field and mechanical properties after fire were numerically simulated.The double-steel plate was studied on both open and closed states.Shear wall performance effects.Mainly studied the following aspects:(1)In order to simulate the fire resistance of double-steel shear walls with open holes,the thermal parameters of the steel plate and concrete: derivative coefficient,specific heat capacity,density,and thermal expansion coefficient were introduced.The calculation formulas of different countries were given and analyzed.Select the appropriate calculation formula.The mechanical properties of steel and concrete at high temperatures are given:elastic modulus,Poisson's ratio,stress-strain relationship,yield strength of steel,and the change law of compressive strength of concrete.The appropriate calculation formula is selected through analysis.(2)The ABAQUS finite element software was used to establish a model of open-hole double-plate shear wall.The initial conditions and boundary conditions were set.The ISO-834 standard heating profile was used to load.Considering single-sided and double-sided exposure to fire,given the time Variation of temperature field of double steel plate shear wall.The increase in temperature of the shear wall on the fire surface is faster and slower,similar to the temperature rise curve;the temperature on the back wall surface of the shear wall heats up slowly,and the overall temperature is lower.A comparative analysis of the temperature field of the single and double fire conditions found that the center temperature of the shear wall increased by the double sided fire.(3)Given the axial compression ratio,under the condition of fire(high temperature),the law of displacement and deflection of the double-steel shear wall with open fire increaseswith time,and as the time of fire increases,the temperature of the fire surface increases.The higher the shear strength,the lower the steel and concrete strength of the shear wall,the direction of deflection from the fire surface to the back surface,the negative deflection,and gradually increased;in the late period of the fire,deflection and deformation speed increased,To reach the fire limit,the deflection of the shear wall has abruptly increased and rapidly increased...