Study On Seismic Performance Of Prefabricated Assembled Light-steel Composite Wall

Green-assembled eco-houses use heat island principles and fresh air systems to make natural resources such as geothermal and solar energy for indoor temperature and air conditioning,in the case of not consuming any chemical energy to achieve the purpose of winter warm summer cool,with energy-saving,insulation advantages,in line with the MOHURD vigorously promoted the green Low-carbon way and the development of assembly-style building requirements.The main lateral force component of the green-assembled eco-houses is prefabricated and assembled light-steel composite wall.At present,the research on sandwich concrete wall and light-steel composite wall has been carried out by scholars at home and abroad.In order to popularize the application of the greenassembled eco-houses,to improve the earthquake-resistance and energy-saving performance of the rural residence,and to respond to the MOHURD requirements of the green Low-carbon building and the assembled building,it is necessary to study the seismic behavior of the prefabricated light-steel composite wall.In this paper,prefabricated light-steel composite wall is the research object,the seismic behavior of prefabricated light-steel composite wall was studied by using the method of experiment,numerical simulation and theoretical analysis,and the evaluation method of the wall was put forward by the base shear method and the consistency of the main tensile stress.The main work and results are as follows:(1)The pseudo static test of 3 pieces of light-steel composite wall is completed,1 of them is original wall,1 piece is optimized wall,1 piece is a wall with window.The experimental results show that the optimized wall still satisfies the standard limit value under the precondition of reducing the weight and saving the material which achieves the optimization goal;all the hysteretic curves of the wall have a certain pinch effect,and the specimen has a flexural-shear failure mode.(2)By using the universal finite element software Abaqus,the finite element simulation analysis of the mechanical behavior and seismic performance of prefabricated light-steel composite wall is realized,and the correctness of the finite element modeling method and the accuracy of the analysis result are validated.On this basis,the parameters influence analysis of the concrete strength,axial compression ratio,reinforcement configuration and whether there are inclined bracing are carried out.It is found that the bearing capacity of the wall increases gradually with the incease of axial compression ratio,concrete strength and horizontal distribution of steel bars,the strength and ductility of the inclined bracing wall are better than that of the without inclined wall.(3)By using the base shear method and the consistency of the main tensile stress,the equivalent horizontal force in the quasi static test is determined,so that the wall under the effect of the equivalent horizontal force is the same as the force state under the actual earthquake.The evaluation of elastic wall under the action of multiple earthquakes and the effect of elastoplastic wall on rare earthquakes is completed.Under the action of multiple earthquakes,the wall is not cracked;Under the action of rare earthquakes,the wall without torsion in elastoplastic state can meet the requirement of bearing capacity.