| In order to speed up the construction of an energy-saving society,in the current shortage of resources,the reuse of existing resources has quietly become the focus of social attention.Polystyrene extracted from petroleum is one of the white pollutants.At this stage,the new material company uses the expandable polystyrene beads to heat,foam,and then pour into the mold to shape,with the building modulus,four sides have A new type of template made up of rectangular plug-in tongues and evenly distributed dovetail grooves on the inner and outer surfaces is gradually being applied to the construction industry.The HR-EPS shear wall is a new type of energy-saving wall made of EPS(polystyrene insulation board)cavity structure module,which is made by staggering and splicing the steel bars,and then poured into concrete;the wall can be removed.The template has the advantages of thermal insulation,light weight and high strength.At present,there are few theoretical basis for the EPS module shear wall.In particular,the research on seismic resistance of the modular shear wall without scale is lacking.For better promotion and utilization,theoretical research is imperative.The axial compression ratio is one of the factors affecting the seismic performance of the module shear wall.The low cycle repeated load test mainly explores the non-scaled modular shear wall on the seismic performance under different axial compression ratios,and uses the finite element.The software ABAQUS simulates the stress performance of the EPS module shear wall with different axial compression ratios.The main research work and conclusions are as follows:(1)Design and manufacture a non-scaled EPS module shear wall with axial compression ratios of 0.2 and 0.3 respectively.The total height of the wall is 3300 mm,and the wall size is 2400×1940×130(mm),abbreviated as MSW-1.MSW-2.The concrete strength grade of the shear wall is C30,and the HRB400 grade steel bar is arranged in the module limit groove with a diameter of 8mm.Through the low-cycle repeated quasi-static test,the cracking,yielding and ultimate load of the shear wall are recorded,and the development trend of the load crack at each level is drawn.The hysteresis curve,skeleton curve,stiffness degradation curve,calculation,etc.are drawn by using the obtained data.Viscosity damping coefficient and displacement ductility.Comparing the seismic performance of the shear wall with different axial compression ratios,the results show that the axial compression ratio increases,the hysteresis curve becomes more full and round,the energy consumption is better,the ultimate bearing capacity is improved,but the amplitude is not large,and the ductility is slightly decreased.Overall,the modular shear wall has good seismic performance.(2)The axial compression ratio is increased within a certain range,which can effectively suppress the generation and development of cracks,so that the bearing capacity is enhanced;the higher axial compression ratio suppresses the development of cracks and also increases the height of the concrete compression zone,while the plastic zone development of the steel is not inhibited,and the deformation of the steel on the tension side cannot be fully yielded or the deformation after yielding is not developed.(3)The finite element software ABAQUS is used to simulate the seismic performance of the four-sided EPS module shear wall with the axial compression ratio from 0.1 to 0.4.The conclusion shows that with the increase of the axial compression ratio,the horizontal bearing capacity of the specimen shows a first increase and then decrease.The variation law and the ductility decreased slightly.The hysteresis curve,skeleton curve and displacement ductility of the shear wall with axial compression ratio of 0.2 and 0.3 were in good agreement with the experimental results.The simulation and test results reflected the same regularity.Finally,through the approximate calculation method of shear wall,the shear wall of EPS module is determined to be a small opening shear wall,and the calculation formula of the lateral stiffness of the module shear wall is based on the calculation formula of the lateral stiffness of the common shear wall.Divided by a factor of 1.7. |
