Experimental Study On Seismic Performance Of Coal Gangue Concrete Shear Wall Under Horizontal Reciprocating Load

With the continuous development of the world economy,the process of urbanization is gradually accelerated,the output of solid waste,especially municipal solid waste,is increasing,and the pollution to the environment is becoming increasingly serious.Therefore,it is becoming the focus of public attention to open up a green,environmental protection and sustainable construction development road.With the deepening of the construction system reform and the continuous expansion of the construction scale,the construction industry develops rapidly,but the improvement of labor productivity is not significant,there are many quality problems,and the construction industrialization has become the development direction of China’s construction industry.As a kind of solid waste produced in the process of coal production,coal gangue has caused serious pollution to the surrounding environment.If the coal gangue can be applied to the construction industry,and its industrial production,on the one hand,the solid waste resource utilization is realized,in line with the green and environmental protection building development concept,on the other hand,it also realizes the development direction of construction industrialization.In this paper,the failure mechanism and seismic performance of coal gangue concrete shear wall are studied by horizontal reciprocating load test and finite element software ABAQUS simulation:(1)The horizontal reciprocating load is applied to the coal gangue concrete shear walls with0,50% and 100% replacement rate of coal gangue.The load displacement hysteretic curve and skeleton curve are obtained.The test data are analyzed and the failure mechanism and seismic performance of each shear wall are compared,including ductility,bearing capacity,stiffness degradation,strength degradation and energy dissipation capacity.The results show that the mechanical properties and failure modes of coal gangue concrete shear wall and ordinary concrete shear wall are similar,and the characteristics of hysteretic curve and skeleton curve are roughly the same.With the increase of coal gangue replacement rate,the bearing capacity of the three shear walls gradually decreases,the ductility is worse and worse,the strength degradation is gradually obvious,and the energy consumption capacity is poor,but the difference is not obvious,all of them can meet the requirements of seismic performance.In addition,with the increase of coal gangue replacement rate,the stiffness degradation is more slow,so it is feasible to make shear wall by using coal gangue concrete instead of ordinary concrete.(2)The plastic damage model of concrete in ABAQUS is used to establish the finite element model of coal gangue concrete shear wall with 100% replacement rate of coal gangue in the test.The finite element model is used to verify the above test,and the load displacement hysteretic curve and skeleton curve obtained are analyzed,the equivalent plastic strain nephogram,compressive damage nephogram,tensile damage nephogram and stress nephogram of reinforced concrete obtained by simulation were observed and compared with the experimental results.The results show that the model can well reflect the failure mode and crack development of coal gangue concrete shear wall in the whole loading process,which proves that the finite element model is reasonable.(3)Through the establishment of finite element model,the parameters of coal gangue concrete shear wall with 100% replacement rate of coal gangue are analyzed.The parameters mainly include axial compression ratio,height width ratio and strength grade.The influence of different parameters on seismic performance of coal gangue concrete shear wall is studied through the skeleton curve obtained by finite element simulation.The results show that the increase of axial compression ratio can improve the initial stiffness and horizontal ultimate bearing capacity of the wall,but the ductility becomes worse and worse;the increase of height width ratio reduces the initial stiffness of the wall,and the horizontal ultimate bearing capacity also gradually decreases,but the greater the aspect ratio,the better the ductility;With the increase of the strength grade,the horizontal ultimate bearing capacity and initial stiffness of the wall are increased,but the ductility becomes worse.The paper has 48 pictures,14 tables and 71 references.