Study On Seismic Behavior Of Interlocking Compressed Earth Hybrid Wall

Earth materials not only have the advantages of local materials and convenient operation,but also can meet the environmental requirements of low energy consumption and less pollution.In view of the shortcomings of poor integrity and low material strength of traditional earth structure,researchers at home and abroad have done a lot of research on earth material performance and molding process,and put forward interlocking compressed earth bricks on the basis of modified materials.Through the interlocking mechanism of protrusions and concave cavity,the interlocking compressed earth bricks are occluded and connected,which reduces the dependence on mortar,speeds up the construction of earth buildings,and conforms to the development trend of standardization and assembly.In this paper,the seismic performance of interlocking compressed earth hybrid walls is studied.The main research contents are as follows:(1)In this paper,according to the size of the gable and interlocking compressed earth bricks of adobe houses in villages and towns,interlocking compressed earth wall components are designed and manufactured.The cast-in-place concrete structural columns and connecting beams are set on both sides and middle of the wall respectively to form the Earth hybrid structure.The hysteretic curve,skeleton curve,stiffness degradation curve and energy consumption capacity of the wall components are obtained by quasi-static test.The results show that the restraint effect of concrete beams and columns is obvious,and the wall has better bearing capacity and energy consumption capacity.(2)The finite element model of the test wall was established by ABAQUS software.C3D8R unit is used for concrete and interlocking compressed earth wall,and T3D2 unit is used for reinforcement.Binding constraints are used to connect the interlocking compressed earth wall and concrete beam column.Compared with the experimental results,the bearing capacity and stiffness of the wall obtained by the numerical simulation change about 10%,and the larger stress in the PEEQ cloud diagram is more consistent with the serious damage position of the wall,which verifies the effectiveness of the model.(3)Based on the experimental wall model,the effects of vertical compressive stress,aspect ratio,location and number of concrete beams,location and size of openings and types of openings on the seismic performance of the wall are considered.The results show that the vertical compressive stress,the ratio of height to width and the setting of concrete beams have obvious influence on the seismic performance of the wall.The opening area of the wall is not easy to be too large,and it should be avoided to set door and window openings on the wall at the same time.The research results of this paper have reference value for the theoretical research and practical application of interlocking compressed earth hybrid structure.