Influence Of Aspect Ratio And Mortar Strength On Seismic Behavior Of Horizontal-hole Interlock Hollow Block Walls

Considering the structure of earth brick masonry cannot meet the requirement of green and sustainable development,it will not be used extensively in the construction of new-type urbanization any more.Hence,a new type of structure,horizontal-hole interlock hollow block shear wall masonry is proposed.This structure has the following advantages: 1.Convenient and quick for construction.2.Save mortar.3.Environmental protection.4.Excellent thermal insulation.In China,where earthquake happens frequently,the seismic performance of masonry is essential for structural safety.Therefore,this paper studies the seismic performance of the horizontal-hole interlock hollow block shear walls.First,a pseudo static test was carried out on three horizontal-hole interlock hollow block shear walls.All the specimens are in full-size.Wall 1 is the control group,wall 2 is the specimen with a higher aspect ratio(H/L=1.51)and Wall 3 is the specimen with higher mortar strength(Mb15MPa).The crack development and failure mode of specimens were observed;the hysteresis curves,skeleton curves,stiffness degradation,energy dissipation coefficient and ductility coefficient were obtained;the effects of aspect ratio and mortar strength on the seismic performance of specimens are discussed;also,the seismic behavior of horizontal-hole interlock hollow block masonry was compared with traditional masonry.Then,the experiment was simulated with homogenized method and discrete method.The failure mode and shear capacity of homogenized models and discrete models were compared.Following conclusions have been draw:(1)the specimen with aspect ratio(H/L=1.5)was failed mainly in bending,while the specimens with the normal aspect ratio(H/L=0.96)failed mainly in shear.(2)The initial stiffness,shear bearing capacity,ductility and energy dissipation capacity of the specimens with higher mortar strength are greater than that of the control group.(3)While the initial stiffness,shear bearing capacity,ductility and energy dissipation capacity of the specimens with higher aspect ratio are smaller than that of the control group.(4)The homogenized method can greatly reduce the processing time,and the discrete method can effectively estimate the crack pattern and failure mode of the specimen.The seismic performance of horizontal-hole interlock hollow block masonry shear walls can be predicted effectively by both two methods.