Experimental Study On Seismic Performance Of Modified Activated Powder Concrete Reinforced Masonry Wall

As one of the important structural forms,masonry structure has been widely used in the early architecture at home and abroad.Due to the low strength of masonry structure,especially the characteristics of tensile,bending,shearing strength and brittleness of materials,and with the passage of time,some masonry structures in the early years did not meet the industry standards,in the event of earthquake and other disasters will cause serious damage,such old masonry structure houses need to be strengthened urgently.This paper presents an anti-seismic performance study of masonry wall under different reinforcement methods of modified active powder concrete(MRPC).To study more economical and efficient reinforcement methods.In the later stage,6 masonry walls with a ratio of 1:1.5 to mortar strength lower than that of M2.5 were designed.MRPC was used for double reinforcement,single reinforcement,scissors support,door reinforcement,well format reinforcement and unreinforcement.The seismic characteristics of wall under different reinforcement methods,such as failure mode,bearing capacity,ductility,deformation and energy dissipation,were studied through pseudo-static test.The results show that:1.Different reinforcement methods of MRPC can improve the brittle failure mode of the wall,and change the wall from simple brittle failure to partial plastic failure.2.The reinforcement of common brick wall by MRPC layer can improve the integrity of wall,and the bearing capacity of wall can be increased by 20 % to 168 % compared with that of unreinforced wall.3.The use of MRPC to reinforce ordinary brick walls has greatly improved the ductility of the walls.The displacement ductility coefficient of the walls is more than twice that of unreinforced walls,and the energy dissipation ability of the walls has increased significantly.The area of the wall's hysteresis ring has been increased by nearly 7 times.The energy dissipation coefficient has increased by 2 times;4.The common brick wall is reinforced by MRPC.The material is well bonded to the wall,and the surface layer and the wall are all the parts of the wall.The modified active powder concrete is used to strengthen the common brick wall.The material is well bonded to the wall,and the surface layer and the wall are all the parts of the wall.5.Compared with the anti-seismic performance of common brick walls under different reinforcement methods,the methods of double-sided reinforcement,single-sided reinforcement and scissors reinforcement are superior to those of door-type and well-form reinforcement.The wall integrity can be enhanced by using the method of double-sided and single-sided reinforcement,which can effectively restrain the development of cracks along the wall.6.The development of inclined cracks along the wall at 45° direction is effectively inhibited by the method of scissors support reinforcement,while the horizontal development of stepped cracks along the wall at 45 ° direction is inhibited by the method of door reinforcement.The reinforcement of well format has a certain inhibiting effect on the development of Wall crack,but the effect is less obvious because of the smaller width of each limb.7.The calculation expression of the ultimate bearing capacity of double-sided reinforced wall,single-sided reinforced wall and scissors reinforced wall is deduced.8.Using ABAQUS to simulate double-sided reinforcement,single-sided reinforcement and scissors reinforcement wall,the bearing capacity of the wall at various stages is close to the test value,but due to the differences between the simulation process and the actual test and the software limitations,the simulation value and the test value are different.