Study On Seismic Behavior Of B06 Desert Sand Autoclaved Aerated Concrete Masonry

The wall materials used in masonry structure are mainly clay bricks,which have been banned in most parts of the country,so it is increasingly important to find new building materials to replace clay bricks for masonry structures.Autoclaved aerated concrete blocks have obvious advantages in physical and mechanical properties.They are an ideal substitute for clay bricks.The main raw materials are sand,lime,cement,gas generator,slag,fly ash,and conditioner.And bubble stabilizers.This research group combines the rich characteristics of desert sand resources in the northwest region,and innovatively uses desert sand for the preparation of autoclaved aerated concrete materials,in order to replace ordinary river sand,and develop a new type of desert sand autoclave.Gas concrete block,this kind of building material has many similarities with the composition and characteristics of ordinary aerated concrete.In particular,the SiO₂content in desert sand is close to that of ordinary sand,clean,almost free of mud,and free of chlorides.Therefore,it can be used as engineering sand.This paper mainly studies the?B06?desert sand autoclaved aerated concrete material from the following aspects:First,the basic mechanical properties of masonry were measured,and the compressive and shear specimens of M5.0,M7.5 and M10 mortar strength were respectively built.The compressive failure modes and shear failure modes of the masonry were observed through test phenomena.The failure mode of the masonry bearing capacity is analyzed,and the factors affecting the compressive strength and shear strength of the masonry are analyzed.The test results show that with the improvement of mortar strength,the compressive and shear strength of the desert sand autoclaved aerated concrete masonry will increase.The block itself is bulky and the masonry of the masonry is good.Therefore,the strength utilization rate is high.Finally,the formula for calculating the compressive and shear resistance of the block masonry is fitted through the test results.The theoretical calculation value is in good agreement with the experimental value.Then the seismic performance of block wall structure is studied through low-cycle repeated load test.In this test,three pieces of aerated concrete wall with constraint structure column and three pieces of plain aerated concrete block wall are respectively constructed.The wall dimensions were the same,and they were simulated under three different vertical stress ratios.Static contrast test,finally obtained information such as failure mode,hysteresis curve,skeleton curve,stiffness degradation curve,energy consumption rate,etc.,and compare test data.The test results show that the shear bearing capacity of the block wall increases obviously with the increase of vertical normal stress.The existence of the restrained structural column wall compared with the plain wall and the existence of the structural column constrains the development of the wall crack.Under the same normal stress,the seismic capacity of the structural column wall is higher than that of the plain wall.The presence of the structural column improves the seismic and shear resistance of the wall and improves the deformation capacity and ductility.The seismic performance of the new desert sand autoclaved aerated concrete block wall is analyzed.Finally,the calculation formula of seismic capacity of autoclaved aerated concrete masonry is proposed.The calculation results are compared with the experimental results.The agreement is excellent,and according to the xinjiang building atlas,a single-story building model with a fortification intensity of 8degrees is established for seismic bearing capacity checking calculation.The seismic performance of the block wall is verified and the block wall meets the seismic requirements under the fortification intensity of8 degrees.