Research On Seismic Performance Of Prefabricated Autoclaved Aerated Concrete Slab Wall

Masonry structures are widely used in small and medium-sized cities and villages in my country due to their advantages such as simple construction,low construction and enclosure costs,excellent durability,good thermal insulation performance,and obvious energy-saving effects.However,through the existing seismic damage data and engineering application,it can be found that the masonry structure also has problems that need to be solved urgently.First of all,traditional masonry walls are destroyed by earthquakes due to their self-weight and poor tensile strength.Second,most traditional masonry walls are made of clay bricks.Traditional clay bricks have serious shortcomings such as high energy consumption,low construction efficiency,and poor seismic performance.Finally,the traditional on-site construction of masonry walls has low construction efficiency.On the other hand,it is difficult to guarantee the quality of manual construction by workers,which will cause environmental pollution and generate a large amount of construction waste.In order to solve the problems of traditional masonry structures,improve the seismic performance of such structures.This article is aimed at a prefabricated autoclaved aerated concrete slab wall,which has the advantages of light weight,high strength,good seismic performance,energy saving and environmental protection,and convenient construction.Through pseudo-static tests,the seismic performance is studied,and a finite element model is established.Numerical simulations are carried out considering factors such as different vertical compressive stresses,structural measures,aspect ratios,wallboard strength grades,and whether or not they are reinforced.The paper mainly completed the following tasks:(1)The basic mechanical properties of autoclaved aerated concrete blocks and masonry mortar were tested,and the basic mechanical indexes of the test wall were determined,which provided the basis for the seismic analysis of the wall,the calculation of the bearing capacity and the establishment of the finite element model.(2)A pseudo-static test of four AAC board walls was carried out to study the failure mode,hysteretic characteristics,seismic shear strength,energy dissipation performance,deformation performance and stiffness degradation of the wall,and the seismic performance of the wall was studied.A comprehensive analysis was carried out.The influence of structural measures and vertical pressure on the seismic performance of the wall is studied.(3)Check calculation formula for seismic and shear bearing capacity of AAC slab wall.On the basis of the test,according to the material characteristics and force characteristics of the AAC panel structure wall,the corresponding check calculations were carried out according to the calculation formula of the shear bearing capacity given by the code.The test value and the calculated value of the formula are compared and analyzed.The two values are in good agreement and have a certain degree of safety.They can provide references for the calculation and research of the shear bearing capacity of AAC slab walls,and also provide a theoretical basis for the engineering application of this type of wall..(4)Based on experimental research and analysis,a finite element model was established.Considering factors such as vertical compressive stress,structural measures,aspect ratio,wall panel strength grade and whether or not there is reinforcement,the force characteristics of the wall are analyzed.According to the results of finite element analysis,the failure mechanism and ultimate bearing capacity of the wall under different parameters are discussed.