Research On Mechanical Properties Of Prefabricated Autoclaved Aerated Concrete Panel Wall Structure

The prefabricated autoclaved aerated concrete panel wall structure takes the autoclaved aerated concrete panel instead of the block as the masonry unit of the wall,with large board size,factory prefabrication and efficient on-site installation.In this paper,the autoclaved aerated concrete panel wall structure is studied systematically.The main research contents and conclusions are as follows:(1)Experimental study on compressive performance of autoclaved aerated concrete panel masonry: the compressive strength of 18 masonry in 6 groups is tested to study the compressive failure characteristics and failure mechanism of autoclaved aerated concrete panel masonry.The experiment indicates that the compressive strength of masonry can be ameliorated by increasing that of autoclaved aerated concrete,but the improvement of masonry strength is less than that of material strength.In the end,the recommended formula of masonry compressive strength and the compression constitutive equation are presented.(2)Experimental study on shear performance of autoclaved aerated concrete panel masonry: The shear strength along joint tests were conducted on 3 groups of 9 masonry.The results suggest that the shear strength along joint of panel masonry bonded with adhesive equals to around 3 times that of masonry bonded with mortar which equals to that of traditional autoclaved concrete block masonry.The recommended formulas of shear strength along joint of autoclaved aerated concrete panel masonry with mortar and adhesive are given respectively.(3)Experimental study on seismic performance of autoclaved aerated concrete loadbearing panel wall: quasi-static test was carried out on four autoclaved aerated concrete loadbearing panel walls to analyze the influence of vertical compressive stress,cementitious materials,structural measures and other factors on the seismic performance of the wall.The horizontal mortar joint of the bearing wall with mortar bonding between the panels cracked earlier,and the masonry was shear resistant by relatively independent panel element under the constraint of the concrete frame.When the vertical compressive stress is increased from 0.3MPa to 0.6MPa,the seismic bearing capacity of the wall can be increased by 26%,but the wall with the compressive stress of 0.6MPa will fail rapidly once it reaches the seismic bearing capacity,showing the characteristics of brittle failure;the horizontal joints of the bearing wall with adhesive bond between the panels are almost not cracked during the loading process,and the wall integrity is better.Under the same compressive stress,the bearing capacity,energy consumption,stiffness and other performance of the adhesive bonded masonry wall are significantly higher than those of the mortar masonry wall,and the drift of the adhesive bonded masonry wall is greater than 1 / 100 when it is damaged,so it has better deformation capacity;the bearing capacity of the composite wall with staggered vertical joints is equivalent to that of the whole wall,however,the bearing capacity of the composite wall falls off slightly faster in the later stage of loading,and the composite wall with staggered vertical joints is easy to produce plastic deformation at the vertical joints,so its energy consumption capacity is better than that of the whole wall.(4)Theoretical analysis of seismic shear capacity calculation of autoclaved aerated concrete panel wall: considering the constraint effect of steel mesh embedded in the panel on autoclaved aerated concrete,the calculation formula of seismic capacity of AAC concrete panel wall is introduced on the theory of the inclined strut,and the calculation results are in conformance with the experimental results.(5)Numerical simulation analysis of autoclaved aerated concrete load-bearing panel wall:Based on ABAQUS,the numerical calculation model of autoclaved aerated concrete loadbearing panel wall is established.The bearing capacity and failure characteristics of the simulation calculation conform to the results,which demonstrates that the finite element model is more reasonable.