Experimental Study On Vertical Bearing Capacity Of Light Steel Keel Porous Concrete Composite Wall

With the popularization of green buildings and the development of energy-saving technologies,various new wall materials have been popularized and promoted.The light steel keel porous concrete composite wall is a sandwich wall formed by filling a porous concrete mixture into a wall skeleton cavity formed by a light steel keel and a fiber cement pressure plate by a pumping infusion process,the wall having green,light insulation,fireproof,soundproof and easy to construct.In this research,the combination of test and simulation is used to study the light steel keel porous concrete composite wall with or without perforated concrete and self-tapping screws with spacing of 200 mm,300mm and 400 mm respectively.Firstly,the vertical bearing capacity test of light steel keel porous concrete composite wall under different conditions By analyzing the influence of the perfusion porous concrete on the mechanical behavior and failure mode of the wall,and changing the influence of the self-tapping screw spacing on the mechanical behavior and failure mode of the wall,it is kNown that the light steel keel composite wall of the internal perfusion porous concrete The ultimate bearing capacity is 69.10% higher than that of the unfilled porous concrete light steel keel composite wall.Based on the composite wall with the self-tapping screw spacing of 300 mm as the reference,the ultimate bearing capacity of the light steel keel porous concrete composite wall with the self-tapping screw spacing of 400 mm is reduced by 2.46%,and the light steel keel porous concrete with the self-tapping screw spacing of 200 mm is 200 mm.The ultimate bearing capacity of the composite wall is increased by 8.40%.Second,based on the analysis of the testing data,Using ABAQUS finite element software to make the vertical bearing capacity of the wall simulate with the form of destruction.By comparing the load-displacement curve and the stress cloud diagram,the simulation results and the tested results were basically the same,with an error of no more than 10%.This result verified the accuracy and credibility of finite element modeling and analysis.The reason for the error was analyzed as follows: First,the material properties of the materials in the simulation were ideally assigned.Second,during the model establishment the joints of the fiber cement pressure plates of the composite walls were not taken into account,thus the ultimate bearing capacity of the composite walls acquired from simulation was slightly improved.Finally,using ABAQUS finite element software,the influence of wall height and axial compression ratio on the vertical bearing capacity of composite wall is analyzed by adjusting the simulation parameters.It can be seen from the simulation results that the height of the wall of the composite wall has an important influence on the vertical bearing capacity of the wall.When the height of the wall column is between 800 mm and 1600 mm,the vertical bearing capacity of the composite wall gradually increases with the height of the wall.When the height of the wall is between 1600 mm and 3000 mm,the vertical bearing capacity of the composite wall gradually decreases with the increase of the height of the wall.The axial compression ratio of the composite wall is controlled within the range of 0.1-0.4.The vertical bearing capacity of the wall increases with the increase of the axial compression ratio,the displacement decreases,the deformation capacity decreases,and the reverse bearing capacity of the composite wall decreases,the ductility deteriorates.