Light Steel Skeleton Cement Fly Ash Foam Wall Panel Load-bearing Capacity Study

Light steel skeleton cement fly ash foam wall panel is a multi-functional composite wall panel integrating load-bearing,heat preservation and maintenance,which has the advantages of solid waste utilization,cost saving and green environmental protection.Compared with the traditional structure,it has the advantages of less steel,lighter weight,faster construction speed and conducive to the development of building industrialization,and is a new type of composite wall panel with good application prospects.In this paper,the axial compressive performance and seismic performance of light steel skeleton cement fly ash foam wall panel are studied,and the main work and results are as follows:(1)In order to improve the property of foamed cement fly ash easy to crack under load,polypropylene fiber was added to the foamed cement fly ash test block for material property test,and the compressive strength test and dry density determination of different cement dosage test blocks were carried out,and the test results showed that the addition of 0.4% polypropylene fiber in foamed cement fly ash had the effect of increasing compressive strength and reducing dry density;The strength and dry density of foamed cement fly ash increase with the increase of cement dosage and increase in linear proportion.(2)Through the vertical axial compression performance test of light steel skeleton cement fly ash foam wall panel,the effects of the number of columns,cement dosage and fiber doped fibers on the vertical axial pressure performance of the composite wall panel were studied,and the test results showed that the increase of the number of columns,the increase of cement content and the appropriate amount of polyprop ylene fiber content could improve the bearing capacity of the wall panel,but the addition of polypropylene fiber would reduce the bonding performance between the filler and the light steel skeleton,and reduce the supporting effect of the filler on the column.(3)Through the low-cycle reciprocating horizontal load test of light steel skeleton cement fly ash foam wall panel,the seismic performance of the wall panel was evaluated from the aspects of strength,deformation and energy dissipation.The effects of the number of columns,cement dosage,fiber addition and splicing of composite wall panels on the seismic performance of wall panels were studied,and the experimental results showed that increasing the number of columns could better improve the ductility and energy dissipation capacity of composite wall panels.Increasing the amount of cement and adding 0.4% polypropylene fiber can improve the ductility,energy dissipation capacity and shear strength of the composite wall panel,and the addition of polypropylene fiber to the wall panel has the effect of slowing down crack development and enhancing the overall performance of the wall panel.After the splicing and combination of wall panels,the integrity of the wall panel is better and the seismic performance is slightly improved,indicating that the combined wall panel can be assembled and used on site after factory prefabrication production.(4)The vertical axial compression and low cycle reciprocating horizontal load simulation analysis of the wall panel was carried out,the simulation results were consistent with the test,and the parameters of the wall panel were analyzed,and the analysis results showed that changing the column spacing mainly affected the lateral stiffness and deformation ability of the composite wall panel,and had little effect on the vertical bearing capacity.The strength of foamed cement fly ash is the key factor affecting the vertical bearing capacity and seismic performance of composite wall panels.Increasing the thickness of steel can significantly improve the vertical bearing capacity of wall panels;With the increase of axial compression ratio,the lateral bearing capacity and deformation capacity of the composite wall panel are weakened.