The Interfacial Failure Mechanism Research For Foam Concrete Composite Wall Panels

The industrialization of buildings and the industrialization of housing and the construction of urbanization require the active promotion of prefabricated buildings.The assembled energy-saving composite wall panels are widely used and popularized for their excellent characteristics.The foam concrete composite wallboard studied in this paper is a kind of new type of assembled wallboard.It has the advantages of convenient installation and construction,good integrity,short construction period,low cost,energy saving,environmental protection,thermal insulation and light earthquake resistance.Therefore,the implementation of the foam concrete composite wall panel structure in the prefabricated building can effectively improve the seismic performance of the building.In the foam concrete composite wallboard,the frame beam and the frame column cast by concrete and the wallboard cast by foam concrete inside have a secondary pouring interface during the pouring process.This interface is a weak link of the structure,and the interface bonding quality is foam concrete.The overall performance of the composite wallboard has a key impact,and the factors affecting the interface failure mechanism are concrete strength,foam concrete strength,interface roughness and interface reinforcement.For this purpose,the test method is used to design A,B,The effects of concrete strength,foam concrete strength,interface roughness and interface reinforcement on the interface failure mechanism were studied in the three groups of concrete and foam concrete composite members.The main research contents are as follows:1.The test pieces are divided into 3 groups(Group A,Group B,Group C).Group A studies the effects of foam concrete density and interface roughness on the bond-slip properties of concrete and foam concrete composite members.Group B studied the effects of concrete strength and interface contact area on the bond-slip properties of concrete and foam concrete composite members.Group C was studied for interfacial adhesion with joint reinforcement.2.By observing and analyzing the interface failure modes of the specimens of group A and group B,the interface failure law of concrete and foam concrete composite members is summarized.The test data of the test pieces of Group A and Group B were analyzed and processed,and the initial sliding bond strength,ultimate bond strength and characteristic value bond strength of each test piece were summarized.The Excel software was used to draw the interface curve and graph of the concrete and foam concrete composite members,and the relationship between the influencing factors and the bond strength of the interface characteristics of the composite members was obtained.The multi-curve fitting of the standard curve of the A-group specimens was carried out by Origin9 software,and the interfacial bond-slip constitutive equations of the composite members under different foam concrete densities were obtained.3.By observing and analyzing the interface failure mode of the specimens of Group C,the interface failure law of concrete and foam concrete composite members with connecting steel bars was summarized,and the failure modes of concrete and foam concrete composite members of Group A and Group B were compared.Analyze and process the test data of the test specimens of Group C,draw the graphs of the test pieces of Group C,and combine the theoretical formulas obtained by excellent personnel at home and abroad to infer the interface mechanical componentsof concrete and foam concrete composite members.The key role of steel bars in the interface between concrete and foam concrete composite members is analyzed,and the bearing capacity of composite members under different reinforcement ratios is compared.