Theoretical And Experimental Investigations Of Energy-saving Sandwich Composite Panels Used In Steel Residential House

Given that the reform of wall materials and the implementation of energy conservation of building are underway, the modernization of housing has gradually been on the top agenda. Due to the advantages including energy saving, land saving, eco-friendly steel structural houses which can be designed standardly, be manufactured in factories and be fabricated in sites have been increasingly more popular in China. However, there are still many drawbacks of steel structural house. At present, the cladding system is the most urgent problem which prevents the further development of steel structural houses.Composite panels are much better than other wall materials in terms of strengh and insulation. Therefore, it has been on the most rapid growth rate recently. When used in steel structural houses as cladding system, composite panels can be fixed on the steel frame beam or column to bear the horizontal loads, such as wind loads and earthquake force.The structural behaviour of composite panels are studied both experimentally and theoretically. First of all, the equation of computation for deflection of elastic slender parallelogram panel pinned at the four angles bearing transver uniform loads is derived from the general displacement theory of flexural parallelogram panel proposed by Fu Baolian, which can be used to calculate both the deflection and internal forces of parallelogram panel pinned at the four angles and makes the simplified calculation of the deflection and internal forces of composite panels possible.Second, a composite panel is modelled by generally used finite element analysis software-ANSYS. According to the references, the mechanical constitutive relations of materials,element types and the failure criteria can be used to model the elastic deflection of panels under transverse uniform loads. Because of the diversity of dimesion and opening of panels in reality, the influential factors of the flexural rigidity of composite panels are analysed and the key factors are summarized, and some suggestions about panel design are also proposed.Finally, experimental study of five full-size composite panels is carried out to figure out the effect of size,opening and ratio of reinforcement on the cracking force and ultimate flexural strength of composite panels under transverse uniform loads, and the distribution of cracks,the failure state and the compositeness are also studied. The results of ANSYS are in good agreement with those of experiment. The experimental data and the results of nonlinear finite element analysis can be used in the future research and design.