A Study Of Bearing Capacity Of Precast Sandwich Composite External Wall Panels And Connections Of Fabricated Steel Structure Residences

With the continuous advancement of modernization of China’s construction industry,the application of fabricated steel structure in multi-storey residences and highrise residential buildings has become more and more extensive,leading to the development and progress of green wall materials.However,there is a lack of superior products,safe and reliable connections and the corresponding design methods and standards in terms of inner and external wall panel of steel structure houses in China.Therefore,it is urgent to study the new external wall panels with high quality and strength,energy conservation,environmental protection and advanced degree of prefabrication.Meanwhile,flexural behavior is studied through tests and the finite element method.The main research work carried out in this paper is as follows:(1)carried out 1 group of tension test of upper connections,1 group of compression test of upper connections,1 group of tension test of lower connections,2 group of compression test of lower connections.3 components of connections can be found in each group.The research analyzes the tensile strength,bearing capacity,failure modes,flexibility,and strain distribution of upper and lower connections under tension and compression tests.The tests examine whether or not the two sandwich composite wall panels conform to the current standards in terms of tensile strength and bearing capacity.At the same time,we have put forward a basic calculation assumption by using finite element software ABAQUS.The ABAQUS software helps to establish a calculation model of tension compression test of connections in precast sandwich composite external wall panels based on geometric nonlinearity and material nonlinearity.The research also analyzes working mechanism and failure modes of connections in composite external wall panels under axial tension and pressure.Also,we have compared finite element analysis with experimental results,such as load-deflection curve,failure mode.Calculated results of the model were in good agreement with the test ones.(2)extended two groups of flexural behavior tests of concrete sandwich wall panels,analyzing influences of sizes of panels,openings and steel trusses on cracking load and ultimate flexural capacity of composite wall panels.Studies of crack distribution and failure modes are also conducted in the research.To test whether or not the connection of steel trusses can ensure the core materials of composite wall panels and inner and outer parts of concrete slab work together,the research also examines flexural behavior of precast sandwich composite wall panels.(3)established calculation model of flexural performance of precast sandwich composite external wall panels by using finite element software ABAQUS and the accuracy and rationality of the theoretical analysis model were verified by experiments.The research also studied influences of steel yielding strength,thickness of inner and outer parts of concrete slab and concrete strength on flexural behavior of precast sandwich composite external wall panels,at the same time,main influential parameters are gained during the whole process of the research.