Research On Mechanical Properties Of Iron Sheet Baking Painted And Aluminum Alloy Runner Ceiling Joints

As a typical non-structural component,the proportion of investment in public buildings has been increasing in recent years,and seismic damage data shows that the seismic damage of ceiling systems is also relatively serious.Existing earthquake damage data and shaking table tests have shown that the failure of the suspended ceiling system is caused by the failure of the runner grid,and the various joints of the suspended ceiling system are related to the integrity of the runner grid.Scholars have conducted a large number of shaking table tests and numerical simulations on the entire suspended ceiling system,but there is little research on the mechanical properties of various joints of the suspended ceiling,Especially there is limited research on the commonly used iron sheet baking painted runner and aluminum alloy runner in China.Based on the above,this paper focuses on the internal joints of iron sheet baking painted runner and aluminum alloy runner suspended ceiling,and carries out the following work:(1)Considering the runner material,runner section,structural measures and other factors,the monotonic Tensile testing test and hysteretic loading test of five types of internal joints(main-cross runner joint,main-main runner joint,main-perimeter runner joint,main-hanger piece joint,main-hanger wires joint)between the iron sheet baking painted runner and the aluminum alloy runner ceiling were designed and conducted,a total of 168 groups.(2)Based on experimental data,the tensile failure modes and mechanisms of various joints were analyzed;Explored the effects of factors such as cross-sectional size,construction measures,processing technology,and material properties on the mechanical performance of joints;Clarified the control factors for the ultimate load of joints;Proposed suggestions for engineering applications.(3)Based on the analysis of joint tensile performance,the hysteresis performance,skeleton curve,and energy dissipation capacity of various joints were analyzed;Clarified the control factors for joint hysteresis failure;The mechanisms of joint tensile failure and hysteresis failure were compared and analyzed.(4)Conduct experimental vulnerability analysis on various joints and obtain vulnerability curves for each type of joint.Compare and analyze the vulnerability of each type of joint;And based on the Pinching4 model in the finite element analysis software Opensees,force displacement hysteretic model for various joints were established,providing reference for the seismic performance research and engineering design of suspended ceilings.