Numerical Simulation Analysis And Theoretical Research On The Stressed Skin Diaphragm Of Light-gauge Steel Structures

Previously, profile sheets are still used as sheathing of the building in thedesigning of light steel structures, without considering of their structure function.Based on research and analysis, the sheets can work together with the framestructures if proper connections are made between the profiled steel sheets andsupport members, which can take the part of the loads and will increase the stiffnessof the whole structure. This kind of behavior of profile sheets is named the stressedskin diaphragm. Considering the influence of stressed skin diaphragm not only canreflect the working of structure but also obtain economic benefit.Based on the exist test, this paper adopts numerical analysis to simulate thestressed skin diaphragm, a finite element software, and establish three kinds of model.They are detailed model, finite element model and simplified model. By comparingthe detailed model calculation results and test results, verified the reliability of testresults and the correctness of the model. Then compared the detailed model, finiteelement model and simplified model, the error size is in our acceptable range. Andfinally the paper use the finite element to research the internal force distribution offasteners which are on purline in detail, the parameters such as sheet thickness, lengthand the number of purline.In front of the established model, the meshing is rough. By the theory of finiteelement, if we want to extract the stress diagram of the steel sheet, we should divide afiner mesh with the steel plate. Thus the stress diagram is more accurate and the erroris more smaller. So we study at the six kinds of working conditions, the internal forcedistribution of the fasteners and the equivalent stress of the steel plate.Then the fourth chapter is established the model with fasteners on purline andthe plate seam. Compared the load displacement curve of the model with the seamfasteners and without the seam fasteners. And changing the spacing of the seamfasteners effect on the shear performance of the skin body. Finally, it emphasizes theinternal force distribution of the fasteners on purline and plate seam at three kinds ofmodels. According to reasonable assumptions, this paper derives the simplified designformulas calculating strength and stiffness of shear pane, which is based on the resultsof test and finite element analysis. The simplified formulas are applied to the sheardiaphragm using profiled sheets connected by the self-tapping screws. Using theformulas to calculate the corresponding shear strength of the model and compare theresults with test data, the results acquired form the finite element analysis and theformulas of the reference. It is concluded that when the model has plate jointfasteners, the result from the formulas is more closer to the test result and the finiteresult.