The Mechanics Properties Analysis Of Core Tubular Stainless Steel Slab L-shaped Compressed Column

The core tubular stainless steel slab(CTS)L-shaped column is a prefabricated stainless steel structure welded by stainless steel slab.The CTS L-shaped column combines the advantages of both sandwich structures(i.e.high specific strength,excellent sound insulation and thermal insulation,light weight)and stainless steel(i.e.strong corrosion resistance,high machinability and environmental suitability).The novel special-shaped column has been found increasingly wide applications in fabricated structures in China.Therefore,the novel structure can play a significant role in the field of fabricated steel structure.Therefore,the research of the CTS L-shaped column have been a hot topic in the academic field.The primary objective of this study is to conduct an experimental and analytical study about the axial compressive capacity of CTS and the main contents are as follow:(1)6 CTS L-shaped columns under static loading were tested.The conclusion that the weld of the CTS L-shape columns was intact when reaching the ultimate bearing capacity can be drawn by the experimental results,which can be explained by the fact that the integrity of weld can be guaranteed by the weld strength before the specimens failed.For the CTS L-shaped columns,the stainless steel core tube can be applied to part of axial load.The mechanical behavior can be improved significantly due to the interaction between the slab and the stainless steel core.Moreover,the partial buckling of steel tube can be delayed effectively.(2)The finite element model of the CTS L-shaped columns was established by finite element software(ABAQUS).The reasonability and validity of the finite element model have been demonstrated through the comparison between experimental results and FEA results.It can be concluded that the FE model can be adopted to carry out the analytical analysis of the CTS L-shaped columns.(3)Parametric studies were performed to investigate the failure mechanism of the local buckling of the CTS L-shaped columns,which can be divided into three status:Panel buckling failure,Panel buckling failure and compression failure of core tubes and Local bearing failure of core tubes.(4)Based on the finite element model,numerical analysis was conducted for the mechanical property of the CTS L-shaped column under axial compression.The resultsshow that: under the same panel thickness,compression stiffness nearly can’t be affected by core tubes thickness and panel thickness;Considering single parameter’s influence,with the increase of tubes thickness and panel thickness,the capacity of axial ultimate compression is increasing;With the increase of vertical space of core tubes and slenderness ratio,the capacity of axial ultimate compression is decreasing;The limit value when Local instability of structure happened is about 80,little more than code propose.(5)In order to investigate the mechanical behavior of the CTS L-shaped column subjected to eccentric load,numerical analysis was carried.The results show: with the increase of eccentricity,tensile stress zone appears,the ultimate compression decrease;Under the same eccentricity,different load angle have different influence on the compression capacity,and the min ultimate compression is less 40% than the max ultimate compression which caused by load angle.Considering single parameter’s influence,the vertical space of core tubes has huge influence on load angle,and the panel and tube thickness nearly have no influence on load angle.