| Compared to carbon steel structures,stainless steel structures provide excellent corrosion resistance and durability,which offers a solution on the material aspect to the corrosion and maintenance p roblems for carbon steel structures.Stainless steel structures also meet the need of promoting environmentally friendly steel structures in China.The beam-to-column connection serves as an important part to ensure the safety of steel structures by transferring forces between structural members and contributing to the energy dissipation.Since the anti-slip performance of stainless steel structures cannot meet the specification requirement at the present,the welded connection should be the preferred form of stainless steel beam-to-column connection.Considering the disparities in material properties between stainless steel and carbon steel and the lack of research in the field of the stainless steel welded connection,this paper was aimed at studying the m echanical behavior of the duplex stainless steel welded beam-to-column connection with the use of finite element method(FEM).The main contents are as follows:(1)The finite element model was validated by employing experimental results of beam-to-column steel connections from previous literatures.The results showed that the finite element model could accurately stimulate the mechanical behavior of beam-to-column steel connections,including the load displacement curve and the failure mode of experimental results.Therefore,the finite element result of the following parametric analysis could be proved accurate and reliable.(2)Validation of the design provisions of the panel zone from the American,European,Japanese and Chinese design codes for the appl icability of stainless steel structures was conducted.These four design codes were first analyzed and compared,their major difference was the way how the enhancement of panel zone resistance by its surrounding plates was considered.Using the validated finite element model,the parametric analysis on the panel zone resistance was conducted.The parameters included the form of connection,the material of connection,the thickness of panel zone,the height of column web and the axial force ratio.By compari ng the finite element results and the design resistance of the four design codes,the applicability of the carbon steel design provision in stainless steel structures was analyzed.(3)The structural behavior of the stainless steel welded beam-to-column connection was studied based on FEM.By analyzing four types of mechanical response indices of the four paths in the beam-to-column connection where fracture was most likely to happen,the structural behavior of four types of welded access holes recommended by the Chinese and American design codes were studied and compared.In addition,the safety behavior of the welded connection form recommended by the American design code was checked,which provided reference for the structural design of welded beam-to-column connections of the Chinese stainless steel design code. |
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