Abstract
This study develops a finite element analysis model to predict the ultimate strength of the base metal block shear fracture based on previous experimental results and compares the experimental results with the analysis results to verify the effectiveness of the analysis model. This study also analyzed additional variables of the welding direction and weld length on the applied load to investigate the structural behaviors and fracture conditions. In addition, predicted strength according to the analysis results were compared with those by the current design equations, and the equations proposed by previous researchers. As a result, the design formula by the current design equations, such as Korea Building Code (KBC)/American Institute of Steel Construction (AISC) and European Code (EC3), and the equations proposed by Oosterhof and Driver underestimated the base metal block shear strength of ferritic stainless steel by up to 42%. Equations suggested by Topkaya and Lee et al. for carbon steel and austenitic stainless steel welded connections provided more accurate strength predictions, while they did not reflect the difference of material properties. Therefore, this study proposed a modified strength equation for ferritic stainless steel welded connection with base metal block shear fracture considering the stress triaxiality effect of the welded connection and the material properties of ferritic stainless steel.
Highlights
IntroductionAs a structural material of buildings or infrastructure, stainless steel has important characteristics such as corrosion resistance, durability, fire resistance, and aesthetics compared to carbon steel
As a structural material of buildings or infrastructure, stainless steel has important characteristics such as corrosion resistance, durability, fire resistance, and aesthetics compared to carbon steel.the use of stainless steel as nonstructural members of interior and exterior materials, as well as structural members of buildings at home and abroad, has been increasing recently
This study examines the stress and strain distribution of welded connections based on the previous experimental results of ferritic stainless steel (STS430) fillet-welded connections with base metal block shear fracture and develops a finite element analysis model to predict the ultimate strength of welded connection with the base metal block shear fracture
Summary
As a structural material of buildings or infrastructure, stainless steel has important characteristics such as corrosion resistance, durability, fire resistance, and aesthetics compared to carbon steel. In Korea, recently, many researchers have performed studies on structural behaviors, such as fracture mode and ultimate strength of bolted and welded connections of thin-walled (cold-formed) stainless steel plates through experimental and analytical methods [6,7,8,9]. Performed an experimental study on the ferritic stainless steel (STS430) welded connection with base metal block shear fracture and evaluated the ultimate strength depending on the length of the weld line according to loading direction. It was found that the current design equations for carbon steel welded connections did not consider the shear lag effect, stress triaxiality effect, and stress distribution factor in the critical fracture section for ferritic stainless steel welded connection. A modified block shear strength equation considering the effects of the stress triaxiality on ultimate strength, stress distribution at the critical block shear section of ultimate state and weld length of the ferritic stainless steel welded connection was proposed
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