Forensic Investigation

Single Abstract

343225 - Finite Element Study on a Welded Connection Detail Susceptible to Hot-Dip Galvanizing Cracking

Saturday, April 21
8:00 AM - 9:30 AM
Location: 202B

Hot-dip galvanizing is widely used to prevent corrosion of exposed structural steel elements. Hot-dip galvanizing involves submerging steel components in a bath of zinc at a temperature of approximately 840F to form a metallurgically-bonded zinc coating. On occasion, cracking has occurred in galvanized structures, seemingly induced during the galvanizing process. Such occurrences have created great concern amongst designers, galvanizers, and fabricators around the world, resulting in much research over the past three decades. However, there still does not exist a well-developed understanding of this phenomenon due to some practical difficulties. It is expensive and highly challenging to perform physical tests under hot-dip galvanizing conditions, and additionally, it is difficult and computationally expensive to approach the problem using analytical techniques.
This paper describes a finite element procedure that has the capability to capture the effects of both welding and galvanizing processes on a welded connection detail that sustained cracking during hot-dip galvanizing. The finite element analysis software Abaqus was used in conjunction with the plug-in Abaqus Welding Interface (AWI) to model the welding process. The simulations captured residual stresses produced by the welding process. The whole as-welded component was then subjected to the hot-dip galvanizing process through a thermal simulation specified using an Abaqus user-subroutine. The parameters of the study were fabrication and hot-dip galvanizing practices such as welding sequence, welding heat input, connection geometry, dipping angle, dipping and removing velocity, and submerging time. The results of this study are expected to provide guidance to engineers, detailers, and fabricators regarding the susceptibility of detail to cracking during hot-dip galvanizing.

Kien Q. Nguyen

Graduate Research Assistant
University of Kansas

Kien Nguyen is pursuing a PhD degree in Structural Engineering at the University of Kansas, USA. He spent four years working as a Design Engineer at Kirby Building Systems in Vietnam where he designed more than twenty steel building projects. He also worked as a Lecturer during the same four years at Saigon Technology University after earning his B.S. (2008) and M.S. (2011) in Vietnam and South Korea, respectively. Both careers have emboldened his mind to take the path of a Ph.D. program, which he plans to complete in May 2018. After completion of his Ph.D. program, he will continue his exciting journey in Structural Engineering.


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Adolfo B. Matamoros

Peter T. Flawn Professor
University of Texas at San Antonio

Adolfo B. Matamoros is the Peter T. Flawn Professor in the Department of Civil and Environmental Engineering at the University of Texas at San Antonio. He received his MS and PhD degrees in civil engineering for the University of Illinois at Urbana-Champaign in 1994 and 1999, respectively, and the degree of Licenciado from the University of Costa Rica, in 1989. His research interests include reinforced concrete columns, high-strength concrete, seismic evaluation of older reinforced concrete buildings, shear strength of reinforced concrete and prestressed members, simulations of the nonlinear response of reinforced concrete structures, and fatigue and fracture of steel bridges.


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Jian Li

Assistant Professor
University of Kansas

Jian Li is an assistant professor in the Department of Civil, Environmental and Architectural Engineering at the University of Kansas. He received his MS in 2007 and BS in 2005 from Harbin Institute of Technology in China and his Ph.D. in 2013 from the University of Illinois in Urbana-Champaign, all in Civil Engineering. His research focuses on both theoretical and experimental developments of advanced sensing and health monitoring techniques to improve the resiliency and sustainability of civil infrastructure under operational and extreme loading conditions. His specific research interests include vibration-based damage detection and model updating, wireless smart sensor networks, innovative sensing techniques, computer vision, uncertainty quantification, risk assessment and mitigation. His research is currently funded by various agencies including National Cooperative Highway Research Program, Transportation Pooled Fund Program, Mid-American Transportation Center, and Kansas Department of Transportation.


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Arturo Montoya


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Reza Nasouri


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343225 - Finite Element Study on a Welded Connection Detail Susceptible to Hot-Dip Galvanizing Cracking

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