Bridge Analysis, Design and Repair

Single Abstract

339115 - Impact Treatment of Highway Bridge Welds To Enhance Durability of Steel Bridges: Mechanism, Limitations, and Design

Saturday, April 21
8:00 AM - 9:30 AM
Location: 201B

Residual stress-based treatments (i.e. peening or impact treatments) are proven to be an effective, reliable, and economical means for extending the service lives of steel bridges. When these treatments are applied, a compressive residual stress field is introduced near the surface of the treated weld toe, which delays, or even arrests, the growth of small fatigue cracks. Recently, the fatigue life increase resulting from impact treatments has been acknowledged in the International Institute of Welding (IIW) Recommendations by explicitly permitting an increase in the structural stress class due to the treatment of non-load carrying welds from FAT-100 up to FAT-125. This presentation summarizes a comprehensive research program and case studies that were undertaken with the goals of examining the fatigue performance of treated highway bridge welds in the high cycle domain under simulated in-service loading conditions and developing S-N design curves for stress design of treated weld toes. In particular, the concept of using S-N design curves with m = 5, instead of the traditional m = 3, for the structural stress design of treated weld toes will be introduced in this presentation.

Kasra Ghahremani

Engineer
Walter P Moore

Kasra Ghahremani, Ph.D., P.Eng., M. ASCE is a Structural Diagnostics Engineer with Walter P. Moore in Houston, Texas. He received his Ph.D. from the University of Waterloo. Dr. Ghahremani’s research during his graduate studies was primarily focused on the fatigue performance, assessment, and retrofitting of metal structures in the long-life regime. His research outcomes have been published in co-authorship with his scientific advisers and other collaborators in 20 journal and conference research papers. Prior to joining Walter P Moore, Dr. Ghahremani was a Post-Doctoral Research Fellow at George Mason University conducting research on detecting structural damage in 3D point clouds.

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339115 - Impact Treatment of Highway Bridge Welds To Enhance Durability of Steel Bridges: Mechanism, Limitations, and Design



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