Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Impact Treatment of Highway Bridge Welds to Enhance Durability of Steel Bridges: Mechanism, Limitations, and Design
Residual stress-based 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 are introduced in this paper.
Impact Treatment of Highway Bridge Welds to Enhance Durability of Steel Bridges: Mechanism, Limitations, and Design
Residual stress-based 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 are introduced in this paper.
Impact Treatment of Highway Bridge Welds to Enhance Durability of Steel Bridges: Mechanism, Limitations, and Design
Ghahremani, K. (Autor:in) / Walbridge, S. (Autor:in) / Topper, T. (Autor:in)
Structures Congress 2018 ; 2018 ; Fort Worth, Texas
Structures Congress 2018 ; 24-34
17.04.2018
Aufsatz (Konferenz)
Elektronische Ressource
Englisch
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