Analysis of Cracks and Stresses of Welded Attachments on Full-Scale Plate Girder under Fatigue Loading


Article Preview

In steel structure systems such as plate girder bridges and framed structures, fatigue damage used to occur at welded areas rather than primary structural members. These damages and behaviors of the welded attachments need to be extensively investigated so that the fatigue design criterion can effectively control the fatigue damage of steel structure systems. This study utilized a full-scale plate girder on which various welding attachments were mounted. The welded attachments investigated herein included flange gussets, web gussets, vertical stiffeners, and cover plates. The fatigue cracks initiated at the longitudinal end of joint area of the weld bead and the parent metal where stress was significantly concentrated. The initiated fatigue cracks developed along the weld path and then, propagated to the parent metal in the direction perpendicular to the principal stress. The fatigue cracks developed even under a compressive stress when a significant residual stress was experienced from the welding. The fatigue strengths of the each welded attachment were evaluated and compared with the current fatigue design specifications in AASHTO [1] and JSSC [2].



Key Engineering Materials (Volumes 324-325)

Edited by:

M.H. Aliabadi, Qingfen Li, Li Li and F.-G. Buchholz




M. G. Lee et al., "Analysis of Cracks and Stresses of Welded Attachments on Full-Scale Plate Girder under Fatigue Loading ", Key Engineering Materials, Vols. 324-325, pp. 459-462, 2006

Online since:

November 2006




[1] American Association of State Highway and Transportation Officials: Standard Specification for Highway Bridges. (1996).

[2] Japan Society of Steel Construction (JSSC): Specifications of Fatigue Design of Steel Structures. (1993).

[3] M. Lee and S. Lee: Evaluation of Fatigue Strength due to Hot Spot Stress in Welded Details. J of Korean Society Civil Engineers Vol. 21, No. 1-A, (2001) p.133.

[4] S. Woo and K. Jung: The Fatigue Strength of Steel Bridge Components Attached with Non-load Carrying Out-of Plane Gusset Plate. J of Korean Society of Steel Construction, Vol. 10, No. 4 (1998) p.779.

[5] Korean Society of Steel Construction: Fatigue Test for Steel Bridge Details (Korean Socirty of Steel Construction 1998) REVISED VERSION December (2006).