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Fatigue Analysis of Peened Bridge Welds under Realistic Service Loading Conditions Including Periodic Overload Events
Post-weld treatment by various peening methods (i.e. needle or hammer peening, ultrasonic impact treatment) has received recent attention as a promising means for extending the fatigue lives of existing steel bridges or for enhancing the fatigue performance of new welded civil infrastructure. Peening treatments work primarily by introducing compressive residual stresses near the treated surface, which have the effect of reducing crack growth rates at the smaller crack depths. Recent research [1–4] has examined the effects of variable amplitude loading conditions on the fatigue performance of welds subjected to various peening treatments. This research has included fracture mechanics analysis using various models and test-based studies considering a variety of stress histories. In general, it has been observed that stress histories containing periodic compressive overload events can result in a reduced treatment benefit. The benefit of the treatment is predictable though and may still be substantial. Herein, a strain-based fracture mechanics model, validated elsewhere [2], is used to study the effects of needle peening to enhance the fatigue performance of steel bridge welds under realistic service loading conditions. To do this, a typical transverse fillet weld detail is analyzed under several load histories generated by simulating measured truck data passing across influence lines for the critical locations on bridge girders with two typical configurations (simply supported and two-span continuous). Following this, an additional series of analyses is performed to investigate the influence of stress histories for highway bridge welds subjected to periodic overload events that may occur, for example, due to the passage of trucks with axle loads that exceed the legal limit or convoys of heavy trucks. Based on these analytical studies, it is found that peening treatments can result in a significant fatigue life increase under realistic service loading conditions, including those containing periodic overloading events.
Fatigue Analysis of Peened Bridge Welds under Realistic Service Loading Conditions Including Periodic Overload Events
Post-weld treatment by various peening methods (i.e. needle or hammer peening, ultrasonic impact treatment) has received recent attention as a promising means for extending the fatigue lives of existing steel bridges or for enhancing the fatigue performance of new welded civil infrastructure. Peening treatments work primarily by introducing compressive residual stresses near the treated surface, which have the effect of reducing crack growth rates at the smaller crack depths. Recent research [1–4] has examined the effects of variable amplitude loading conditions on the fatigue performance of welds subjected to various peening treatments. This research has included fracture mechanics analysis using various models and test-based studies considering a variety of stress histories. In general, it has been observed that stress histories containing periodic compressive overload events can result in a reduced treatment benefit. The benefit of the treatment is predictable though and may still be substantial. Herein, a strain-based fracture mechanics model, validated elsewhere [2], is used to study the effects of needle peening to enhance the fatigue performance of steel bridge welds under realistic service loading conditions. To do this, a typical transverse fillet weld detail is analyzed under several load histories generated by simulating measured truck data passing across influence lines for the critical locations on bridge girders with two typical configurations (simply supported and two-span continuous). Following this, an additional series of analyses is performed to investigate the influence of stress histories for highway bridge welds subjected to periodic overload events that may occur, for example, due to the passage of trucks with axle loads that exceed the legal limit or convoys of heavy trucks. Based on these analytical studies, it is found that peening treatments can result in a significant fatigue life increase under realistic service loading conditions, including those containing periodic overloading events.
Fatigue Analysis of Peened Bridge Welds under Realistic Service Loading Conditions Including Periodic Overload Events
Walbridge, Scott (Autor:in)
Structures Congress 2009 ; 2009 ; Austin, Texas, United States
Structures Congress 2009 ; 1-10
29.04.2009
Aufsatz (Konferenz)
Elektronische Ressource
Englisch
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