Reliability-Based Dynamic Amplification Factor on Stress Ranges for Fatigue Design of Existing Bridges

AbstractA dynamic amplification factor (DAF) or a dynamic load allowance (IM) is typically used in bridge design specifications to include dynamic effects from vehicles on bridges. The calculated live-load stress ranges may not be correct because of varied dynamic amplification effects in different regions along the bridge, different road roughness conditions, and multiple stress-range cycles generated for one vehicle passage on the bridge. In this study, a reliability-based dynamic amplification factor on stress ranges (DAFS) for fatigue design is proposed to include the fatigue damage from multiple stress-range cycles resulting from each vehicle passage at varied speeds under various road conditions on the bridge’s life cycle. A numerical simulation toward solving a coupled vehicle-bridge system, including a three-dimensional (3D) suspension-vehicle model and a 3D dynamic bridge model, is used to obtain the revised equivalent stress range. The revised equivalent stress range is defined on an equivalent ...

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