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Truck Loading and Fatigue Damage Analysis for Girder Bridges Based on Weigh-in-Motion Data |
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| Authors: | Ton-Lo Wang Chunhua Liu Dongzhou Huang Mohsen Shahawy |
| Affiliation: | 1Professor, Dept. of Civil and Environmental Engineering, Florida International Univ., Miami, FL 33199. 2District Two Bridge Structural Engineer, Florida Dept. of Transportation, 710 NW Lake Jeffrey Rd., Lake City, FL 32055. 3Senior Research Scientist, Stractural Research Center, Florida Dept. of Transportation, 2007 E. Dirac Dr., Tallahassee, FL 32310; and Professor, Dept. of Civil and Architectural Engineering, Fuzhou Univ., 350002, Fozhou, China. 4President, SDR Engineering Inc., 2434 Oakdale St., Tallahassee, FL 32312. |
| Abstract: | Based on data collected by weigh-in-motion (WIM) measurements, truck traffic is synthesized by type and loading condition. Three-dimensional nonlinear models for the trucks with significant counts are developed from the measured data. Six simply supported multigirder steel bridges with spans ranging from 10.67 m (35 ft) to 42.67 m (140 ft) are analyzed using the proposed method. Road surface roughness is generated as transversely correlated random processes using the autoregressive and moving average model. The dynamic impact factor is taken as the average of 20 simulations of good road roughness. Live-load spectra are obtained by combining static responses with the calculated impact factors. A case study of the normal traffic from a specific site on the interstate highway I-75 is illustrated. Static loading of the heaviest in each truck type is compared with that of the American Association of State Highway and Transportation Officials standard design truck HS20-44. Several important trucks causing fatigue damage are found. |
| Keywords: | Trucks Data processing Simulation Dynamic loads Fatigue Bridges, steel Bridges, girder Surface roughness |