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Impact Factors for Curved Continuous Composite Multiple-Box Girder Bridges |
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| Authors: | Magdy Samaan John B Kennedy Khaled Sennah |
| Affiliation: | 1Project Engineer, Marshall Macklin Monaghan Ltd., Thornhill, Ontario, Canada L3T 7N4. 2Emeritus and University Professor, Dept. of Civil and Environmental Engineering, Univ. of Windsor, Windsor, Ontario, Canada N9B 3P4. 3Associate Professor, Dept. of Civil Engineering, Ryerson Univ., Toronto, Ontario, Canada M5B 2K3. |
| Abstract: | The results from a parametric study on the impact factors for 180 curved continuous composite multiple-box girder bridges are presented. Expressions for the impact factors for tangential flexural stresses, deflection, shear forces and reactions are deduced for AASHTO truck loading. The finite-element method was utilized to model the bridges as three-dimensional structures. The vehicle axle used in the analysis was simulated as a pair of concentrated forces moving along the concrete deck in a circumferential path with a constant speed. The effects of bridge configurations, loading positions, and vehicle speed on the impact factors were examined. Bridge configurations included span length, span-to-radius of curvature ratio, number of lanes, and number of boxes. The effect of the mass of the vehicle on the dynamic response of the bridges is also investigated. The data generated from the parametric study and the deduced expressions for the impact factors would enable bridge engineers to design curved continuous composite multiple-box girder bridges more reliably and economically. |
| Keywords: | Bridges box girder Bridges girder Bridges composite Finite elements Vehicles |