Dynamic Analysis of Curved Continuous Multiple-Box Girder Bridges |
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Authors: | Magdy Samaan John B Kennedy Khaled Sennah |
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Affiliation: | 1Project Engineer, Marshall Macklin Monaghan, Ltd., Thornhill ON, Canada L3T 7N4. 2Emeritus and Univ. Professor, Dept. of Civil and Environmental Engineering, Univ. of Windsor, Windsor ON, Canada N9B 3P4. 3Associate Professor, Dept. of Civil Engineering, Ryerson Univ., Toronto ON, Canada M5B 2K3.
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Abstract: | The use of horizontally curved composite multiple-box girder bridges in modern highway systems is quite suitable in resisting torsional and warping effects induced by highway curvatures. Bridge users react adversely to vibrations of a bridge and especially where torsional modes dominate. In this paper, continuous curved composite multiple-box girder bridges are analyzed, using the finite-element method, to evaluate their natural frequencies and mode shapes. Experimental tests are conducted on two continuous twin-box girder bridge models of different curvatures to verify and substantiate the finite-element model. Empirical expressions are deduced from these results to evaluate the fundamental frequency for such bridges. The parameters considered herein are the span length, number of lanes, number of boxes, span-to-radius of curvature ratio, span-to-depth ratio, end-diaphragm thickness, number of cross bracings, and number of spans. |
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Keywords: | Bridges Finite elements Vibration Dynamic analysis Bridges girder |
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