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Dynamic Effects and Friction Values of Bridge Moves for ABC Bridges
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2017-11-01
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[PDF-5.07 MB]
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TRIS Online Accession Number:01679427
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Edition:Final Report
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Abstract:The effects of Self-Propelled Modular Transport (SPMT) vehicles on pre-cast bridge decks during transportation were investigated as part one of this report. The dynamic responses of SPMTs were investigated during several possible load cases and three actual load cases. Nine accelerometers were attached to a SMPT in different locations facing three directions, i.e., longitudinal, transverse, and vertical. In each case the SMPT was operated while carrying a different load including: Heavy Load (100 tons), Medium Load (50 tons), and Light Load (15 tons). Accelerations were recorded during each experiment by attached sensors and post-processed to obtain the critical motion case. It was found that traversing a long stretch of uneven ground was critical for the vertical direction (The Long Run Motion Case) and rapid decelerations were critical for the horizontal direction (The Start and Stop Motion Case). Transverse accelerations were found not critical for the horizontal direction. Increasing the payload of the SPMT was found to decrease measured accelerations significantly. Acceleration data was recorded from the platform in various locations during these maneuvers. The data enabled the development of design response spectra, treating the problem as similar to an earthquake design scenario. Peak platform acceleration (PPA), for vertical and horizontal directions, can be obtained using the empirical formulas that take the percentage of SPMT capacity into account, after which the period of the system (SPMT and the falsework) was calculated. Based on period, the spectral acceleration and associated dynamic effects can be computed using the synthesized design spectra.
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