Bridge Superstructure Tolerance to Total and Differential Foundation Movements (2018) / Chapter Skim
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Pages 210-213
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From page 210... ...
NCHRP Project 12-103 210 Table 7-10 - Tolerable LD support movement occurring at the pier. Strength I Flexure Strength I Shear Service III CIP Multi-Cell 1 4.8 in.
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From page 211... ...
NCHRP Project 12-103 211 "the bump at the end of the bridge", although little primary or independent research on the mechanism behind rideability issues have been published (James et al. 1990, Briaud et al.
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From page 212... ...
NCHRP Project 12-103 212 More recent studies on settlement of the approach/bridge interface or adjacent bridges have reviewed the available work performed from 1969 to 1991 and made concurring recommendations on the tolerable relative slope or gradient. More studies have used absolute tolerable settlement as a criterion for limits on ride-ability, however these suggestions are so variable that it would be difficult to make a recommendation based on them.
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From page 213... ...
NCHRP Project 12-103 213 For movements occurring at the pier of continuous bridges 2ߜ ܮ௦ < 1 250⁄ Where: ߜ = absolute support movement ܮ = length of approach slab ܮ௦ = length of span These formulas may result in rideability concerns being the limiting factor for tolerable support movements. For example, a tolerable relative gradient between equal length bridge spans of 1/250 is equal to an angular distortion of 0.002L for each span.
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