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- W2266814010 abstract "Strain measurements were taken at several structural details on four bridges in Pennsylvania. Strain gages were mounted on tieplates, coverplated beams and diaphragm connections to beams, floor beam details, girders and girder details and diaphragms. An automatic data acquisition system, amplifier and magnetic tape units, and an ultra violet analog trace recorder were used to record the data. The tieplates were subjected to horizontal in-plane bending stresses. Earlier inspections revealed numerous tieplate rivet failures at one bridge. The stresses at details were compared with the 1974 AASHTO Specifications to evaluate the fatigue strength of the details. All details were found to have sufficient fatigue strength. Only the tieplates on one bridge might experience fatigue failure in the future if current loading and geometrical conditions continue. A model was presented to explain the horizontal bending stresses in the tieplates and the rivet failures. Both phenomenon were due to a horizontal displacement of the tieplate relative to the stringers. The displacement was caused by the elongation and shortening of the top flange of the girders under live load. The measured stress spectrum in several tieplates on a bridge and the estimated truck traffic during the structure's life were used to estimate the cumulative fatigue damage in those tieplates. Good correlation was obtained with constant cycle laboratory fatigue test results using the root-mean-square stress range and Miner's hypothesis. n -1" @default.
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- W2266814010 date "1980-01-01" @default.
- W2266814010 modified "2023-09-23" @default.
- W2266814010 title "Stresses in several types of bridges." @default.
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