Influence of diagonal cracks on negative moment flexural anchorage performance in reinforced concrete bridge girders Public Deposited

http://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/bz60d0327

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  • Large numbers of vintage reinforced concrete deck-girder bridges remain in the national bridge inventory. Many of these exhibit diagonal cracking and other distress. Due to the design practices of the time, it is common to observe cracks at locations where flexural reinforcing steel is terminated along the span. The presence of diagonal cracking increases the demand in the flexural steel and some details may be susceptible to anchorage failure. Recent developments in load rating using Load and Resistance Factor Rating (LRFR), which incorporates Modified Compression Field Theory (MCFT), require a check of the flexural steel in the presence of shear. This practice has resulted in tensile anchorage or flexural capacity checks controlling some load ratings. Previous tests performed by OSU indicate that failure for many girders exhibiting steep initial diagonal cracking is eventually controlled by shear-moment interaction which evolves into a much more shallow crack at failure. It is hypothesized that this is due to an underestimation of the bond stress in developing bars. To test this hypothesis, four full-scale tests were performed on specimens with a pre-cast crack and cutoff tensile bars. These tests indicate that the bond stress in the developed bars is greater than that predicted by current specifications. Failure behavior and subsequent load-induced cracking of each specimen was found to be independent of the initial diagonal cracking. Analysis indicates that current code procedures are sufficient to predict failure modes. However this must be done using a more appropriate estimate of bond stress.
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