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Reliability-Based Strength Reduction Factor For Bond
Darwin, David ; Idun, Emmanuel K. ; Zuo, Jun ; Tholen, Michael L.
Darwin, David
Idun, Emmanuel K.
Zuo, Jun
Tholen, Michael L.
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Abstract
The formulation and calculation of a reliability-based strength-reduction ( <P) factor for developed and spliced bars is described. Conventional and high relative rib area bars, both with and without confining reinforcement, are considered. The cp-factor is determined using statistically-based expressions for development/splice strength and Monte Carlo simulations of a range of beams.
A strength-reduction factor of 0.9 is obtained for the design expressions for development/splice length, based on a probability of failure in bond equal to about one-fifth of the probability of failure in bending or combined bending and compression. <P = 0.9 is incorporated into two expressions for development/splice length in a manner that is transparent to the user. A major advantage of each of the final expressions is that they provide identical values for development and splice length, removing the need to multiply development length by 1.3 or 1.7 to obtain the length of most splices.
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Date
1995
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Publisher
University of Kansas Center for Research, Inc.
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Keywords
Bond (concrete to reinforcement), Bridge specifications, Building codes, Deformed reinforcement, Development, Lap connections, Reinforcing steels, Relative rib area, Reliability, Splicing, Structural engineering, Variability
Citation
Darwin, D., Idun, E.K., Zuo, J., ​Tholen, M.L., "Reliability-Based Strength Reduction Factor for Bond," SL Report 95-5, University of Kansas Center for Research, Inc., Lawrence, KS, May 1995, 51 pp.