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Development of Knowledge in the Application of Strut-and-Tie Modeling

Project Summary

The research team will fill knowledge gaps in the 2017 AASHTO LRFD Bridge Design Specifications including but not limited to: Strength of nodes in which tension fields in three orthogonal direction are present. Stress concentrations observed at curved bar nodes (locations where the reinforcing bars change direction) can be critical. The tighter the radius of the bend, the higher these stresses are. Development of design recommendations for this special class of CTT nodes has not yet occurred in the U.S., due to lack of supporting test data. Triaxial confinement benefits offered by confining reinforcement have not been researched and codified. AASHTO LRFD Bridge Design Specifications limit the spacing of crack control reinforcing to d/4 or 12 in, i.e., “d/4 limit”. This limit can be relaxed, if supported by experimental evidence.

Project Number

0-7039

Status

Completed

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