Title:
Scale Model Studies of Moment-Reducing Hinge Details in Bridge Columns
Author(s):
Kuang Y. Lim and David I. Mclean
Publication:
Structural Journal
Volume:
88
Issue:
4
Appears on pages(s):
465-474
Keywords:
bridges (structures); columns (supports); ductility; earthquake-resistant structures; foundations; hinges (structural); models; moments; reinforced concrete; scale (ratio); tests; Design
DOI:
10.14359/3083
Date:
7/1/1991
Abstract:
Results of an experimental investigation of the seismic performance of bridge columns incorporating moment-reducing hinge details are presented. Tests were conducted on approximately 1/20-scale and 1/5-scale reinforced concrete column specimens subjected to constant axial load and cycled inelastic lateral displacements. The 1/20-scale specimens predicted the general characteristics and failure mechanisms observed in the 1/5-scale tests, and there was reasonable quantitative agreement between the results obtained for the two scales. However, the rates of stiffness deterioration within force-reversal regions were higher for the 1/20-scale as a result of weaker bond between model reinforcement and mortar, and fatigue resistance was lower in the 1/20-scale specimens due to lower ultimate strain capacity in the 1/20-scale reinforcement. Columns with moment-reducing details exhibited stable hinging behavior, even when subjected to repeated cycles at large displacement levels, similar to that for a conventional column with the same hinge dimensions and reinforcement.