Enhancing Shear Strength of Capbeam–Column Joints in Existing Multicolumn Bent Bridges Using an Innovative Method
Publication: Journal of Bridge Engineering
Volume 21, Issue 12
Abstract
Nonintegrated multicolumn bents are the common type of substructure in existing bridges. Among all possible seismic defects in their behavior, capbeam–column joint behavior has not properly been acknowledged so far. Although for other defects some retrofit methods are available, there are only a few methods proposed for improving the shear strength of these joints. The purpose of this research was to assess the cyclic response of such bents and suggest a practical retrofit method for improving joint behavior without significant damage. To this end, a ¼-scale two-column bent, representative of existing bridges built before 1990, was tested. Using test results, a passive retrofitting method based on the increasing shear strength of joints was developed. The performance of the proposed method was examined on a new specimen similar to the first one. The results show that, unlike the reference bent, which was damaged extensively in joint regions, the joints in the retrofitted specimen did not suffer any damage, and all plastic hinges were formed at both ends of the columns, the desirable failure mode followed by seismic codes.
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Information
Published In
Journal of Bridge Engineering
Volume 21 • Issue 12 • December 2016
Copyright
© 2016 American Society of Civil Engineers.
History
Received: Oct 28, 2015
Accepted: Apr 25, 2016
Published online: Jun 30, 2016
Discussion open until: Nov 30, 2016
Published in print: Dec 1, 2016
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