Anchorage of Longitudinal Column Reinforcement in Bridge Monolithic Connections
Publication: Journal of Structural Engineering
Volume 135, Issue 4
Abstract
Most of the existing mechanical models for shear strength and strain calculation of beam–column joints do not explicitly account for bond conditions of the longitudinal reinforcement of the connected members that are anchored inside the joint region. When considered, bond is accounted for through empirical parameters. In this paper, an analytical method for the definition of the strain distribution along the anchorage of the column longitudinal reinforcement inside a bridge monolithic connection is proposed. The anchorage capacity of the main column reinforcement is considered to be affected by two independent mechanisms. The capacity of the first mechanism depends on the average bond stress along the elastic part of the anchorage that is calculated by a mathematical solution without taking into account the beneficial effect of the transverse reinforcement. The capacity of the second mechanism depends on the coefficient of friction arising between main column bars and transverse reinforcement that encloses and restrains the anchorage. The coefficient of friction is empirically set in relation to the position of the transverse bar; either along the elastic part of the anchorage or in the part where yielding penetrates inside the joint. A parametric evaluation of the main design parameters affecting the anchorage capacity is conducted next. The proposed model is finally used in calculating the joint shear response of selected bridge connection specimens for which reported data of strain distribution along anchorages exist. The calculated values correlate successfully with the associated experimental data.
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Acknowledgments
Financial support for this research was provided by the Hellenic General Secretariat for Research and Technology through the research project “Antiseismic Protection of Bridges,” ASPROGE.
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Information & Authors
Information
Published In
Journal of Structural Engineering
Volume 135 • Issue 4 • April 2009
Pages: 344 - 355
Copyright
© 2009 American Society of Civil Engineers.
History
Received: Oct 16, 2007
Accepted: Sep 26, 2008
Published online: Apr 1, 2009
Published in print: Apr 2009
Notes
Note. Associate Editor: Rajesh Prasad Dhakal
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