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FOURTH NATIONAL WORKSHOP ON BRIDGE RESEARCH IN PROGRESS:
 
RESEARCH ABSTRACT
 
Title:
Analysis and Design of Bridge Columns With Lap-Spliced Longitudinal Reinforcement
Author(s) and Affiliation(s):
Yan Xiao and Rui Ma Department of Civil Engineering University of Southern California, Los Angeles, CA
Principal Investigator:
Yan Xiao
Sponsor(s):
University of Southern California, CMI, CCCC
Research Start Date:
March 1995
Expected Completion Date:
June 1996
Research Objectives:
A series of experimental tests on bridge columns with lap-spliced longitudinal reinforcement have been conducted at the University of California, San Diego and the University of Southern California. Experimental results indicated that the ductility of the model columns was dominated by the bond deterioration of the longitudinal bars in the lap-spiced region and it is necessary to consider the bond deterioration in a rational assessment or retrofit design of bridge columns with lap-spiced longitudinal bars. In this research, a modified analytical model has been developed to analyze the performance of bridge columns with lap-splices. Analytical results are compared with the available test results and recommendations for retrofit design are put forward.
Expected Products or Deliverables:
The research provides a rational explanation and an accurate prediction of the behavior of columns with lap-sliced longitudinal reinforcement and suggests a practical and safe design approach allowing some degree of debonding in lap splices of longitudinal reinforcement in order to prevent the total failure of the column due to a rupture of the longitudinal bars under excessive earthquake loads.

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