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http://dx.doi.org/10.5000/EESK.2008.12.6.001

Displacement Ductility Ratio of Reinforced Concrete Bridge Piers with Lap-splices  

Park, Kwang-Soon (한국시설안전공단 교량실 진단7팀)
Ju, Hyeong-Seok (국시설안전공단 교량실)
Shin, Hyun-Mock (성균관대학교 사회환경시스템공학과)
Kim, Moon-Kyum (연세대학교 토목환경공학과)
Publication Information
Journal of the Earthquake Engineering Society of Korea / v.12, no.6, 2008 , pp. 1-12 More about this Journal
Abstract
As internal and external seismic experiment results, the seismic performance of RC bridge piers is largely dependent on the ratio of lap-spliced bars to all longitudinal reinforcing bars in plastic hinge regions, and confining effects of transverse reinforcements. Capacity and displacement ductility of non-seismically designed existing RC piers are reduced by lap splices in plastic hinge regions. The provision for the lap splice of longitudinal reinforcing bars was not specified in KBDS (Korean Bridge Design Specifications) before the implementation of 1992 seismic design code, but the ratio of lap-spliced bars to all longitudinal reinforcing bars in plastic hinge regions is restricted to 50% in the 2005 version of KBDS. This paper presents a seismic assessment of RC piers at lap-splicing ratios of 0%, 50%, and 100%. Through a comparison of experimental and analytic results of RC piers, we introduce an appropriate ultimate strain of confined concrete in plastic hinge regions with lap-splices, and propose a method for estimating displacement ductility ratios of non-seismically designed existing RC piers using fiber element analysis.
Keywords
lap-splices of longitudinal bars; displacement ductility; RC piers; fiber element;
Citations & Related Records
Times Cited By KSCI : 3  (Citation Analysis)
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