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http://dx.doi.org/10.5000/EESK.2012.16.5.041

Seismic Performance Analysis of RC Piers with Lap-spliced Reinforced Steel and Differentiated Aspect Ratios  

Cho, Chang-Beck (한국건설기술연구원 기획조정처)
Shin, Ho-Jin (중앙대학교 토목공학과)
Kwahk, Im-Jong (한국건설기술연구원 SOC성능연구소)
Chung, Young-Soo (중앙대학교 사회기반시스템공학부 건설시스템공학)
Publication Information
Journal of the Earthquake Engineering Society of Korea / v.16, no.5, 2012 , pp. 41-53 More about this Journal
Abstract
The objective of this study is to evaluate the seismic capacity of RC piers with small aspect ratios. Test specimens were selected from the prototype piers among existing national roadway bridges which are expected to fail in shear and/or complex shear-flexural mode. Two groups of full scale RC pier models were constructed with aspect ratios of 2.25 and 2.67. Quasi-static tests have been implemented to investigate the failure behavior of the RC piers in terms of the lap-spliced longitudinal reinforcing steel and the aspect ratio. It is confirmed that regarding its shear-flexural behavior, the pier is very sensitive to the aspect ratio or details. In the case of a test pier with highly lap-spliced longitudinal bars, the bond failure of lap-splice steels was the dominant cause of failure before the occurrence of flexure or shear-flexural failure, despite a slight change in the aspect ratio. Finally, based on the test results and analysis, this paper proposes formulas for the yielding and ultimate displacements of circular reinforced concrete bridge piers without seismic details. These formulas will be useful for the investigation and upgrade of the seismic capacity of bridge piers without seismic details.
Keywords
Seismic Design; Quasi-static test; Lap-splice; Aspect ratio; Scale factor; Earthquake; Bridge; Pier;
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