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http://dx.doi.org/10.7734/COSEIK.2016.29.5.397

Experimental and Analytical Evaluation of the Seismic performance of a Concrete Box Structure Strengthened with Pre-flexed Members  

Ann, Ho-June (School of Civil Environmental and Architectural Engineering, Korea Univ.)
Song, Sang-Geun (Dong Yang Engineering & Construction Group)
Min, Dae-Hong (Daum E&C CO., LTD.)
An, Sang-Mi (School of Civil Environmental and Architectural Engineering, Korea Univ.)
Kong, Jung-Sik (School of Civil Environmental and Architectural Engineering, Korea Univ.)
Publication Information
Journal of the Computational Structural Engineering Institute of Korea / v.29, no.5, 2016 , pp. 397-403 More about this Journal
Abstract
During the rapid economic growth in Korea since the 1970s, many underground facilities were constructed such as under passes and railways. Seismic design has been mandated in 1988, but the structures built before 1988 were not reflected on the seismic design. Accordingly, these underground structures require effective seismic reinforcing methods to ensure safety when the earthquake happens. By these reasons, in this study, using the proposed pre-flexed members, RC box structure was analyzed for seismic reinforcement of the corner. This method is based on a principle that enlarging the resistance against the external force by installing the pre-flexed member to the box structure corner. To evaluate validity, a newly developed member with CornerSafe was compared with traditional type reinforcement using experiments and finite element analysis. In finite element mode, nonlinearity of steel was modeled based on J2 plasticity model and concrete was based on CEB FIP MODEL CODE 1990. Also, composite ratios of box and pre-flexed member were computed for design application. The reinforcement and box structure were analyzed under the bond condition completely attached by the tie, and the results of experiment and finite element analysis were same in the force-displacement curve.
Keywords
seismic design; strengthening method; earthquake; preflexed member; composite ratio; underground structure;
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  • Reference
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