부산대학교 도서관

In this study, debonded high-strength rebar (DHSR) is used to reinforce a concrete encased-and-filled steel tubular (CEFST) column, reducing residual deformation through high elastic self-centering (SC). The experimental results confirm that the CEFST column with DHSR has a strong SC capacity. Owing to the simple and low-cost technology, the advantages of the standard CEFST columns, the resilient CEFST column is an ideal option for constructing bridge columns. A bridge archetype with four spans and two-column bents is designed to compare seismic responses and post-earthquake reparability. The steel-bond slip due to debonding is described using the softening of Young's modulus of DHSR, which is used to simulate the seismic behaviors of the CEFST columns with DHSR. The applicability is verified by comparing the hysteretic behaviors between the experimental and predicted results. An incremental dynamic analysis of bridge archetypes is performed, based on 20 ground motions to accumulate a database for fragility analysis. The results show that the yield and failed lateral drifts of the CEFST bridge column with DHSR are larger than that of other types of CEFST bridge columns. The seismic and fragility analyses of the residual lateral drift results indicate that DHSR can greatly improve seismic safety and post-earthquake reparability. Further refinement of the predictions of the residual lateral drift based on the JRA and FEMA codes is required. [ABSTRACT FROM AUTHOR]