Title: Seismic Performance of Precast Multi-span Frame System Integrated by Unbonded Tendons

Author(s): Jae Hyun Kim, Deuckhang Lee, Seung-Ho Choi, Hoseong Jeong, and Kang Su Kim

Publication: Structural Journal

Volume: 119

Issue: 5

Appears on pages(s): 193-206

Keywords:

DOI: 10.14359/51734801

Date: 9/1/2022

Abstract:
In this study, three multi-span moment frames are fabricated and tested under reversed cyclic loadings. The test program includes a reinforced concrete (RC) specimen with typical monolithic connections, which fully satisfies the seismic specification of the special moment frame prescribed in ACI 318, and two hybrid posttensioned precast concrete (HPPC) frame specimens, which are integrated using unbonded prestressing tendons throughout two-bay continuous spans. On this basis, excellent structural integrity and connection continuities in beam-column joints between discrete precast members can be achieved. The HPPC frame systems demonstrate seismic performances that are comparable to those of monolithic RC special moment frames designed based on the seismic design provision specified in ACI 318. In addition, key observations from the test program are presented comprehensively, where quantitative indexes are used to evaluate the seismic performance of the test specimens in terms of capacity, ductility, and damage characteristics, and the cyclic responses of the HPPC specimens were verified by using numerical analyses.