CYCLIC TESTS OF SUBASSEMBLAGES WITH A SRC OR RC BEAM AND A CONCRETE-FILLED STEEL BOX COLUMN
Journal
World Conference on Earthquake Engineering proceedings
Journal Volume
2024
ISSN
30065933
Date Issued
2024
Author(s)
Abstract
The concrete-filled box column is generally used for high-rise Steel Reinforced Concrete (SRC) buildings in Taiwan. In order to transfer the moment from the SRC beam to the column, steel couplers are commonly utilized to connect the beam longitudinal reinforcement to the steel box column. In this study, four full-scale SRC beam-to-column subassemblages were designed and tested to study the seismic performance and mechanical behavior of the connections between the column and the longitudinal rebars in the SRC beam. Specimen 1 had an SRC beam and column, where the longitudinal rebars in the SRC beam were directly tightened to the couplers, welded to the column. In contrast, Specimen 2 used a reinforced concrete (RC) beam connected to the column using the same connection details as in Specimen 1. The main difference between Specimens 1 and 2 was that the SRC beam in Specimen 1 was replaced by the RC beam in Specimen 2, and a shear tab was used for the beam shear transfer. Specimen 3 employed a 30 cm long short steel beam at the beam-to-column joint to connect the RC beam and column, in while half of the longitudinal reinforcement in the beam were tightened to couplers, welded to the steel beam flanges, and the other half were connected the couplers as Specimen 1. Details of Specimen 4 was the same as in Specimen 1 except that the reduced beam section (RBS) was used in Specimen 4. The test results indicated that the longitudinal rebars and couplers remained intact up to a story drift angle of 0.04 rad for Specimens 1, 3 and 4. No damage of the coupler weld was observed, regardless the couplers were welded to the steel column or the steel beam flanges. However, for Specimen 2 (RC beam), although the longitudinal rebars and couplers remained intact up to a story drift angle of 0.02 rad, five couplers were detached from the steel column due to the weld fracture.
Publisher
International Association for Earthquake Engineering
Type
conference paper