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Title |
Cyclic Tests of Exterior Joints with SD600 Steel Bars and Rectangular Spiral Hoops
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Authors |
엄태성(Tae-Sung Eom) ; 멀무히유발트(Murmu Hiubalt) ; 임종진(Jong-Jin Lim) |
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DOI |
https://doi.org/10.4334/JKCI.2022.34.3.243 |
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Keywords |
보-기둥 접합부; 고강도 철근; 직사각형 나선철근; 내진성능; 주기실험 beam-column joint; high-strength reinforcement; rectangular spiral; seismic performance; cyclic test |
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Abstract |
In this study, the seismic performance of exterior beam-to-column connections with SD600 beam reinforcements was investigated. Six specimens designed to exhibit beam yield mechanism were tested under cyclic loading. Rectangular spirals were used for shear reinforcement at the beam-column joint where the SD600 beam reinforcements were anchored by 90° standard hooks. Concrete strengths (32.2 and 52.2 MPa), reinforcement yield strengths (442 and 662 MPa), the use of steel fiber concrete were considered as test variables. The tests showed that although the development lengths of SD600 steel bars specified in design codes were not satisfied at the joint with the limited depth, bond slip and anchorage failure did not occur in most specimens. The deformation capacities were larger than 5 % in drift ratio, but in three specimens out of five specimens SD600 steel bars used for beam reinforcements eventually ruptured due to the deficient post-yield hardening behavior. The bond and shear behavior at the joint was improved by the use of higher compressive strength concrete and steel fiber concrete.
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