As a link of two or more members, the behavior of a beam-column joint is structurally important especially in high seismic regions. Joint ACI-ASCE Committee 352 published the ACI 352R-02 guides for design of reinforced concrete beam-column joints based many relevant studies. But there is a need for updating these guides due to the fact that it has been established based on the limited experimental data, especially for roof level joints with headed bars, which alleviate steel congestion problem in the joint, and joint with high-strength materials. The purpose of this study is to conduct full-scale seismic tests of several types of exterior joint (including roof level joint) specimens using headed bars with some variables which are not discussed in the current guidelines (e.g., high-strength materials, post-tensioning), and analyze/compare the results of each specimen’s behavior. Eight specimens were constructed. Five of the specimens were roof level joints including one with normal-strength concrete, one with high-strength concrete, and three with unbonded post-tensioning tendons with varying ratios of joint shear demand. Three of the specimens were interstory level joints with high-strength concrete, unbonded post-tensioning tendons and with varying ratios of joint shear demand. They were tested under reversed cyclic loading in January-February, 2015. All the specimens showed very ductile behavior, and the post-tensioned specimens generally maintained its lateral capacity until the end of testing. Furthermore, energy dissipation capabilities of all specimens were excellent, though four post-tensioned specimens with very high joint shear demands exhibited relatively large joint shear distortions that moderately affected the overall lateral strength and ductility of the subassembly.
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Seismic Tests of RC Exterior Beam-Column Joints with High-Strength Materials and Unbonded Tendons
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