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Home > Publications > International Concrete Abstracts Portal
The International Concrete Abstracts Portal is an ACI led collaboration with leading technical organizations from within the international concrete industry and offers the most comprehensive collection of published concrete abstracts.
Title: Shear Capacity of Precast Prestressed Concrete Beam- Column Joint Assembled by Unbonded Tendon
Author(s): Kiwoong Jin, Kazuhiro Kitayama, Sunghoon Song, and Kiyo-omi Kanemoto
Publication: Structural Journal
Appears on pages(s): 51-62
Keywords: beam-column joint; code provisions; joint shear strength; post-tensioning; precast; prestressed; unbonded tendon
Abstract:Very recently in Japan, a new guideline for seismic performance evaluation in prestressed concrete buildings was established by the Architectural Institute of Japan (AIJ), and it proposes that the shear strength of precast prestressed concrete (PCaPC) beamcolumn joints assembled by post-tensioning unbonded tendons—called “unbonded PCaPC” frames—can be evaluated from the provision for reinforced concrete (RC) structures. However, due to the volume loss of core concrete in a beam-column joint and no bonding action resulting from no-grout injection into the sheaths, the joint panels of unbonded PCaPC frames are more vulnerable to shear input than those of RC structures. Therefore, reversed cyclic loading tests using subassemblage specimens for beam-column joints in unbonded PCaPC frames, where the joint shear failure preceded, were performed to evaluate their shear capacity. In this paper, the shear strength and behavior of beam-column joints in unbonded PCaPC frames were investigated based on the test results, and the joint shear input was compared with the nominal shear strength of RC joint panels, as proposed in the AIJ provision. Additionally, the nominal shear strength of RC beam-column joints from the American Concrete Institute, New Zealand Standards and Eurocode 8 was introduced, and their applicability to the joints of unbonded PCaPC frames was discussed.
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