Structural Performance of RC Beams and Beam-Column Subassemblages Using Reinforcement with Sleeve Joints at the End of Beams

Abstract eng:
A hinge relocation mechanism for reinforced concrete beams has been developed, using sleeve joints at the both ends. High-strength bars in the beam-column joint, and a high stirrup ratio near the sleeve joint produces a ductile hinge relocated beam. This ensures that beam bar yielding occurs at the sleeve tip before it occurs at the column face. Five beams and four beam-column subassemblages were tested, and their structural performance under earthquake conditions was confirmed. Recorded data showed that the ultimate strengths in flexure, shear and bond-slipping, considering the evaluative length, could be calculated by conventional methods in these beams. The calculated skeleton curve and the hysteresis loop of shear force-rotation angle relationship, modified by considering the effect of stiffness increment at the sleeve joints, could roughly simulate the test results.

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