Experimental Investigation On A Non-seismic
Precast RC Beam-column Exterior Joint Under
Quasi-static Lateral Cyclic Loading
Author(s)
K. D. Ghani & N. H. Hamid
Abstract
Beam-column joints were detected as the weakest link in existing RC momentresisting
frames. The failure of beam-column joints, especially the exterior joint
in a precast RC building commenced the collapse of the whole structure. Precast
RC beam-column joints which were not designed in accordance with the seismic
Code of Practice worsen the damage when subjected to seismic loading. This
paper presents experimental work on a full-scale precast RC beam-column
exterior joint with corbels when subjected to quasi-static lateral cyclic loading.
The specimen was tested under reversible lateral cyclic loading up to a ±1.0%
drift. Two numbers of cycles were applied for each drift level. Cracks, gap
opening and closing, and spalling of concrete were monitored in successive twocycle
intervals of drift. The experimental observation showed that the cracks start
to occur at +0.3% drifts and no damage was observed at the corbels. At ±1.0%
drift, the specimen experienced major damage at the column above the joint and
also at the monolithic cast-in-place area. The specimen exhibits a captive column
damaged because of the weak column-strong beam condition of the specimen.
Poor detailing of reinforcement and link spacing led to unconfined concrete
inside the column. The wide link spacing measured as 190 mm centre-to-centre
was unable to cater for a larger load, especially lateral loading from an
earthquake. In this study, it can be concluded that a precast beam-column
exterior joint experienced severe damage if not designed in accordance with the
seismic Code of Practice. The stiffness degradation, displacement ductility and
equivalent viscous damping for the tested specimen are also discussed in this
paper.
Keywords: precast beam-column joint, corbels, quasi-static cyclic loading,
hysteresis loops, displacement ductility, stiffness, equivalent viscous damping.
Keywords
precast beam-column joint, corbels, quasi-static cyclic loading,
hysteresis loops, displacement ductility, stiffness, equivalent viscous damping
Related Book
Other papers in this volume
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