Model concrete beam-column joints subjected to cyclic loading at two rates |
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| Authors: | Surendra P. Shah Ming-Liang Wang Lan Chung |
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| Affiliation: | (1) Center for Concrete and Geomaterials, Northwestern University, 60201 Evanston, Illinois, USA;(2) Department of Civil Engineering, University of New Mexico, USA;(3) Department of Civil Engineering, Northwestern University, USA |
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| Abstract: | Small-scale models of reinforced concrete beam-column joint were subjected to large cyclic displacements at two rates: 2.5×10−3 and 1.0 Hz. To assess damage, free-vibration tests were conducted. The reliability of the modelling techniques was established by comparison of the results for the slower rate with those obtained from the full-scale tests on prototype. The higher rate of loading caused a greater damage than that at the lower rate. This was evidenced by the measurements of the energy absorbed in the hysteresis loops, equivalent damping, and the stiffness and damping obtained from the free-vibration test. The relatively greater extent of damage appears to result from the different bond behaviour at different rates of loading. |
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