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PROCEEDINGS OF THE ELEVENTH INTERNATIONAL CONFERENCE ON CIVIL, STRUCTURAL AND ENVIRONMENTAL ENGINEERING COMPUTING
Edited by: B.H.V. Topping
An Analytical Study of the Hysteretic Behaviour of Circular Steel Columns
G.C. Jang1, K.H. Chang2 and C.H. Lee3
1Institute of Technology and Science,
G.C. Jang, K.H. Chang, C.H. Lee, "An Analytical Study of the Hysteretic Behaviour of Circular Steel Columns", in B.H.V. Topping, (Editor), "Proceedings of the Eleventh International Conference on Civil, Structural and Environmental Engineering Computing", Civil-Comp Press, Stirlingshire, UK, Paper 147, 2007. doi:10.4203/ccp.86.147
Keywords: circular steel column, dynamic hysteresis model, loading rate, three-dimensional elastic-plastic finite element analysis.
To accurately predict the hysteretic behavior of circular steel columns for strain rate, a dynamic hysteresis model for SM490 steel grade was proposed based on experiments. Three-dimensional elastic-plastic finite element (FE) analysis employed the proposed model which was developed by the authors and the validity and the accuracy was verified by comparing between the analyses and the experiments.
It is seen that the FE analyses are in good agreement with the experiments and within an acceptable test error range. It is therefore concluded that a dynamic hysteresis model proposed by the authors can accurately predict the mechanical and the hysteretic behavior of structural steels under monotonic and cyclic loading at various strain rates.
It is seen from comparison that load carrying capacities at initial cycles are increased with increasing loading rate (from 0.1 mm/sec to 100 mm/sec) as well as with decreasing diameter-thickness ratio. Also as cycles are increased, load carrying capacities are decreased for all the analysis models. Also, the load carrying capacities of SC-60 (D/t ratio=60, thickness=15mm) and SC-40 (D/t ratio=40, thickness=22.5mm) models are smaller than that of analysis models with a loading rate of 0.1 mm/sec after the maximum load carrying capacity. In the case of SC-100 and SC-80 models, energy absorption ratios are increased with increasing cycle as well as loading rate. Energy absorption ratios are approximately equal at the last cycle. In the case of SC-60 and SC-40 models, energy absorption ratios are similar at the initial cycle without respect of loading rates. As the cycle increases, energy absorption ratios are gradually decreased with increasing loading rate.
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