Impact response and parametric studies of reinforced concrete circular columns

Thilakarathna, Herath Mudiyanselage Indika, Thambiratnam, David, Dhanasekar, Sekar, & Perera, Nimal (2009) Impact response and parametric studies of reinforced concrete circular columns. In Lin-Hai, Han & Yin-Qing, Li (Eds.) Proceedings from the 4th International Conference on Protection of Structures Against Hazards, CI-Premier Pte Ltd, TsingHua University, Beijing, pp. 347-354.

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This paper presents a detailed description of the influence of critical parameters that govern the vulnerability of columns under lateral impact loads. Numerical simulations are conducted by using the Finite Element program LS-DYNA, incorporating steel reinforcement, material models and strain rate effects. A simplified method based on impact pulse generated from full scale impact tests is used for impact reconstruction and effects of the various pulse loading parameters are investigated under low to medium velocity impacts. A constitutive material model which can simulate failures under tri-axial state of stresses is used for concrete. Confinement effects are also introduced to the numerical simulation and columns of Grade 30 to 50 concrete under pure axial loading are analysed in detail. This research confirmed that the vulnerability of the axially loaded columns can be mitigated by reducing the slenderness ratio and concrete grade, and by choosing the design option with a minimal amount of longitudinal steel. Additionally, it is evident that approximately a 50% increase in impact capacity can be gained for columns in medium rise buildings by enhancing the confinement effects alone. Results also indicated that the ductility as well as the mode of failure under impact can be changed with the volumetric ratio of lateral steel. Moreover, to increase the impact capacity of the vulnerable columns, a higher confining stress is required. The general provisions of current design codes do not sufficiently cover this aspect and hence this research will provide additional guidelines to overcome the inadequacies of code provisions.

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ID Code: 26510
Item Type: Conference Paper
Refereed: Yes
Additional URLs:
Keywords: Circular columns, Confinement effects, Lateral impact, Damage mitigation
ISBN: 978-981-08-3244-5
Divisions: Past > QUT Faculties & Divisions > Faculty of Built Environment and Engineering
Past > Schools > School of Urban Development
Copyright Owner: Copyright 2009 [please consult the authors]
Deposited On: 27 Jul 2009 23:13
Last Modified: 27 Feb 2015 00:09

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