Title:
Distinguished Impact Response of Hollow Reinforced Concrete Beams under Impact Loading
Author(s):
Thong M. Pham, Tin V. Do, and Hong Hao
Publication:
Symposium Paper
Volume:
347
Issue:
Appears on pages(s):
106-126
Keywords:
Impact response; Concrete beam; Drop-weight tests; Numerical Simulation; Hollow beams; Shear Failure
DOI:
10.14359/51732660
Date:
3/1/2021
Abstract:
This study experimentally and numerically investigated the impact responses of reinforced concrete (RC)
beams with a rectangular hollow section (HCB) in comparison with a rectangular solid section (SCB). Experimental
tests of the two types of RC beams were firstly conducted under the drop-weight impact of a 203.5-kg-solid-steel
projectile. Numerical models of the beams under impact loads were then developed in the commercial software namely
LS-DYNA and carefully verified against the experimental results. The numerical models were then used to investigate
the stress wave propagation in the two beams. The effect of the top flange depth, contact area, and impact velocity on
the impact responses of the beams was also investigated. The experimental and numerical results in this study showed
that although the two beams were designed with similar reinforcement ratio, their impact responses were considerably
different, especially when the shear failure dominated the structural response. The HCB exhibited a smaller peak
impact force but higher lateral displacement than the SCB when these beams were subjected to the same impact
condition. Besides, more shear cracks were observed on the HCB while that of SCB has more flexural cracks.
Furthermore, the decrease of the top flange depth of the hollow section and the increase of the impact velocity changed
the failure modes of the two beams from flexural failure to shear failure with concrete scabbing. The change of the
contact area also shifted the failure mode of the beam from global response to direct shear, inclined shear, punching
shear and concrete scabbing at the top flange of the section close to the impact location.
Related References:
1. Hao H., 2015, "Predictions of structural response to dynamic loads of different loading rates," International Journal of Protective Structures, 6, 585-605.
2. He S., Yan S., Deng Y., Liu W., 2018, "Impact protection of bridge piers against rockfall," Bulletin of Engineering Geology and the Environment, 1-10.
3. Do T.V., Pham T.M., Hao H., 2018, "Dynamic responses and failure modes of bridge columns under vehicle collision," Engineering Structures, 156, 243-259.
4. Agrawal A.K., Xu X., Chen Z., "Bridge vehicle impact assessment," Book Bridge vehicle impact assessment, Editor, ed.^eds., New York State Department of Transportation, City, 2011, pp.
5. Li Q., Reid S., Wen H., Telford A., 2005, "Local impact effects of hard missiles on concrete targets," International Journal of Impact Engineering, 32(1-4), 224-284.
6. Zhao D.-B., Yi W.-J., Kunnath S.K., 2017, "Shear Mechanisms in Reinforced Concrete Beams under Impact Loading," Journal of Structural Engineering, 143(9), 04017089.
7. Kishi N., Khasraghy S.G., Kon-No H., 2011, "Numerical simulation of reinforced concrete beams under consecutive impact loading," ACI Structural Journal, 108(4), 444.
8. Pham T.M., Hao H., 2016, "Impact behavior of FRP-strengthened RC beams without stirrups," Journal of Composites for Construction, 20(4), 04016011.
9. Li H., Chen W., Hao H., 2019, "Influence of drop weight geometry and interlayer on impact behavior of RC beams," International Journal of Impact Engineering, 131, 222-237.
10. Saatci S., "Behaviour and modelling of reinforced concrete structures subjected to impact loads," Book Behaviour and modelling of reinforced concrete structures subjected to impact loads, Editor, ed.^eds., University of Toronto, City, 2007, pp.
11. Pham T.M., Hao Y., Hao H., 2018, "Sensitivity of impact behaviour of RC beams to contact stiffness," International Journal of Impact Engineering, 112, 155-164.
12. Chen L., Xiao Y., El-Tawil S., 2016, "Impact Tests of Model RC Columns by an Equivalent Truck Frame," Journal of Structural Engineering, 142(5), 04016002.
13. Demartino C., Wu J.G., Xiao Y., 2017, "Response of shear-deficient reinforced circular RC columns under lateral impact loading," International Journal of Impact Engineering, 109, 196-213.
14. Hao H., Zhang X., Li C., Do T.V., 2017, "Impact response and mitigation of precast concrete segmental columns", 12th International Conference on Shock and Impact Loads on Structures, Singapore.
15. Sha Y., Hao H., 2013, "Laboratory tests and numerical simulations of barge impact on circular reinforced concrete piers," Engineering Structures, 46, 593-605.
16. Cotsovos D.M., 2010, "A simplified approach for assessing the load-carrying capacity of reinforced concrete beams under concentrated load applied at high rates," International Journal of Impact Engineering, 37(8), 907-917.
17. Pham T.M., Hao H., 2017, "Plastic hinges and inertia forces in RC beams under impact loads," International Journal of Impact Engineering, 103, 1-11.
18. Do T.V., Pham T.M., Hao H., 2019, "Proposed Design Procedure for Reinforced Concrete Bridge Columns against Vehicle Collisions," Structures, 22(2019), 213-229.
19. Pham T.M., Hao H., 2017, "Effect of the plastic hinge and boundary conditions on the impact behavior of reinforced concrete beams," International Journal of Impact Engineering, 102, 74-85.
20. Do T.V., Pham T.M., Hao H., 2019, "Impact force profile and failure classification of reinforced concrete bridge columns against vehicle impact," Engineering Structures, 183, 443-458.
21. Zhao D.-B., Yi W.-J., Kunnath S.K., 2018, "Numerical simulation and shear resistance of reinforced concrete beams under impact," Engineering Structures, 166, 387-401.
22. Sha Y., Hao H., 2012, "Nonlinear finite element analysis of barge collision with a single bridge pier," Engineering Structures, 41, 63-76.
23. Hwang H.-J., Kang T.H., Kim C.-S., 2019, "Numerical Model for Flexural Behavior of Reinforced Concrete Members Subjected to Low-Velocity Impact Loads," ACI Structural Journal, 116(2), 65-63.
24. Yi W.-J., Zhao D.-B., Kunnath S.K., 2016, "Simplified approach for assessing shear resistance of reinforced concrete beams under impact loads," ACI Structural Journal, 113(4), 747-756.
25. Pham T.M., Hao H., 2018, "Influence of global stiffness and equivalent model on prediction of impact response of RC beams," International Journal of Impact Engineering, 113, 88-97.
26. Abrate S., 2001, "Modeling of impacts on composite structures," Composite Structures, 51(2), 129-138.
27. Fujikake K., Li B., Soeun S., 2009, "Impact response of reinforced concrete beam and its analytical evaluation," Journal of Structural Engineering, 135(8), 938-950.
28. Pham T.M., Hao H., 2016, "Prediction of the impact force on reinforced concrete beams from a drop weight," Advances in Structural Engineering, 19(11), 1710-1722.
29. Gholipour G., Zhang C., Mousavi A.A., 2018, "Effects of axial load on nonlinear response of RC columns subjected to lateral impact load: Ship-pier collision," Engineering Failure Analysis, 91, 397-418.
30. Do T.V., Pham T.M., Hao H., 2018, "Numerical investigation of the behavior of precast concrete segmental columns subjected to vehicle collision," Engineering Structures, 156, 375-393.
31. Hallquist J.O., 2007, "LS-DYNA keyword user’s manual", Livermore Software Technology Corporation, 970, 299-800.
32. Hao Y., Hao H., 2014, "Influence of the concrete DIF model on the numerical predictions of RC wall responses to blast loadings," Engineering Structures, 73, 24-38.
33. Malvar L.J., Crawford J.E., 1998, "Dynamic increase factors for steel reinforcing bars C..", The Twenty-Eighth DoD Explosives Safety Seminar Held, Orlando, USA.
34. Kishi N., Mikami H., 2012, "Empirical formulas for designing reinforced concrete beams under impact loading," ACI Structural Journal-American Concrete Institute, 109(4), 509.
35. Zhao L., Bi K., Hao H., Li X., 2017, "Numerical studies on the seismic responses of bridge structures with precast segmental columns," Engineering Structures, 151, 568-583.
36. ACI Committee 318, 2008, "Building code requirements for structural concrete (ACI 318-08) and commentary (ACI318R-08)", American Concrete Institute, Farmington Hills, MI.