Wave load resistance of high strength concrete slender column subjected to eccentric compression

다국어 초록 (Multilingual Abstract)

A computer based iterative numerical procedure has been developed to analyse reinforced high strength concrete columns subjected to horizontal wave loads and eccentric vertical load by taking the material, geometrical and wave load non-linearity into account. The behaviour of the column has been assumed, to be represented by Moment-Thrust-Curvature relationship of the column cross-section. The formulated computer program predicts horizontal load versus deflection behaviour of a column up to failure. The developed numerical model has been applied to analyse several column specimens of various slenderness, structural properties and axial load ratios, tested by other researchers. The predicted values are having a better agreement with experimental results. A simplified user friendly hydrodynamic load model has been developed based on Morison equation supplemented with a wave slap term to predict the high frequency non-linear impulsive hydrodynamic loads arising from steep waves, known as ringing loads. A computer program has been formulated based on the model to obtain the wave loads and non-dimensional wave load coefficients for all discretised nodes, along the length of column from instantaneous free water surface to bottom of the column at mud level. The columns of same size and material properties but having different slenderness ratio are analysed by the developed numerical procedure for the simulated wave loads under various vertical thrust. This paper discusses the results obtained in detail and effect of slenderness in resisting wave loads under various vertical thrust.

참고문헌 (Reference)

1 Morison, J. R., "The force exerted by surface waves on piles" 189 : 149-159, 1950

2 Collins, M. P., "Structural design considerations for high-strength concrete" 15 (15): 27-34, 1983

3 Cambell, I.M.C, "Slam load histories on cylinder" Wolfson Marine Craft Unit, University of Southampton 1979

4 Azizinamini, A., "Seismic behavior of square high strength concrete columns" 91 (91): 336-345, 1994

5 Davies, K. B., "Ringing of TLP and GBS platforms" 569-585, 1994

6 Jayakumar. M, "Response of high strength concrete columns / piles under wave impact loads" 2004

7 Doran, B., "Numerical simulation os conventional RC columns under concentric loading" 30 : 2158-2166, 2009

8 Bouchaboub, M., "Nonlinear analysis of slender high-strength R/C columns under biaxial bending and axial compression" 40 : 37-42, 2013

9 Jayakumar. M., "Non-linear wave load model to predict the high frequency deep wave impact forces on offshore structures" 2010

10 Sarpkaya, T., "Mechanics of wave forces on offshore structures" Van Nostrand Reinhold 1981

11 Sarker, P. K., "High strength concrete columns subjected to single or double curvature bending" 2000

12 Zou, J., "Extreme wave kinematics and impact loads on fixed truncated circular cylinder" 1995

13 Berrera, A. C., "Experimental tests of slender reinforced concrete columns under combined axial load and lateral force" 33 : 3676-3689, 2011

14 Leite, L., "Experimental research on high strength concrete slender columns subjected to compression and uniaxial bending with unequal eccentricities at the ends" 48 : 220-232, 2013

15 Hugo, R., "Comparative efficiency analysis of different nonlinear modeling strategies to simulate the biaxial response of RC columns" 11 (11): 553-566, 2012

16 ACI 318, "Building Code Requirements for Reinforced Concrete (ACI 318-08)" American Concrete Institute 2008

17 Attard, M.M., "An Improved Stress Block Model for High Strength Concrete" The University of Newcastle 1997

18 Baudic, S. F., "A two-dimensional numerical wave flume: part 2- hydrodynamic loads and structural responses" 2000

19 Popovics, S., "A numerical approach to the complete stress-strain curve of concrete" 3 (3): 583-599, 1973