Modeling of Vertical Breakwater Wall under Bilateral Seawater Load

Document Type: Research Paper

Authors

1 Department of Civil Engineering, Roudehen Branch, Islamic Azad University, Roudehen, Iran

2 Department of Civil Engineering, Pardis Branch, Islamic Azad University, Pardis, Iran

Abstract

Floating breakwaters are widely used due to their various advantages over stationary breakwaters. Lots of researches have been done on hydrodynamics and the type of bracing of these kinds of structures in recent years. In this study, numerical modeling of stresses caused by collision waves has been investigated. For this purpose, samples of floating breakwaters have been modeled in ANSYS software. First, AQWA tool in ANSYS finite element software has been used. After calculating the force caused by the waves from this software module, the results are entered into the MECHANICAL module and the stress analysis is performed by this module. Next, the results of modeling have been validated with laboratory values. Finally, the stresses in the breakwater body have been investigated. The results show that highest amount of stresses caused by waves collision occur under a wave having a period equal to one of the natural periods of the structure and also due to the period distribution against the wave height, the highest possible wave altitude that occurs during a specific period causes the greatest stress.

Keywords


  1. Goldaran R, Lotfollahi Yaqin MA, Aminfar MH, (2016). Dynamic Interaction of Water and Structure Due to the Acoustic Waves with Fluid Simulation in Two Eulerian & Lagrangian Method. 13th Iranian Hydraulic Conference.
  2. Motlagh MSP, Farsiabi MM, Kamalan HR, (2005). An interactive environmental economy model for energy cycle in Iran. Journal of Environmental Health Science & Engineering, pp:2 (2): 41-56.
  3. Coastal Protection and Management Act, (1995). Queensland.
  4. Jan CD, Peng TH, Huang SJ, Hsu HC, (2015). An Experimental Field Study Using a Flexible High-Strength Net Breakwater for Shore Protection, Journal of Marine Science and Technology, 23(1) pp:117-126.
  5. Buring P, (2013). Flexible Quay Wall Structures for Container Vessels. MSc Thesis Delf University of Technology, Faculty of Civil Engineering and Geo Sciences Department: Hydraulic Engineering, Ports and Waterways.
  6. Van der Meer J, (2003). Design Aspects of Breakwaters and Sea Defences. 5th International Short Conference on Applied Coastal Research.
  7. Motta E, (1994). Generalized Columb Active-Earth Pressure for Distance Surcharge, J. Geotech. Eng. pp:120(6):1072-1079.
  8. Fang YS, Cheng FP, Chen RT, Fan CC, (1994). Earth Pressures under General Wall Movements. Southeast Asian Geotechnical Society, 24 (2).
  9. Caltabiano S, Cascone E, Maugeri M, (2000). Seismic Stability of Retaining Walls with Surcharge. Soil Dynamics and Earthquake Engineering, pp:20:469-476.
  10. Chen BF, Huang CF, (2002). Hydrodynamic Forces on Concrete Sea Wall and Breakwater During Earthquakes: Effects of Bottom Sediment Layers and Back-Fill Soil, Article in Ocean Engineering, pp:29(7):783-814.
  11. OCDI, (2002). Technical Standards and Commentaries for Port and Harbour Facilities in Japan. The Overseas Coastal Area Development Institute of Japan.
  12. Green RA, Olgun G, Ebeling RM, Cameron WI, (2003). Seismically Induced Lateral Earth Pressures on a Cantilever Retaining Wall, Sixth U.S. Conference and Workshop on Lifeline Earthquake Engineering (TCLEE).
  13. Kim SR, Kwon OS, Kim MM, (2004). Evaluation of Force Components Acting on Gravity Type Quay Walls during Earthquakes. Soil Dynamics and Earthquake Engineering, pp:24(11):853-866.
  14. Lai S, (1998). Rigid and Flexible Retaining Walls during Kobe Earthquake. International Conference on Case Histories in Geotechnical Engineering.
  15. Yang Z, Elgamal A, Abdoun T, Lee CJ, (2001). A Numerical Study of Lateral Spreading Behind a Caisson Type Quay Wall. International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
  16. Dewoolkar MM, Ko HY, Pak RYS, (2000). Experimental Developments for Studying Static and Seismic Behavior of Retaining Walls with Liquefiable Backfills. Soil Dynamics and Earthquake Engineering, pp:19(8):583-594.
  17. Cheng LH, Fen CY, Li YH, Jiang WY, (2013). Experimental Study on a New Type Floating Breakwater. Proceedings of the 7th International Conference on Asian and Pacific Coasts (APAC 2013) Bali, Indonesia.
  18. Koç ML, Balas CE, Koç Dİ, (2016). Stability Assessment of Rubble-Mound Breakwaters Using Genetic Programming. Ocean Engineering, pp:111:8-12.
  19. Teh HM, Ismail H, (2013). Hydraulic Characteristics of a Stepped-slope Floating Breakwater. 4th International Conference on Energy and Environment (ICEE).
  20. Behzad M, Akbari M, (2007). Experimental Investigation on Response and Efficiency of Moored Pontoon Type Floating Breakwater. Iranian Journal of Science & Technology, pp:95-99.
  21. Tsujio D, Yasuda T, Mase H, Mori N, (2013). Experimental Study on Effects of Reinforcement for Caisson Breakwaters against Abnormal Tsunami. Journal of Japan Society of Civil Engineers, Ser. B3 (Ocean Engineering), pp:69(2):473-478.