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Tsunami effects on coastal structures

Tsunami effects on coastal structures. Jawad Elwir- University of Hawaii at Manoa aelwir@gmail.com (808) 781-9288 Mentors: Dr. Riggs - University of Hawaii at Manoa Dr. Robertson - University of Hawaii at Manoa 8/2/2012 JAWS SUPERCOMPUTER. Outline. Project description.

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Tsunami effects on coastal structures

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  1. Tsunami effects on coastal structures Jawad Elwir- University of Hawaii at Manoa aelwir@gmail.com (808) 781-9288 Mentors: Dr. Riggs - University of Hawaii at Manoa Dr. Robertson - University of Hawaii at Manoa 8/2/2012 JAWS SUPERCOMPUTER

  2. Outline • Project description. • Importance of the project. • Model setup. • Results. • Summary. • Acknowledgements.

  3. Project Description • Impact of a wood log hitting a concrete column in: a- Longitudinal direction. b- Transverse direction.

  4. Why This Research Is Important • Design stronger buildings, bridges, roads, etc. • Save human lives.

  5. Numerical Method • Pole: 19.67 ft long, 0.82 ft diameter • Modeled as elastic material • Column: 12.00 ft Long, 0.50 ft diameter. • Modeled as rigid material • 2.68 mph

  6. Longitudinal Impact Results. • The force obtained from • the f36 kips. • The duration time • The force calculated from given equation • kips • The duration time calculated from given equation:

  7. Transverse Impact • I performed two mesh convergence studies: a- Finite element convergence study. b- Time step convergence study. • Convergence study will enable us to obtain accurate results.

  8. Finite Element Convergence Study Results • The coarse mesh contained 2100 elements and it gave a force • of 23 kips. • The fine mesh contained 100,000 element and it gave a force • of 12 kips. • The time step was 0.001 ms.

  9. Time Step Convergence Study Results • The coarse mesh gave a force • of 12 kips. • The time step was 0.001 ms. • The fine mesh gave a force • of 22 kips. • The time step was 1 microsecond.

  10. Discussion Of Transverse Impact Results • The force obtained from the Convergence studies were 12 kips and 22 kips. • The duration time = 4ms. • The force calculated from given equation: = kips. • The duration time calculated from given equation: =2.4 ms.

  11. Intended Future Work • Examine discrepancy between transverse impact results from LS-DYNA and given equations. • Create a mesh for square concrete column.

  12. Gantt Chart

  13. Summary • During this summer I worked on modeling a wood pole hitting a concrete column in the longitudinal direction and transverse direction. • The longitudinal impact results obtained from the model correlate well with given equations. • The transverse impact results obtained from the model do not correlate well with given equations.

  14. Acknowledgments • This material is based upon work supported by the National Science Foundationunder Grant No 0852082 • Eid Khowitar • Adam McGuire • Matthew Wesley • Evan Greer • H. Ronald Riggs • Ian Robertson • Hawaii Open Supercomputing Center (HOSC)

  15. Sources • Paczkowski K., Riggs, H.R., Naito C.J, Lehmann. A. one-dimensional model for impact forces resulting from high mass, low velocity debris. Structural Engineering and Mechanics. Vol. 42. No. 6. 2012. Pages 831-847. • LS-DYNA Theory Manual • Oliver, s. “Physical properties of common woods ."Wood Properties : 21 Oct. 2009. http://www.csudh.edu/oliver/chemdata/woods.htm

  16. Questions?

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