1. 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 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. Project description. Importance of the project. Model setup. Results. Summary. Acknowledgements.

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

4. Design stronger buildings, bridges, roads, etc. Save human lives.

5. 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

7. 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. 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. 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.

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

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

15. 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?