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Volume 15, Issue 6, 2006
EXPERIMENTAL AND NUMERICAL INVESTIGATION ON OPTIMIZATION OF CLAMPED COMPOSITE COLUMNS: BY THE EXAMPLE OF CEDAR AND OAK
Yeliz Pekbey1,* Aydogan Ozdamar2 and Onur Sayman3
1,2 Department of Mechanical Engineering, Ege University 35100, Bornova-Izmir, Turkey
3 Department of Mechanical Engineering, Dokuz Eylul University 35100, Bornova-Izmir, Turkey
* Author to whom correspondence should be addressed, e-mail: yeliz.pekbey@ege.edu.tr
Received 21 August 2006; accepted 4 December 2006
ABSTRACT
In this study, the problem of finding the shape of the strongest column which has the largest fundamental buckling load with equal length and volume for the clamped–clamped ends was purposed. It was also proved that the solutions of Tadjbakhsk & Keller (1962) and Olhoff & Rasmussen (1977)-Masur (1984) were not optimum for columns with clamped ends. Then, true solution was obtained from Masur’s analytical bimodal solution for clamped-clamped case by considering the crushing criteria. To test the accuracy of new optimized columns with clamped ends, both experimental and numerical studies were carried out. In this study, natural composite materials such as cedar and oak with variable circular cross-sections were used. Results of the optimum model proposed in this study were in agreement with results obtained by experimental data and numerical results.
KEYWORDS: Optimal columns; shape design; bimodal solution; unimodal solution; crush strength |
