Prediction of the buckling stress of intermediate wooden columns using the secant modulus |
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| Authors: | Hiroshi Yoshihara Masamitsu Ohta Yoshitaka Kubojima |
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| Institution: | (1) Faculty of Science and Engineering, Shimane University, Nishikawazu-cho 1060, Matsue, Shimane 690, Japan;(2) Graduate School of Agricultural and Life Sciences, The University of Tokyo, 1-1-1 Yayoi, Bunkyo-ku, Tokyo 113, Japan |
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| Abstract: | We made several buckling tests of wooden columns with intermediate slenderness ratios ( ) and examined the empirical formulas. On the basis of the examination, we formulated an equation for predicting the buckling stress ( ) of an intermediate wooden column. Sitka spruce (Picea sitchensis Carr.) and buna (Japanese beech, Fagus crenata BI.) were used for the studies. A compressive load was applied on the specimen supported with pin ends, and the buckling stress was predicted by the tangent modulus theory and two empirical equations: those of Tetmajer and Newlin-Gahagan. The predicted - relations were compared with the test results, and the applicability of these predictions were examined. Based on the comparisons, we formulated an equation that can predict the - relations of materials with various stress-strain characters in the plastic strain range. |
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| Keywords: | Buckling stress Intermediate column Tangent modulus theory Empirical formulas Secant modulus |
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