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Determining the Flexural Capacity of Long-Span Post-Tensioned LVL Timber Beams
| 题名： | Determining the Flexural Capacity of Long-Span Post-Tensioned LVL Timber Beams |
| 正文语种： | 英文 |
| 作者： | Wouter van Beerschoten, Ph.D.1; Gabriele Granello, Ph.D.2; Alessandro Palermo, Ph.D., M.ASCE3; and David Carradine, Ph.D.4 |
| 作者单位： | 1Engineering and Design Manager, Spanbild Projects, 112 Waterloo Rd., P.O. Box 11013, 8443 Christchurch, New Zealand. 2Lecturer, Dept. of Civil Engineering, Univ. of Canterbury, Private Bag 4800, 8041 Christchurch, New Zealand (corresponding author). 3Professor, Dept. of Civil Engineering, Univ. of Canterbury, Private Bag 4800, 8041 Christchurch, New Zealand. 4Structural Engineer, Building Research Association of New Zealand, 1222 Moonshine Rd., Private Bag 50908, 5381 Porirua, New Zealand. |
| 关键词： | Post-tensioned timber; Long-span beams; Timber beams |
| 摘要： | Post-tensioning can be used to introduce a precamber in timber beams, similar to concrete applications, resulting in decreased deflections and, hence, optimizing material usage. However, the amount of tendon post-tensioning or eccentricity can be significantly higher than in concrete applications because of the higher tensile strength of timber. Therefore, the secondary forces (generated by the tendon elongation) can increase the ultimate capacity of the post-tensioned member. To investigate these potential benefits, experimental testing to failure was carried out on four full-scale laminated veneer lumber (LVL) beam specimens, three of which were post-tensioned with unbonded tendons. A three-dimensional finite-element-model approach was proposed to simulate the behavior of the specimens. An analytical model was also developed to calculate the static response of the beams for a preliminary design by hand. Both modeling approaches, i.e., numerical and analytical, provided good results compared with the experimental data. Results indicated that post-tensioning can increase the load-carrying capacity of timber beams at the ultimate limit state up to 56%, especially if draped tendon profiles are used and the top flange of the beam is properly dimensioned to resist combined compression stresses from post-tensioning and bending moments. |
| 出版年： | 2019 |
| 期刊名称： | Journal of Structural Engineering |
| 卷： | 145 |
| 期： | 7 |
| 页码： | 1-13 |
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