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Computers and Concrete Volume 6, Number 6, December 2009 , pages 451-472 DOI: https://doi.org/10.12989/cac.2009.6.6.451 |
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Flexural ductility of prestressed concrete beams with unbonded tendons |
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F. T. K. Au, K. H. E. Chan, A. K. H. Kwan and J. S. Du
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| Abstract | ||
| Based on a numerical method to analyse the full-range behaviour of prestressed concrete beams with unbonded tendons, parametric studies are carried out to investigate the influence of 11 parameters on the curvature ductility of unbonded prestressed concrete (UPC) beams. It is found that, among various parameters studied, the depth to prestressing tendons, depth to non-prestressed tension steel, partial prestressing ratio, yield strength of non-prestressed tension steel and concrete compressive strength have substantial effects on the curvature ductility. Although the curvature ductility of UPC beams is affected by a large number of factors, rather simple equations can be formulated for reasonably accurate estimation of curvature ductility. Conversion factors are introduced to cope with the difference in partial safety factors, shapes of equivalent stress blocks and the equations to predict the ultimate tendon stress in BS8110, EC2 and ACI318. The same equations can also be used to provide conservative estimates of ductility of UPC beams with compression steel. | ||
| Key Words | ||
| curvature ductility; full-range behaviour; prestressed concrete; unbonded tendon. | ||
| Address | ||
| F. T. K. Au: Department of Civil Engineering, The University of Hong Kong, Hong Kong, China K. H. E. Chan: Department of Civil Engineering, The University of Hong Kong, Hong Kong, China A. K. H. Kwan: Department of Civil Engineering, The University of Hong Kong, Hong Kong, China J. S. Du: School of Civil Engineering, Beijing Jiao Tong University, Beijing 100044, China | ||