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Formulas for Curvature Ductility Design of Doubly Reinforced Concrete Beams

Published online by Cambridge University Press:  05 May 2011

C. C. Chen  and
S. M. Hsu
C. C. Chen*
Affiliation:
Department of Construction Engineering, National Taiwan University of Science and Technology, Taipei, Taiwan 10672, R.O.C.
S. M. Hsu*
Affiliation:
Department of Construction Engineering, National Taiwan University of Science and Technology, Taipei, Taiwan 10672, R.O.C.
*
* Professor
** Postdoctor
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Abstract

With the concrete treated as unconfined, semi-empirical equations for curvature ductility ratios of doubly reinforced beam sections were derived. Based on the resulted semi-empirical equations, design formulas for curvature ductility ratios, which take into account the effect of tension and compression reinforcement ratios and strengths of reinforcement and concrete, are established and calibrated. The proposed design formulas are fairly simple with reasonable accuracy. The proposed design formulas enable the designer to design beam sections for selected ductility ratios, and, consequently, to acquire better control of concrete spalling during major earthquakes. From the aspect of performance based design, the proposed formulas can facilitate beam design for concrete spalling limit state.

Keywords

Reinforced concrete beamCurvature ductilitySeismic designConcrete spalling
Type
Articles
Information
Journal of Mechanics , Volume 20 , Issue 4 , December 2004 , pp. 257 - 265
Copyright
Copyright © The Society of Theoretical and Applied Mechanics, R.O.C. 2004

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