Long-Term Behavior of Composite Beams under Positive and Negative Bending. II: Analytical Study
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Volume 136, Issue 7
Abstract
The creep, shrinkage, and cracking of concrete may induce time-dependent changes in the stresses, internal forces, and deflections of steel-concrete composite beams. This paper presents an analytical model to consider these effects in analyzing the long-term behavior of composite beams under service loads using the step-by-step procedure. Under negative moments, the model accounts for the cracking, stress relaxing, tension stiffening, creep, and shrinkage of concrete. Meanwhile, a method is proposed to calculate the maximum crack width of the concrete slab by considering the shrinkage and creep effects. Four composite beams continuously loaded for about 3 years were analyzed using the proposed model. A good agreement is observed between the experimental results and the calculations by the proposed model. A discussion is also made about the aging coefficients in the age-adjusted effective modulus method under different loading conditions.
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Acknowledgments
This study was financed by the National Natural Science Foundation of China (Grant No. NNSFC50408001). The writers would like to express their gratitude to NSFC for the support.NSFC
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Information
Published In
Journal of Structural Engineering
Volume 136 • Issue 7 • July 2010
Pages: 858 - 865
Copyright
© 2010 ASCE.
History
Received: Mar 12, 2009
Accepted: Dec 20, 2009
Published online: Dec 29, 2009
Published in print: Jul 2010
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