Deformation Analysis of Prestressed Continuous Steel-Concrete Composite Beams
Publication: Journal of Structural Engineering
Volume 135, Issue 11
Abstract
Deformation calculation of prestressed continuous steel-concrete composite beams accounting for the slip effect between the steel and concrete interface under service loads is analyzed. A simplified analytical model is presented. Based on this model, formulas for predicting the cracking region of concrete slab near the interior supports and the increase of the prestressing tendon force are derived. A table for calculating the midspan deflection of two-span prestressed continuous composite beams is also proposed. It is found that the internal force of the prestressing tendon under service loads can be accurately calculated using the proposed formulas. By ignoring the increase of the tendon force, the calculated deflection are overestimated, and considering the increase of the tendon force can significantly improve the accuracy of analytical predictions. As the calculated values show good agreement with the test results, the proposed formulas can be reliably applied to the deformation analysis of prestressed continuous composite beams. Finally, based on the formulas for calculating the deformation of two-span prestressed continuous composite beams, a general method for deformation analysis of prestressed continuous composite beams is proposed.
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Acknowledgments
The writers gratefully acknowledge the financial support provided by the National Natural Science Foundation of China (Grant Nos. NNSFC50438020 and NNSFC50828803), Changjiang Scholars, and Innovative Research Team in University (Grant No. UNSPECIFIEDIRT00736)
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Published In
Journal of Structural Engineering
Volume 135 • Issue 11 • November 2009
Pages: 1377 - 1389
Copyright
© 2009 ASCE.
History
Received: Aug 10, 2008
Accepted: Apr 20, 2009
Published online: Oct 15, 2009
Published in print: Nov 2009
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