Assessment of Second-Order Effect in Externally Prestressed Steel–Concrete Composite Beams
Publication: Journal of Bridge Engineering
Volume 26, Issue 6
Abstract
Externally prestressed steel–concrete composite (EPSCC) beams in their deformed configuration are characterized by changes in the effective depth of external tendons. However, little information is available on this second-order effect and parameters that are closely related to it, such as the deviator spacing and load type, have never been analyzed. This study will describe an in-depth investigation of the second-order effect in EPSCC beams. By applying an experimentally validated model, numerical simulations will be performed to assess the effect of the ratio of deviator spacing to span length (Sd/L) and load type on the behavior of EPSCC beams. The results show that the second-order effect was negligible for Sd/L <0.25. The ultimate load decreases linearly with an increasing Sd/L from 0.25 to 1. An increase in Sd/L resulted in a decrease in ultimate tendon stress increment. Compared with two-point or uniform loading, one-point loading at midspan led to substantially lower ultimate tendon stress and deflection, and therefore, a lower second-order effect. An equation that considers the second-order effect will be proposed to estimate the ultimate tendon stress in EPSCC beams. The proposed equation showed a good correlation with the numerical simulations.
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Acknowledgments
The work has been supported by the National Natural Science Foundation of China under Grant No. 51978549.
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Published In
Journal of Bridge Engineering
Volume 26 • Issue 6 • June 2021
Copyright
© 2021 American Society of Civil Engineers.
History
Received: Sep 6, 2020
Accepted: Jan 14, 2021
Published online: Mar 24, 2021
Published in print: Jun 1, 2021
Discussion open until: Aug 24, 2021
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