Document Type

Conference Paper

Publication Date

2025

Publication Title

Proceedings of the Annual Stability Conference Structural Stability Research Council

Pages

19 pp.

Abstract

Cold-formed tub girders provide an effective steel solution for short-span bridges. The girders are often delivered with an open top with stay-in-place forms installed on site. Walkways may be installed to the side of the girder that can induce significant torsion rotations in the open cross section. Full scale tests on girder specimens have shown that installing one or two panels of stay in place forms at the ends of the girder can significantly reduce the torsion rotation of the girder by providing warping resistance. Cantilever tests on the stay in place forms are performed to investigate the influence of different connection conditions and combinations of panels on the inplane diaphragm stiffness of the forms. An analytical model is developed that predicts the warping resistance provided by stay in place forms as a function of the in-plane diaphragm stiffness. This model can thus be used to determine the required stay in place form conditions to limit torsional rotations of tub girders during erection.

Rights

© 2025 American Institute of Steel Construction. All rights reserved.

Included with the kind written permission of the copyright holders.

Original Publication Citation

Barth, K. E., Seek, M. W., Michaelson, G. K., Pyrialakou, D., & Woldegabriel, B. T. (2025, April 1-4). Evaluating the effectiveness of stay-in-place forms to improve the torsional stability of box beam bridges during erection. Annual Stability Conference Structural Stability Research Council, Louisville, Kentucky. https://files.ssrcweb.org/proceedings/2025/Barth_et_al_SSRC_2025.pdf

ORCID

0000-0002-9137-8222 (Seek)

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