<abstract xmlns="http://www.w3.org/1999/xhtml"><p>Imposed and restrained deformations cause stresses in continuous concrete bridges, and in analyses of the superstructure these stresses are usually reduced to some degree due to creep and cracking of concrete. This study examines cracking and redistribution of stresses in a bridge superstructure under the loads and load combinations used in the original bridge design. The subject of this study is a three-span post-tensioned continuous concrete cantilever beam bridge. The bridge was analysed with non-linear calculation utilising the general force method and moment-curvature relationships. The analysis yielded the bending stiffness of the post-tensioned bridge superstructure as a function of bridge length under different loads. It was discovered that the secondary moment from prestressing force increased as the bending stiffness of the central span decreased due to cracking under external loads, which is not normally considered in design. The bending moment effects of linear temperature difference and support settlement decreased as expected as the superstructure bending stiffness decreased. The analysis provided new information on the effects of secondary moment from the prestressing force and on the difference between the cracked state and the linear elastic analysis of the concrete bridge superstructure.</p></abstract>

Imposed and restrained deformations cause stresses in continuous concrete bridges, and in analyses of the superstructure these stresses are usually reduced to some degree due to creep and cracking of concrete. This study examines cracking and redistribution of stresses in a bridge superstructure under the loads and load combinations used in the original bridge design. The subject of this study is a three-span post-tensioned continuous concrete cantilever beam bridge. The bridge was analysed with non-linear calculation utilising the general force method and moment-curvature relationships. The analysis yielded the bending stiffness of the post-tensioned bridge superstructure as a function of bridge length under different loads. It was discovered that the secondary moment from prestressing force increased as the bending stiffness of the central span decreased due to cracking under external loads, which is not normally considered in design. The bending moment effects of linear temperature difference and support settlement decreased as expected as the superstructure bending stiffness decreased. The analysis provided new information on the effects of secondary moment from the prestressing force and on the difference between the cracked state and the linear elastic analysis of the concrete bridge superstructure.

Influence of Cracking on Effects of Restrained Deformations in a Post-tensioned Concrete Bridge

Nordic Concrete Research

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.

Imposed and restrained deformations cause stresses in continuous concrete bridges, and in analyses of the superstructure these stresses are usually reduced to...

Influence of Cracking on Effects of Restrained Deformations in a Post-tensioned Concrete Bridge

Published Online: Dec 31, 2018

Page range: 95 - 110

Received: Mar 16, 2018

Accepted: Nov 29, 2018

DOI: https://doi.org/10.2478/ncr-2018-0017

Keywords
restrained deformations, concrete cracking, post-tensioned concrete, bridge

© 2018 Kimmo Jalonen et al., published by Sciendo

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.

Influence of Cracking on Effects of Restrained Deformations in a Post-tensioned Concrete Bridge

Published Online: Dec 31, 2018

Page range: 95 - 110

Received: Mar 16, 2018

Accepted: Nov 29, 2018

DOI: https://doi.org/10.2478/ncr-2018-0017

Keywordsrestrained deformations, concrete cracking, post-tensioned concrete, bridge

© 2018 Kimmo Jalonen et al., published by Sciendo

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.

Keywords
restrained deformations, concrete cracking, post-tensioned concrete, bridge