Optimizing Double Launching Noses for Incrementally Launched Equal-Span Continuous Girder Bridges
Publication: Journal of Bridge Engineering
Volume 26, Issue 7
Abstract
To select the parameters of double launching noses during the launching construction of multi-span concrete continuous girder bridges, a simplified calculation model for the main girder and double launching noses was constructed in this study based on the example of a three-span concrete continuous girder bridge. First, the analytical expressions for the internal forces of each node were derived. Second, the influence of different launching nose parameters on the maximum negative moment at the fulcrum and the maximum positive moment within the span were studied. Finally, taking a real bridge as an example, a reasonable and rigorous method for optimizing the launching nose parameters was proposed to consider the optimization of the maximum negative moment at the fulcrum and the maximum tensile stress at the section; the optimal launching nose parameters were obtained through iterative calculations. The proposed optimization method for launching nose parameters is simple and can be used for specific optimization of different section forms. The results of this study suggest a reliable and rigorous optimization calculation method for launching nose parameters.
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Acknowledgments
The authors gratefully acknowledge the financial support provided by the National Natural Science Foundation of China (Grant No. 51708269) and the Foundation of A Hundred Youth Talents Training Program of Lanzhou Jiaotong University. The constructive comments from the editor and reviewers are also greatly appreciated.
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Information & Authors
Information
Published In
Journal of Bridge Engineering
Volume 26 • Issue 7 • July 2021
Copyright
© 2021 American Society of Civil Engineers.
History
Received: Aug 13, 2020
Accepted: Mar 19, 2021
Published online: May 12, 2021
Published in print: Jul 1, 2021
Discussion open until: Oct 12, 2021
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