@inproceedings{964323fbc53545738dcd4b8eb6318e7c,
title = "How to consider the effects of longitudinal joint imperfections on internal forces in segmental tunnel linings",
abstract = "Small geometrical imperfections are inevitable when assembling concrete segments to a circular segmental tunnel lining. As a result, small translational and rotational contact imperfections occur in the longitudinal joints between the segments. As these imperfections sum up, they can significantly influence the internal forces in the lining. While the normal forces are not very sensitive to imperfections, the bending moments and, consequently, the stresses in the lining can be significantly increased. In structural design, imperfections are typically taken into account in local analyses (e.g. stress distribution at joints). In the overall calculation of internal reactions, however, imperfections are mostly neglected or considered with approaches that strongly simplify the structural behavior. A more accurate and realistic investigation of this influence is achievable with numerical models that explicitly include the longitudinal joints and potential imperfections with contact formulations. Therefore, first, a suitable modeling strategy was developed. However, these calculations are time-consuming if many combinations have to be considered and only supported by limited available calculation programs. Therefore, it is shown and verified how imperfections can be considered in asimplified way with one-dimensional bedded beam models and rotational springs. The simplified approach's results approximate well the numerical model's results with discrete joints and contact formulations.",
keywords = "assembly, FEM, imperfections, structural design, TBM, tolerances",
author = "Fabian Rauch and Oliver Fischer",
note = "Publisher Copyright: {\textcopyright} 2024 The Author(s).; ITA-AITES World Tunnel Congress, WTC 2024 ; Conference date: 19-04-2024 Through 25-04-2024",
year = "2024",
doi = "10.1201/9781003495505-43",
language = "English",
isbn = "9781032800424",
series = "Tunnelling for a Better Life - Proceedings of the ITA-AITES World Tunnel Congress, WTC 2024",
publisher = "CRC Press/Balkema",
pages = "315--322",
editor = "Jinxiu Yan and Tarcisio Celestino and Markus Thewes and Erik Eberhardt",
booktitle = "Tunnelling for a Better Life - Proceedings of the ITA-AITES World Tunnel Congress, WTC 2024",
}