Behaviour of bolted cast iron joints

The structural testing and finite element (FE) analysis described in this paper were part of a major research project undertaken at Imperial College London to investigate the deformation of bolted segmental grey cast iron (GCI) tunnel linings. A key aim was to quantify how joints influence the behav...

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Veröffentlicht in:Tunnelling and underground space technology 2017-09, Vol.68, p.113-129
Hauptverfasser: Tsiampousi, Aikaterini, Yu, Jessica, Standing, Jamie, Vollum, Robert, Potts, David
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container_title Tunnelling and underground space technology
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creator Tsiampousi, Aikaterini
Yu, Jessica
Standing, Jamie
Vollum, Robert
Potts, David
description The structural testing and finite element (FE) analysis described in this paper were part of a major research project undertaken at Imperial College London to investigate the deformation of bolted segmental grey cast iron (GCI) tunnel linings. A key aim was to quantify how joints influence the behaviour of the lining, through a three-path approach comprising physical experiments, finite element modelling, and field instrumentation. The laboratory results have been used to assess the validity of the tunnel assessment methods used by industry. This study examined joint articulation under the serviceability limit state in the absence of hoop force focussing on factors such as applied bolt preload, the loading direction and the freedom of the circumferential flange to deflect. Two half-scale GCI lining segments were bolted together at the longitudinal flanges to form a bolted arch in a similar fashion to the tests performed by Thomas (1977). Modern instrumentation was implemented to gain detailed measurements quantifying changes in global displacements of the two segments, bolt forces and joint opening under applied loading. For the first time, the physical experiments were conducted contemporaneously with the development of a three-dimensional FE model of the joint. The experimental data and the results from the FE analysis indicate a reduction in joint stiffness as the joint articulates under applied load. It is shown that the presence of a joint has far greater influence on the behaviour of the ‘arch’ than the level of preload applied to the bolts in the joint. The FE analysis allowed the deformation behaviour of the joint under positive and negative bending to be investigated: its response under the two modes differs significantly.
doi_str_mv 10.1016/j.tust.2017.05.009
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For the first time, the physical experiments were conducted contemporaneously with the development of a three-dimensional FE model of the joint. The experimental data and the results from the FE analysis indicate a reduction in joint stiffness as the joint articulates under applied load. It is shown that the presence of a joint has far greater influence on the behaviour of the ‘arch’ than the level of preload applied to the bolts in the joint. 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subjects Arches
Bolted joints
Cast iron
Deformation
Finite element analysis
Finite element method
Flanges
Grey cast iron
Instruments
Iron
Joint articulation
Linings
Mathematical analysis
Segments
Stiffness
Studies
Three dimensional models
title Behaviour of bolted cast iron joints
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