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PROCEEDINGS OF THE EIGHTH INTERNATIONAL CONFERENCE ON COMPUTATIONAL STRUCTURES TECHNOLOGY
Edited by: B.H.V. Topping, G. Montero and R. Montenegro
Physical and Finite Element Shear Load Response Modelling of Viscoelasticity Materials
R. Cajka and P. Manásek
Department of Building Structures, Faculty of Civil Engineering, VSB - Technical University of Ostrava, Czech Republic
R. Cajka, P. Manásek, "Physical and Finite Element Shear Load Response Modelling of Viscoelasticity Materials", in B.H.V. Topping, G. Montero, R. Montenegro, (Editors), "Proceedings of the Eighth International Conference on Computational Structures Technology", Civil-Comp Press, Stirlingshire, UK, Paper 240, 2006. doi:10.4203/ccp.83.240
Keywords: asphalt, finite element method, friction parameters, shear stress, sliding joint.
The objective of this paper is to show the practical application of sliding joints in constructions exposed to relative horizontal deformation. A real construction of an underground running track has been used for the calculation of the construction with the sliding joint. The underground running track is a part of the CEZ Aréna in Ostrava, Vítkovice. The subsoil under the running tunnel is influenced by mining activities. The territory is subject to the relative horizontal deformation caused by the undermining: .
In order to confront individual cases, the calculation has been done first for the construction without the sliding joint and then for the construction with the sliding joint, using the Czech standard currently in force. Original relations for the calculation of the shearing stress have been based, however, on tests of non-modified asphalt felts that were used twenty years ago. Now, the scope of application of the asphalt felts is limited. For that reason, the laboratories of the Faculty of Civil Engineering, VSB - Technical University of Ostrava test now oxidised as well as modified asphalt felts that are suitable for the sliding joints . The results of the laboratory tests are used for proposals of practical procedures applied when calculating the constructions with the sliding joints.
The application of the rheological sliding joint in the subsoil may considerably decrease the shearing forces as shown in Figure 1. This method is efficient because the asphalt felts have a specific behaviour when exposed to the shearing forces that generate a viscous flow. The applicability of this method has been verified in the past  for non-modified asphalt felts.
The running track can be regarded as a shell structure placed in an elastic subsoil. The calculation has been carried out using NEXIS, a finite element software.
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