Sliding Joints and Soil-Structure Interaction

Use of a sliding joint is an effective method to decrease the stress in foundation structure where there is a horizontal deformation of subsoil (areas afflicted with underground mining) or horizontal deformation of a foundation structure (pre-stressed foundations, creep, shrinkage, temperature deformation). A convenient material for a sliding joint is a bitumen asphalt belt. Experiments for different types of bitumen belts were undertaken at the Faculty of Civil Engineering - VSB Technical University of Ostrava in 2008. This year an extension of the 2008 experiments is in progress and the shear resistance of a slide joint is being tested as a function of temperature in a temperature controlled room. In this paper experimental results of temperature dependant shear resistance are presented. The result of the experiments should be the sliding joint shear resistance as a function of deformation velocity and temperature. This relationship is used for numerical analysis of stress/strain relation between foundation structure and subsoil. Using a rheological slide joint could lead to a decrease of the reinforcement amount, and contribute to higher reliability of foundation structure and thus enable design of more durable and sustainable building structures.

Authors:

• Radim Cajka
• Pavlina Mateckova
• Martina Janulikova
• Marie Stara

Keywords:

• Pre-stressed foundations
• sliding joint
• soil-structure interaction
• subsoil horizontal deformation.

References:

[1] V. Balcarek, J. Bradac: "Utilization of bitumen insulating stripes as
sliding joints for buildings on undermined area," Civil Engineering
Journal, vol. 2, 1982, in Czech.
[2] R. Cajka, P. Manasek: Application of slide joints for shear stress
elimination of prestressed foundation, in Ninth Pan American Congress
of Applied Mechanics, proceedings of conference, Mérida, Yucat├ín,
Mexico, 2006
[3] R. Cajka, P. Manasek: "Laboratory tests and numerical modeling of
rheological sliding joints," journal Roczniki insynierii budowlanej -
vol. 5, 2005, Katowice, Poland.
[4] O. Luetkens: Bauen im Bergbaugebiet. Berlin, New York, Wien:
Springer-Verlag, 1957
[5] CSN 730039: Design of building structures at undermined areas. Basic
requirements, Czech code, Prague, 1990, in Czech