oa Civil Engineer in South Africa - Slipping of PTFE bearings on long bridges



A study is made of the slips which occur in PTFE (or Teflon) bearings on long bridges with slender piers as a result of temperature change, creep and shrinkage. The static and dynamic coefficients of friction on PTFE bearings differ by up to a factor of two and this leads to 'stick-slip' behaviour. A mathematical model of the behaviour of the bearing is proposed and a numerical scheme for carrying out the calculation is presented. Results which are in broad agreement with observations are obtained.


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