Author(s)

R.J. Fishwick & D.W. Begg

Abstract

A segmental arch constructed from concrete blocks is tested to failure as validation of a discrete automatic limit analysis technique. A mesh description of geometric compatibility, based on Kirchhoffs network laws, provides the model on which collapse is defined. A minimisation of the work rate of the parametric loads provides a prediction of the failure load and configuration of collapse through the use of a Linear Program. However, the predicted strength of the test structure is significantly overestimated. A detailed set of geometric measurements were seen to reveal small imperfections in the concrete blocks which when assembled create a geometrically flawed structure. The flexibility of the procedure allows for such imperfections to be incorporated

Keywords