C. MELBOURNE Bolton Institute
J.A. HODGSON L.G. Mouchel and Partners seconded to Ballon Institute

A series of test on skewed brickwork arch bridges is described and compared with a similar series of tests on square span brickwork arch bridges. Several significant conclusions are put forward: skew increased the stiffness but not the strength of the equivalent square span barrel; none of the hinges which formed at collapse were parallel with the abutments; more than four hinges were required for a kinematically admissible mechanism to form, the spandrel walls and backfill interacted and influenced the magnitude of the carrying capacity and the mode of collapse.