The Structural Engineer > Archive > Volume 78 (2000) > Issues > Issue 12 > Lateral Loading on Masonry Arch Bridges
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Lateral Loading on Masonry Arch Bridges

The four-pin mechanism analysis of masonry arches may be extended to include lateral forces arising from at-rest soil pressure and the effects of live load. We demonstrate the effects of applying earth pressure at rest to the analysis with examples based on Bargower and Bridgemill Bridges. Boussinesq's soil pressure distribution is used to demonstrate the lateral loading effects of live loads, and both active and passive pressures are considered in relation to short-term live loading. Examples are based on the TRL's full-scale load tests, and we conclude that this development replicates the collapse loads at much lower passive pressures than originally proposed by the TRL. This note shows that the inclusion of lateral earth pressure is essential for a proper understanding of the forces involved and the estimation of factors of safety. David Van der Cruyssen