The Structural Engineer > Archive > Volume 68 (1990) > Issues > Issue 14 > Semi-empirical Studies of a Timber Bridge Guardrail Under Static Transverse Loading
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Semi-empirical Studies of a Timber Bridge Guardrail Under Static Transverse Loading

A timber bridge guardrail specimen, subjected to static loads, was mathematically modelled as a beam on coupled, elastic supports. The spring coupling was provided by the bridge deck structure to which the line of guardrail posts was attached. The spring stiffnesses used as input to the model were determined experimentally by transversely loading each post of a timber guardrail section of a longitudinal laminated deck bridge after the guardrail member was removed. Using these stiffnesses, the model was executed to predict the deflections of the reassembled guardrail system. The model proved to be a good predictor of both rail-displaced shape and magnitude of deflection. Superiority of the coupled spring model over a similar model assuming independence (uncoupled springs) of posts in the system was demonstrated. P.J. Pellicane, Professor R.M. Gutkowski and M.S. Malone