Abstract
Thermal stresses in composite concrete deck slab‐on‐steel beam bridges can be significant in comparison to dead or live load stresses. Specifications by AASHTO do not provide guidance for the vertical temperature distribution through the depth of the composite bridge, while the Ontario Highway Bridge Design Code does require the designer to account for the effects of temperature differentials, but is deficient in several aspects. Based on a synthesis of several theoretical and experimental studies on prototype bridges, a simple but realistic vertical temperature distribution through the section depth is proposed. Maximum and minimum values of temperature differentials, consistent with observed field measurements, are also presented. The proposed distribution is linear through the depth of the slab and uniform through the depth of the steel beam. This distribution also leads to simple formulas to estimate the thermal stresses in simple and continuous composite bridges.
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