The results are presented of 46 tests on 1:2 scale models of upper in-situ reinforced concrete half joints. The variables examined were reinforcement arrangement, reinforcement percentage, eccentricity, horizontal load and bearing type. It was found that improved service load behaviour is obtained when inclined reinforcement is provided in a half joint. Bearing type was found to have a significant effect on the failure load of a half joint: with a soft bearing causing a 45% decrease in load carrying capacity compared with a steel bearing. A simple method is proposed for predicting service load strains, stresses and maximum crack widths in a half joint. The method gives satisfactory agreement with both the reported and independent test data.

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