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There is a growing demand to asses the remaing strength and endurance of existingcomposite steel and concrete bridge beams due to the aging infrastructure, increases in permissible vehicleweights and increases in their frequencies. As codes are generally dedicated to the design of newstructures, new procedures are required to aid in the assesment of existing bridges to ensure that they areutilised to the full. In this paper, simple expressions are presented to perform partial-interaction analysesdirectly from full-interaction analyses, so that the beneficial effect of partial-interaction on the shear forceson the shear connectors can be utilised in assesment to extend the fatigue life of simply supported bridgebeams and to determine the effect of remedial work if necessary. Use of the assessment technique isdescribed by way of an illustrative example.