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For continuous composite girders, loss of composite action over interior supports leads to strength and stiffness reduction. This paper is presenting experimental program on a new construction approach to maintain composite action at negative moment regions. Carbon fibber reinforced polymer (CFRP) sheet bonded to top of concrete slab at negative moment region for continuous composite girders. Four two-span continuous composite girders tested to failure each with a total length of five meters. CFRP sheet thickness is the only variable considered in the testing program. Girders designed to develop full composite action between concrete slab and steel section. For negative moment region, shear connectors designed to develop full composite action between CFRP sheet, slab reinforcement and steel section. Steel section designed as fully compact to eliminat e any secondary failures. Experimental results demonstrated the effectiveness of this construction approach to maintain the composite action at negative moment region for service loading. The stiffness and strength of the continuous composite girders improved.

Construction Approach to Maintain Composite Action for Continuous Composite Girders