Abstract：To comprehensively solve the two challenges of the fatigue crack of orthotropic steel decks and the vulnerability of bridge deck pavement, the innovative corrugated steel-UHPC composite bridge decks consisting of UHPC, corrugated steel deck, and MCL-shaped composite dowels were proposed. Two types of 12 full-scale models were designed and tested to investigate the flexural behaviors of the proposed innovative corrugated composite bridge decks under the actions of sagging and hogging moments, respectively. Based on the material constitutive relationship and internal force balance equation, the theoretical analysis method was established for the initial cracking moment, nominal cracking moment and ultimate bending capacity of the innovative corrugated composite bridge decks. Furthermore, the applicability of the theoretical analysis method was verified by the model test results. The results show that under the actions of sagging and hogging moments, the failure modes of all the test models appear to be the flexural failure and good ductility characteristic can be observed. Eliminating the steel-UHPC interface friction weakens the flexural behavior of the structure under the actions of sagging and hogging moments, and reduces the ultimate bending capacity by 4.3% and 4.2%, respectively. The longitudinal reinforcement ratio is another key factor affecting the flexural behavior under the action of hogging moment, and the ultimate bending capacity can be decreased by 7.6%. The theoretical analysis method has clear physical meaning and the theoretical results agree well with the test results. The research can provide the theoretical basis for the structuraldesign and analysis of bending capacity of the innovative corrugated steel-UHPC composite bridge decks.
