About the author:

1. Guangxi Xinfazhan Communication Group Co., Ltd., Nanning, Guangxi 530029, China;2. Guangdong Shengxiang Traffic Engineering Testing Co., Ltd., Guangzhou, Guangdong 511400, China

Abstract:

To clarify the influence of the parameters such as steel fiber type, ordinary reinforcementratio, and stud arrangement on the working performance of steel⁃UHPC composite bridge deck slab undernegative bending moment, five large⁃scale test models of composite slabs were made indoors and staticbending tests were completed. The influence of steel fiber type, ordinary steel reinforcement ratio, studarrangement on the working performance of composite slab specimens was analyzed. The experimentalresults show that increasing the reinforcement ratio of ordinary steel bars, adjusting ( adding ) thearrangement of studs, and using end hook steel fibers can improve the ultimate bearing capacity ofcomposite slabs ( not exceeding 11%), making the entire bridge deck slab more evenly stressed, withmore uniform crack distribution and no obvious main cracks, but it will lead to significant reduction incracking load and earlier occurrence of cracks; In addition, the above measures can significantly improvethe overall performance and structural stiffness of the steel⁃UHPC composite bridge deck slab, enablingthe bottom steel plate to participate in stress more evenly and avoiding local stress concentration andbuckling failure of the steel plate caused by rapid cracking of the upper concrete.