Study on Mechanical Performance of Steel Bridge Deck Pavement with Prefabricated and Cast-in-situ UHPC Slab

To solve the problem of shrinkage cracking, the need for intensive reinforcement and a large number of steaming equipment of orthotropic steel bridge deck pavement caused by large area of cast-in-situ ultra high performance concrete (UHPC), a new type of steel bridge deck pavement using prefabricated and cast-in-situ UHPC slab was presented. Through local specimen tests on the interfaces between steel and prefabricated UHPC slab, steel and cast-in-situ UHPC slab, prefabricated and cast-in-situ UHPC slab, the bonding properties of the key interfaces of steel deck pavement with prefabricated and cast-in-situ UHPC slab were revealed. The load effects of steel deck pavement with prefabricated and cast-in-situ UHPC slab under vehicle load were determined by full-size segment specimen test and finite element analysis. The results show that the tensile and shear failures of the interface between steel and prefabricated UHPC slab occur at the bonding surface of the viscose layer and prefabricated UHPC slab, the normal tensile and tangential shear capacity can be conservatively 5. 2 MPa and 8. 7 MPa; when the stud spacing is between 150 and 320 mm, the stud intensity has little effect on the shear capacity of interface between steel and cast-in-situ UHPC slab. The stud bearing capacity in cast-in-situ UHPC slab can be calculated according to the Chinese code, and the shear stiffness can be conservatively set at 110. 0 kN · mm-1; The shear strength of prefabricated and cast-in-situ UHPC interface can be respectively increased by 23% and 20% by gouging the interface and steam curing the wet joints. The shear strength of the prefabricated and cast-in-situ UHPC interface can be conservatively 2. 4 MPa; Under the action of 3 times of vehicle design load, the stress of UHPC slab and steel-UHPC interface is less than the allowable stress. Therefore, the steel bridge deck pavement scheme using prefabricated and cast-in-situ UHPC slab proposed in this paper is feasible. © 2022 Xi'an Highway University. All rights reserved.