Experimental research on bending performance of steel – UHDCC composite bridge deck structure in negative moment region
Source abstract
Abstract
To solve the typical damages such as cracking of the pavement in the negative moment region of steel bridges and steel-concrete composite structures, ultra-high ductility cementitious composites (UHDCC) was developed. The experimental research on the bending performance of steel - UHDCC composite test beams in the negative moment region was carried out based on theoretical analysis, model experiments, and numerical simulations. Three sets of single U-ribbed steel-concrete composite beam experiments were completed to investigate the bending capacity, stiffness, section strain distribution characteristics, and crack propagation mode of the test beams in the negative bending moment zone. The formula for the ultimate flexural bearing capacity of steel UHDCC composite beams was derived based on plastic design theory. And the parametric study on ultimate flexural bearing capacity was conducted through finite element model. Experimental results demonstrated significant enhancement in the cracking load, ultimate load, and bending stiffness of the Steel - UHDCC composite test beams compared to the Steel - NC composite test beams. Then, the steel - UHDCC composite beams were mainly characterized by microcracks, showing a fine and dense distribution of cracks. In addition, the finite element parametric analysis shown that the thickness of UHDCC pavement had the greatest impact on the ultimate bending capacity of composite beams, followed by the reinforcement ratio of rebars, and the influence of shear connector distance was relatively small. Finally, the formula for the ultimate flexural bearing capacity of steel UHDCC composite beams was derived, and the deviation rate met the design accuracy and engineering application requirements. The research results of this manuscript can provide theoretical reference for the design of steel - UHDCC composite bridge deck structures.
Source: openalex_inverted_index · Quality: baseline
Research context
OpenAlex topics: Innovative concrete reinforcement materials · Structural Behavior of Reinforced Concrete · Concrete Corrosion and Durability
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
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