Abstract
In order to improve the stiffness and shear bearing capacity of steel-UHPC composite bridge, an innovative shear connector named arc-shaped reinforcement shear connector was proposed and compared with the stud and perforated bar steel plate shear connector using the static push-out test. Considering shear connector diameter, a total of ten push-out specimens for five groups were designed. The results indicated that the failure modes and failure mechanism of the arc-shaped reinforcement shear connectors were significantly different from stud shear connector and perforated bar steel plate. Obvious failure characteristics such as crack and reinforcement were not observed for the arc-shaped reinforcement specimens except for fine cracks on the top of one specimen, but these were observed for the others two types of shear connector. The relative slip value of arc-shaped reinforcement shear connector at the maximum load was the smallest and less than 1 mm in three types of shear connectors. The stiffness and shear bearing capacity of arc-shaped reinforcement were higher than those of stud and perforated bar steel plate under the same diameter. Increasing arc-shaped reinforcement diameter could improve significantly static behavior of shear connector. When the diameter of arc-shape reinforcement was increased from 8 mm to 12 mm, the ductility factor, stiffness, and shear bearing capacity of arc-shaped reinforcement shear connector were improved by 174.32%, 214.76%, and 54.2%, respectively. A calculation method of shear bearing capacity was proposed by the least square method and multiple regression analysis and agreed well with the test result.
Highlights
Steel-concrete composite structure is the preferred structure for long-span bridge all over the world
Pu is the maximum load in the test process; δu is the relative slip value corresponding to the maximum load; Pavg is the average load value; δavg is the relative slip value corresponding to the average load; Dc is the ductility factor of the specimens; and Dcavg is the average of Dc
The shear performance of an innovative arcshaped reinforcement shear connector was analyzed compared to the two traditional shear connectors and the main research conclusions can be summarized as follows: (1) Compared to the two traditional shear connector, the failure modes and failure mechanism of arc-shaped reinforcement shear connector specimens were found to be obviously different
Summary
Steel-concrete composite structure is the preferred structure for long-span bridge all over the world. Aiming at the technical problems of traditional bridge such as the limited spanning ability and poor durability [1], Shao et al [2] took the superior performance of UHPC into composite structure and innovatively proposed the steelultra high performance concrete (UHPC) composite bridge, which effectively reduced the self-weight, the cracking risk in the negative moment zone, and the fatigue stress amplitude of the steel structure [3]. Stud, channel steel, and PBL (perfobond rib) are commonly used as shear connector in the traditional steel-concrete composite structure, and extensive research had been conducted [4,5,6]. PBL shear connector showed good shear behavior, but it was difficult to be used in fabricated structure; it consumes much steel and needs high cost
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