Abstract
Field-cast ultra-high performance concrete (UHPC) connections are an innovative and prospective solution for combining full-depth precast concrete decks and steel girders. However, previous studies show that the slip capacity of stud shear connectors embedded in UHPC cannot meet the requirements for ductile connectors by Eurocode 4, which can reduce the resistance of steel and concrete composite members. In this study, the rubber-sleeved stud shear connector, which is a composite of ordinary stud and rubber sleeve, was adopted for the field-cast UHPC connections. Push-out tests were conducted to investigate the static and fatigue behavior of the rubber-sleeved stud shear connector as part of field-cast UHPC connections. Results of static tests showed that the rubber-sleeved stud shear connector has sufficient deformation capacity and its slip capacity is 1.5 times that of the ordinary stud shear connector. Compared to ordinary stud shear connectors, UHPC with high strength and stiffness has a relatively small effect on improving the shear strength and stiffness of rubber-sleeve stud shear connectors. Results of fatigue tests showed that the rubber-sleeved stud shear connector in UHPC has similar fatigue behavior to that in normal strength concrete. Though UHPC improves the restraint to the stud deformation, the influence of rubber sleeves is still decisive in determining the fatigue behavior of rubber-sleeve stud shear connectors. In addition, based on the results of strain gauges at stud roots, it was found that the crack initiation process consumes a small proportion of the fatigue life of rubber-sleeved stud shear connectors, which is about 5%.
Highlights
The full-depth precast concrete deck system is one of the promising technologies for accelerated bridge construction (ABC) of steel and concrete composite bridges [1,2]
It can be concluded that there is no necessity to consider the effects of ultra-high performance concrete (UHPC) and welded collars when calculating the shear strength of rubber-sleeved stud shear connectors
The difference between two types of shear connectors in shear strength is undoubtedly determined by the present of rubber sleeves
Summary
The full-depth precast concrete deck system is one of the promising technologies for accelerated bridge construction (ABC) of steel and concrete composite bridges [1,2]. Researches on stud shear connectors as part of the field-cast UHPC connections for steel and concrete composite bridges are lacking so far. In 2018, Wang et al [17] proposed a novel steel-UHPC composite system, and UHPCs were used as the filling material for the shear pocket on precast normal strength concrete (NSC) slabs. Have shown that rubber-sleeved stud shear connectors have higher maximum slip capacities than ordinary stud shear connectors They can be used in UHPC to improve the connection ductility. Based on the fatigue test results, the fatigue strength curve was investigated and the deformation behavior of the connectors was described and analyzed
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