Shear Performance Of Studs Of Composite Deck System Composed Of Steel And CRRPC Layer

The mechanical properties of the steel box girder and the concrete bridge deck are closely related to connection method between them. The stud shear connector is often used in construction, which is mainly to transfer the interfacial shearing force and to resist the lifting force between steel beam and concrete deck. Stud shear connectors are used in Composite Deck System composed of steel deck and CPPPC Layer in this paper and the mechanical properties of them were studied. The main achievements are as follows:This paper concluded current situation of application about traditional steel bridge deck pavement. The main material performances of reactive powder concrete(RPC) were summarized and compared to normal concrete. Composite Deck System composed of steel deck and CPPPC Layer was raised at last.This paper majorly focused on the anti-shear performance of Composite Deck System composed of steel deck and CPPPC Layer. The classification and characteristics of traditional shear connectors were introduced. As a research o bject, the anti-shear performance and anti-shear fatigue performance about stud shear connectors were concluded in the paper.Supported by the ANSYS finite element method, this paper studied the shear capacity, load-slip curve and shear stiffness in the Pu sh-out test. The test's result shows: the bonding effect between the steel deck and CRRPC influences a lot on mechanical properties of specimen. With bonding effect, shear capacity can raise 42%, and slip fall 31%. If bonding effect is ignored, Shear stiffness of stud is 52.5N/mm, in constantly, the value is 120.6N/mm.Based on the Push-out test's results, influence of different stress ratio and different styles of Interface connection to fatigue life w ere studied, this paper carried out push-out fatigue test, and slip-load times curves were established. The test's result shows: Stress ratio is one of main influence to fatigue life. Stress ratio of 0.4 is suggested in the push-out fatigue test when bonding effect is ignored between bridge deck and CRRPC pavement; Bonding effect is another main influence to fatigue life. At the Stress ratio of 0.4, equivalent fatigue life of one specimen reached 922 thousand times with bonding effect considered. In contrast, fatigue life of one specimen only reached 169 thousand times.In order to furtherly study the performance of whole studs in beam of Composite Deck System composed of steel deck and CPPPC Layer, the ANSYS finite element method was used to a single main girder of the 2nd Yueyang Dongting Bridge. The study shows: The feature of slip of studs is almostly as the same to shear stress, which increases from mid-span to the beam end. But the maximum of slip and shear stress are not at the end of beam. At last, full-scale composite beam fatigue test was carried out by loading in the mid-span. The test result shows: Fatigue failure under equivalent stress amplitude of Dongting bridge didn't occur to the composite beam after 59.122 million load times when studs were place by 125mm×125mm even no bonding effect considered.