Experimental Study On Static Behavior Of Negative Moment Zone In Steel-concrete Composite Bridge Deck With PBL Connectors

The bridge deck bears the wheel load directly in the bridge structure.Being exposed to the natural environment for a long time,the bridge deck is easy to be damaged.As an important part of the structure,the state of the bridge deck affects the comfort and functionality of the bridge structure.Therefore,how to select an appropriate bridge deck should be concerned.The steel-concrete composite slab with PBL shear connectors is a form of composite structure,which has been used as bridge deck in recent years,with excellent performance and broad application prospects.However,at present,the research on steel-concrete composite slabs with PBL shear connectors under negative bending moment is not enough,and the crack calculation needs to be further improved.Based on the experimental study,theoretical analysis and numerical simulation,this thesis studied the steel-concrete composite slab with PBL shear connectors under the action of negative moment.The contents were as follows:(1)Experimental studythe static test of six simply supported composite slabs with PBL shear connectors was carried out.The loading mode was four-point loading with negative bending moment.The influence of PBL rib height and whether it was equipped with transverse reinforcement was studied.The characteristic load,load deflection curve and load strain curve of each specimen were measured.The failure mode was analyzed and the development of cracks was Compared.(2)Theoretical calculationOn the basis of the test results,some assumptions were made.The cracking load and ultimate load of the steel-concrete composite slab with PBL shear connectors were theoretically analyzed and the reasonable calculation formulas were established.The crack development theory of the steel-concrete composite slab was studied and the crack formula of the composite slab with PBL under the negative moment was established,which could provide theoretical basis for practical engineering.(3)Finite element simulationThe specimens were simulated by ABAQUS,the calculations were verified by the test results.What’s more,the parameter analyses on the bearing capacity were carried out,including the influence of concrete strength,steel strength,arrangement direction of shear connector,diameter of PBL rib.The results provided some reference for practical engineering.