Research On Mechanical Behavior Of Corrugated Steel-concrete Composite Bridge Deck With PBL Connectors

Corrugated steel-concrete composite deck slab is a new type of structure developed based on steel-concrete composite structure.Compared with the traditional reinforced concrete slab,it has lighter weight and can give full play to the two material properties of steel and concrete.Compared with steel bridge deck(orthotropic plate),it has better fatigue resistance.However,the study of this new structure has not been perfected yet.In order to explore the mechanical behavior of corrugated steel-concrete composite deck with PBL shear connectors,improve the present situation of large gap between steel and concrete interface of composite bridge deck,and apply to actual projects.PBL shear connectors and corrugated steel-concrete composite deck are analyzed by finite element method.The main research contents of the paper are as follows:(1)The push out test of PBL shear connectors was simulated by the general finite element software ANSYS Workbench.The influence of the factors such as the thickness,aperture size,number of holes,material strength,transverse penetration reinforcement and other factors on the stress characteristics of PBL shear connectors was discussed.Results shows that the opening of PBL shear connector can significantly improve it’s bearing capacity,reduce the slip between interfaces,and enhance the synergistic ability of two kinds of materials steel and concrete.The ultimate slip-resistance of PBL shear connectors is positively related to the number of holes but the magnitude of the increase is decreasing.The concrete dowels in the PBL shear connectors will begin to fail gradually under the effect of a relatively small ultimate load,and the increase in the diameter of the PBL shear connectors will not significantly increase the failure load of the concrete dowels.(2)The stress of corrugated steel-concrete composite deck slab with different span was analyzed by using the general finite element software ANSYS Workbench.The load slip performance,the gap between steel and concrete interface and the bending bearing capacity were emphatically studied.It is concluded that adding the stud to the corrugated steel edge of the corrugated steel-concrete composite bridge deck and the disposal site of wave peak can solve the problem of setting off the steel plate in the middle span of the composite bridge deck.At the same time,the adding of the stud can improve the flexural and slip resistance bearingcapacity of the composite bridge deck and reduce the slip between the interface.(3)Based on the calculation formulas of the bearing capacity of the profiled steel-concrete composite plate and the flexural bearing capacity of the steel plate-concrete composite deck slab,the formula for calculating the bending capacity of corrugated steel-concrete composite deck slab suitable for this study was proposed.The calculation result shows that the formula and the finite element calculation result have a good agreement,and with the increase of the span,the coincidence degree shows an increasing trend,which can provide reference for the actual engineering calculation.(4)According to the "specifications for design of highway steel structure and bridge" and practical application requirements,2 comprehensive optimization objectives for corrugated steel-concrete composite deck slab were proposed.The multi-objective optimization design of corrugated steel-concrete composite deck slab was carried out by using the influence surface optimization module and parameter correlation module of ANSYS Workbench platform.The MOGA iterative algorithm(multi-objective genetic algorithm)was selected to get the optimal design scheme satisfying the constraint conditions.By comparing the changes of design indexes before and after optimization,it shows that the optimization effect is good.