Investigation Of Punching Behaviour Of Self-compacting Fibre Reinforced Concrete Bridge Deck Slabs Reinforced By Basalt Fiber Reinforced Polymer Bars

Beam slab reinforced concrete bridge is one of the most widely used structures in highway bridges in the United States,Britain,Canada and China.The self compacting concrete structure with BFRP bars will reduce the problem of high carbon emissions of cement based products on the basis of effective solution to steel corrosion and improve the service life of the cement products,which is consistent with the sustainable development strategy and green energy-saving development strategy advocated by the state.The early engineering application results show that the new structure has good working performance,but at present,there is a lack of complete design theory,so it is necessary to further study its limit state.A large number of studies show that the punching failure is the ultimate bridge deck under wheel loads and the failure mode of,this paper focuses on the research of bridge deck under wheel load punching performance.The research mainly includes structural test research and finite element numerical simulation research.The structural test is mainly about the structural performance and failure mechanism of the concrete bridge deck with boundary restraint under the wheel load under static loading,with different reinforcement ratio,different reinforcement types and different kinds of concrete,and the contribution of concrete strain to the concrete bridge deck and the deformation of the cross beam are analyzed.The finite element numerical simulation analysis mainly uses ABAQUS to establish the same deck model as the structural test,and compares the structural test results,and analyzes the validity of the finite element model established by the bridge deck.And the selection of concrete strength,reinforcement ratio,bridge deck thickness and the stiffness of support beam is used as a structural parameter parametric analysis,by changing the different structure parameters,further analysis of the different structure parameters of bridge deck structure stress,deflection,failure mode and ultimate bearing capacity of structure performance.The results of structural test and finite element numerical simulation show that the deflection of BFRP reinforced self compacting fiber concrete can meet the requirements of standard under the normal load,and the application of BFRP bars in the construction of bridge deck is feasible.The types of concrete have no influence on the ultimate punching shear capacity of bridge decks.The bridge deck slab thickness can significantly improve the ultimate bearing capacity of bridge deck.The boundary constraint condition of bridge deck has significant influence on the ultimate bearing capacity and failure mode of bridge deck.By comparing and analyzing various theoretical calculation models,the theoretical model of punching shear ultimate bearing capacity of FRP reinforced concrete bridge deck is conservative due to neglecting the effect of Compression Membrane Action in bridge deck.BFRP bars combined with self compacting concrete fiber will be able to ensure good performance of the bridge structure,improve the structural durability and reduce carbon emissions,has significant scientific significance to establish a sustainable and green bridge structure.