Study On Structural Form And Applicability Of Orthotropic Steel-RPC Composite Deck With New Large Longitudinal Rib

Orthotropic steel bridge deck was widely used in modern bridge engineering for its light weight, saving steel, big ultimate bearing capacity and widen engineering adaptation. However, because of its Longitudinal and horizontal ribs are staggered welded, weld numerous, structure complex, resulting in rib plate lap stress concentration problems outstanding, fatigue cracking and pavement damage frequently. Through innovativing deck structure and developing new bridge deck, which offers a comprehensive solution for the steel deck fatigue cracking and pavement damage. A new orthotropic steel deck RPC composite bridge deck with large Longitudinal ribs is taken as the research object, the form of longitudinal ribs and the Longitudinal ribs and transverse bulkheads junction structure form were studied; the study on how the Structure form of lower part of the new composite bridge deck impact on RPC transverse tensile stress is launched deeply on this basis, the new orthotropic steel deck RPC composite bridge deck with large Longitudinal ribs was used to a large span suspension bridge to study the new RPC composite bridge deck’s applicability in typical Long span bridges. Through the work above concluded that:(1) Compared with the traditional orthotropic steel deck, the new orthotropic steel deck RPC composite bridge deck with large Longitudinal ribs mechanical performance and deck local stiffness are improved significantly with a smaller increase in the weight;(2) Japanese style large Longitudinal ribs orthotropic steel deck RPC composite bridge deck is better than the German style large Longitudinal ribs orthotropic steel deck RPC composite bridge deck in mechanical performance and stability, thus, recommend Japanese style large Longitudinal ribs as new bridge deck stiffeners;(3)Box girders with solid diaphragms is taken for studying, diaphragm aperture form is compared. For the minimum fatigue hot-spot stress of the diaphragm aperture free edge and U ribs to determine diaphragm aperture reasonable form;(4)The tensile stress of RPC at the top of Longitudinal web is very sensitive to the transverse loading position and maintain a high level of stress within a certain distance, so the Longitudinal web arranged in a steel box girder should be designed to be far away from the traffic lane;(5)The crossbeam spacing, RPC and U-rib thickness significantly impact on RPC tensile stress. Longitudinal web spacing and thickness of the steel roof structure lightly impact on the tensile stress of RPC layer;(6)The new orthotropic composite deck has excellent applicability for large-span suspension bridge, and gives a more safety reserve.