Mechanism Properties Of Steel (beams)-Concrete (deck) Composite Bridge

This paper, Based on the support project of Qilihe Yellow River Bridge in Lanzhou City, It has studied the mechanical properties of steel(beams)- concrete(deck) composite bridge,and provide the causes of the design and bridge maintenance in the future.First of all, This paper describes the steel(beams)- concrete(deck) composite bridge structure of research status, and analysis of the consider slip effect of steel- concrete interface mechanism work,reviews the current steel- concrete composite beam bridge main research method. Lateral load distribution factors to consider slip effect correction formula is derived, Through practical engineering examples show that theoretical calculation results are compared with the measured value calculation. Further analysis of the various factors on steel(beams)-concrete(deck) composite bridge structure load transverse.Then, Steel(beams)- Concrete(deck) composite bridge stress and motivation at different factors were studied.Consider trends of the concrete bridge deck and steel beam tensile stressunder stress slip effect; Finally, The flexural vibration differential equations and the corresponding boundary conditions of Steel(beams)- Concrete(deck) composite bridge were derived,Analysis of slip effect consider natural frequency of the composite bridge.The main contents are listed as follows: during steel(beams)-concrete(deck) composite bridge design, in order to reduce the effect of the lateral partial load, the designer can increase the thickness of the concrete bridge deck, steel beam shear bond density and stiffness.Steel(beams)-concrete(deck) composite bridge stress analysis found that changes in stiffness of the largest factors. In the design of the steel beams reasonable stiffness can effectively reduce concrete bridge deck stress and tension stress the steel girder.With concrete deck thickness increases, shear studs density increases and the steel beams have increased rigidity of the the steel(beams)- concrete(deck) composite bridge structure of vibration frequency increases, steel girder stiffness change impact on the natural frequencies of the largest.and increased steel girder rigidity can effectively increase the steel- concrete composite bridge fundamental frequency.