RESEARCH ON LATERAL INTERNAL FORCES OF A NEW TYPE OF CORRUGATED STEEL WEB BOX BEAM BASED ON ENERGY VARIATIONAL METHOD

Based on the basic principle of the energy variational method, considering the distortion of the box girder and the stress characteristics of the corrugated steel web, a control differential equation is established with the unknown shear force differenceTof the new corrugated steel web box girder bridge deck. The shear force difference is calculated using the comparable elastic foundation beam method, and the energy variational method solution of the transverse internal force of the new corrugated steel web box girder is obtained. It provides detailed analysis of the influence of the inclination angle and wave height changes of the corrugated steel web on the transverse bending moment. The results show that the analytical solution of the transverse internal force of the new type of corrugated steel web box girder solved according to the calculation formula in this article is in good agreement with the ANSYS numerical solution, indicating that the theoretical derivation in this article is accurate and reliable. With the increase of the inclination angle of the web plateθ,the load increases, the transverse bending moment at calculation pointAand load application positionFincreases sharply, while the transverse bending moment at calculation pointB, which is further away from the load application position. When gradually increasesθto approximately 35°, it hasM_A=M_B. As the wave height dw of the corrugated steel web increases, the transverse bending moment at cornerAand cornerBgradually increases, while the transverse bending moment at load pointFcontinuously decreases, and there is always a relationship ofM_F>M_A>M_B.