Studies on Mechanical Model of Geometrically Pre-eccentric Optimization Based on a Small Radius Ramp Curved Bridge with Single Column in City

摘要

Under the coupling action of bending and torsion are there such complex mechanical characteristics in a small radius ramp curved bridge with single column in city. Based on Midas/Civil software, a small radius ramp curved bridge with single column is studied in this paper. Under the combined action of the first phase of dead weight, the temperature gradient, the system temperature, the second phase of dead weight and vehicle load, the mechanical properties of a ramp curved beam bridge have been studied in detail for different pre-eccentricity. Then, it is under different eccentric actions that different results with the changes of such variations as support reaction, displacement, shear force, bending moment, torque moment and torsion deformation are discussed. Our investigation shows that reasonable pre-eccentric setting could greatly reduce internal force in the bridge and improve the torque distribution so as to optimize the distribution of internal force in bridge.