Research on Pre-eccentricity Design of Small Radius Curved Beam Bridges Supported by Single Point Hinge of Middle Piers
The bending torsion coupling effect of the small radius curved beam bridge supported by single point hinge support of the middle pier is obvious and the torsional resistance is weak.Improper design can cause signifi-cant safety hazards.Taking the interchange ramp bridge in Changsha Airport Avenue Renovation Project in Hunan Province as an example,the finite element model of the bridge was established by Midas civil software.Under curve radii of 40,60,80,and 100 m,the effects of pre-eccentricity on the distribution of reaction forces between the in-ner and outer supports of the side piers,the torque at the middle support point and beam end,as well as the torsional deformation at the support point and mid span were analyzed to propose the reasonable pre-eccentricity values of the middle pier for curved beams.When the curve radii were 40,60,80,and 100 m,the reasonable pre-eccentricity values of the middle were 0.50,0.35,0.30,and 0.25 m,which were 45.0％,49.5％,57.6％,and 60.3％of the corresponding pre-eccentricity values for the side pier support reaction equilibrium.
curved beam bridgemiddle pier pre-eccentricitysingle point hinge supportprestress
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