Research On The Theory And Technology Of Testing The Bearing Force Of Curved Bridge

With the rapid development of China's urban transportation construction, curved bridge has become an important bridge style in modern transportation infrastructure. However, because of the complexity of its mechanical properties, curved bridge is influenced by radius of curvature, central angle, beam breadth and the ratio of bending and torsion stiffness apart from being effected by the span of the bridge, the section form and the reinforcement ratio, which is quite complicated. In the specification, without giving the detection scheme of flexural bearing capacity of the bridge, there are still many problems of the bearing capacity detection theory and technology unresolved yet, which has a significant influence to the correct evaluation of the work performance and bearing capacity of this kind of bridge.This paper firstly introduces the mechanical characteristics and structural characteristics of curved bridge and the theoretical analysis method. With the three span continuous curved box girder bridge of 30m+40m+30m as an example, the paper uses the finite element software Midas civil to analysis of curved beam bridge, combines the finite element software Midas FEA to establish the solid element model and makes a lot of calculations and comparisons. Secondly, compare and analysis the data of the load test condition, the size and position of the control section of the main stress, the size and position of the bottom of beam radius along the tangent direction tensile. Third, through the comparison of two kinds of stress, it is confirmed that the beam flexural tensile stress at the bottom can replace the principal stress playing the role of control, and also the bounded direction of strain gauges is determined, so is the derivation of the error formulas due to the paste of the deflection angle of the strain gauges.