Test method for determining unbalance loading deflection of box girder bridge based on single-girder finite element model

Abstract

The invention relates to a static load test method for bridge deflection, and discloses a test method for determining the unbalance loading deflection of a box girder bridge based on a single-girder finite element model, and the method comprises the steps: calculating the overall deflection and torsion angle of a control cross section of a box girder under an eccentric test load based on the single-girder finite element model, and calculating a cross section deflection lateral distribution value through the geometrical relation between a torsion center and a deflection measurement point. Compared with other methods, the method has the advantages of simplicity, high efficiency and reliable result, can effectively reduce the time and labor cost, and reduces the energy consumption; the methodis applied to a bridge static load test, can cope with field loading and measurement point position adjustment at any time, responds to the requirement for rapid modification of a test scheme, avoidshysteresis quality of large finite element calculation and analysis, and facilitates real-time judgment of the bearing capacity condition and the structural safety of the concrete box girder bridge structure.

Description

technical field [0001] The invention belongs to a static load test method for bridge deflection, in particular to a test method for determining the eccentric load deflection of a box girder bridge based on a single beam finite element model. Background technique [0002] The bridge static load test is a complicated bridge bearing capacity appraisal work, and the calculation of the partial load deflection of the structure under the load is an important content. According to the control load determined before the test, the test load that produces equivalent internal force or deformation on the structural control section is calculated, and the test load is applied to the bridge structure in stages. By detecting the static response of the structure at the test position (such as stress (change), displacement, etc. , rotation angle, etc.) is a common method for judging the mechanical performance and bearing capacity of the structure by comparing it with the theoretical calculation...

AI Technical Summary

Problems solved by technology

The eccentric pressure method is a method based on the two assumptions of the approximate absolute rigidity of the beam and the neglect of the torsional stiffness of the main beam. The modified eccentric pressure method considers the torsional stiffness of the main beam compared with the eccentric pressure method. Both methods are Deduced from the calculation model of the ribbed girder bridge, it is quite different from the force and deformation of the closed box section, which leads to the distortion of the calculation of the partial load deflection

Therefore, the l

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