Curved Bridge Grillage Model Updating

In recent years, with the rapid development of China’s modernization, transportation booming, highways, urban overpass and viaduct increasingly promoted the emergence of a large number of curved bridge. Torque generated by large tendons is huge, if tendons improper configuration or tension less or more sheets, the area is not enough when it design, construction will cause stress exceeds the tensile strength of concrete, cracks, then shorten the life of the structure.Therefore, this article focuses on the characteristics, as well as common diseases, with cracks appearing in Longjiang interoperability ramp bridge were analyzed to explore the causes of cracks.Curved beam bridge depends largely on the size of the impact of the curvature. Curved bridge mechanics analysis is very complex, generally use spatial analysis techniques. For wide-span ratio B / L is relatively small and horizontal linkages strong curved girder bridges in general can be done in a single beam structure, but for the most number of curved girder bridges is calculated by a single beam structure is distorted. Therefore, this paper established Longjiang bridge of grillage model, segmentation based on the web at the box girder is divided into four stringers B1, B2, B3 and B4. To ensure accuracy, the beams are spaced set to 1.0m. Finally, according to the characteristics of cantilever box girder, to create a virtual vertical and horizontal beam member.From a practical engineering, combined Longjiang Interchange bridge static load test to measure continuous box girder under the test load control section of the structural response, using optimization algorithms, through the establishment of the objective function and constraint functions, correct in grillage model calculations and experimental values under the different condition. The model can be effectively applied to further calculations Bridge performance evaluation, damage identification analysis.