Structural form of core beam of main beam of full-bridge aeroelastic model for long-span double-box girder

Abstract

The invention discloses a structural form of a core beam of a main beam of a full-bridge aeroelastic model of a long-span double box girder, including outer molds of the double-box girder and core beams. The outer molds of the double-box girder include an outer mold of a left-box girder and an outer mold of a right-box girder. Each outer mold of the left-box girder and the right-box girder includes a plurality of spaced section outer molds arranged along the bridge. The core beams include main core beams disposed along the bridge and secondary core beams disposed along the transverse directionof the bridge. The main core beam and the secondary core beam are integrated structures. The main core beam is respectively arranged in the outer mold of the left-box girder and the right -box girder, and the main core beams run through all the section outer molds along the bridge. Each middle portion of the main core beams protrudes inwardly to form a right angle groove, which is corresponding to each section outer mold. The section outer molds corresponding to each outer mold of the left-box girder and the right -box girder are connected through one of the secondary core beams. According tothe structural form of the core beam of the main beam of the full-bridge aeroelastic model for the long-span double-box girder, the structural form of the core beam of the main beam of the full-bridge aeroelastic model is changed, and the pull-pressing rigidity of the single core beam of the double core beam is converted into the bending stiffness of the core beam, thereby greatly reducing the total stiffness of the main beam of the full-bridge aeroelastic model along the bridge.

Description

technical field [0001] The invention relates to the technical field of bridge engineering wind tunnel tests, in particular to a main girder core girder structure form of a large-span double box girder full bridge aeroelastic model. Background technique [0002] The wind tunnel test of the aeroelastic model of the long-span bridge is an important test method to ensure the safety of the bridge against wind. According to the requirements of the similarity ratio of the scaled-down experiment, the vertical stiffness, lateral stiffness and torsional stiffness of the bridge girder model must meet the similarity requirements. In order to meet the above stiffness requirements, the general bridge model is simulated by a metal core beam, such as a steel core beam. For the single-box girder, the single-core beam simulation is generally used, and very good results have been achieved; for the double-box girder, the simulation method of the single-box girder is generally used for referenc...

AI Technical Summary

Problems solved by technology

According to the existing processing methods and the requirements for the core beam, the transverse bridge stiffness is often far greater than the design value of the model, which cannot meet similar requirements

If the theoretical design requirements are compulsively met, the thickness of the core beam in the transverse bridge direction must be less than 1 mm. This has two problems: (1) The core beam itself is warped and unstable in the transverse direction due to the small transverse dimension of a single core beam, making it unusable; (2) The existing processing methods are difficult and cannot be connected with the external mold

Based on the above reasons, the lateral stiffness of the aeroelastic model of double box girder has always been a difficult problem, which cannot meet the needs of actual operation at all, and is often ignored, resulting in distortion of test results

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