Natural wind field vortex-induced vibration test device for large-span continuous steel box girder bridge super-large proportion aeroelastic model

Abstract

The invention provides a natural wind field vortex-induced vibration test device for a large-span continuous steel box girder bridge super-large proportion aeroelastic model. The natural wind field vortex-induced vibration test device comprises piers for fixing and supporting, a support for simulating boundary conditions of a main girder, a core girder for simulating rigidity of a box girder and acoat for simulating aerodynamic configuration. The main components of the device can be repeatedly used for many times, and various parameters can be conveniently adjusted so as to adapt to simulation requirements of different bridge projects. Compared with a wind tunnel test method, based on the test device, a test model is not limited by the size of a wind tunnel, the scale reduction ratio of the model can be multiple times that of a large wind tunnel test model, the rigidity, frequency ratio and wind speed ratio of the model can be improved, the Reynolds number is greatly increased, and the test precision is also improved; and large wind tunnel test equipment does not need to be occupied, and a large amount of energy consumption can be saved. Compared with a real bridge field test, theparameters of a bridge model can be conveniently changed, and the device can be repeatedly used for many times, so that comprehensive and systematic vortex-induced vibration research can be conductedmore conveniently, and the test difficulty and cost are greatly reduced.

Description

technical field [0001] The invention belongs to the technical field of vortex vibration test research of continuous steel box girder bridges in bridge wind resistance design, and relates to a test device for the research of vortex vibration in a super-large-scale aeroelastic model natural wind field of long-span continuous steel box girder bridges. Background technique [0002] Long-span continuous steel box girder bridges have the advantages of strong spanning capacity, high structural rigidity, good seismic performance, convenient construction, and smooth high-speed driving, which are favored by bridge designers. A large number of long-span continuous steel box girder bridges have been built around the world. In the future More continuous steel box girder bridges with longer spans will also be built. Due to the blunt section, light weight, small damping and low frequency of long-span continuous steel box girder bridges, there are many examples of large-scale vertical bendi...

AI Technical Summary

Problems solved by technology

Disadvantages include: (1) The wind tunnel test model is small (ratio 1:100-1:50), and the Reynolds number effect is obvious; (2) It requires a large-scale wind tunnel laboratory and has high energy consumption; (3) Wind tunnels are difficult to simulate complex natural wind field characteristics

The disadvantages include: (1) There are many problems in the layout of real bridge sensors, which are difficult, high investment, and high maintenance costs; (2) The frequency of bridge vortex vibration is limited, and the measured data is scarce, so it is difficult to obtain a large amount of measured data with research value; ( 3) Once the bridge is built, it is difficult to adjust the system parameters (aerodynamic shape, modal parameters, boundary conditions, etc.), and the research efficiency is low

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