Large-span bridge high-order vortex vibration wind tunnel test model system and test method thereof

Abstract

The invention discloses a large-span bridge vortex vibration wind tunnel test model system and a test method thereof.According to the test model system, a plurality of adjusting parts are arranged on a base, each adjusting part is provided with a cantilever rod, all the cantilever rods are arranged in a cantilever mode in the same direction, and cantilever end portions of all the cantilever rods are provided with beam body models; the displacement measuring part is arranged below the cantilever rod, the horizontal distance between the displacement measuring part and the beam body model exceeds two times of the width value of the beam body model, the displacement measuring part is far away from the surface of the beam body model and the position under the beam body model, and state response data of the position of the cantilever rod can be collected in real time; the method effectively reduces the damping of a model system, improves the precision of technical parameters of the model, is simple and convenient to operate, is reliable, improves the real reliability of wind tunnel test data, and is suitable for large-scale popularization and application. And the requirement of a large-span bridge high-order vortex vibration wind tunnel test can be effectively met.

Description

technical field [0001] The invention relates to the technical field of bridge wind engineering tests, in particular to a large-span bridge vortex vibration wind tunnel test model system and a test method thereof. Background technique [0002] Modern long-span bridges (generally with a main span over 1,000 meters) generally adopt the basic structural forms of suspension bridges and cable-stayed bridges. Their soft structural characteristics make wind-resistant design one of the controlling factors in the design of such long-span bridges. Bridge vortex-induced resonance is the most common phenomenon in structural wind-induced vibration. It is a kind of self-excited vibration with limited amplitude. The amplitude generally does not exceed 30cm, and it has not attracted enough attention in the past. Since 2000, many world-class long-span suspension bridges with world-class design levels, such as the Dadai Bridge in Denmark, the Humen Bridge in my country, the Yingwuzhou Bridge i...

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Problems solved by technology

[0008] The purpose of the present invention is to overcome the multi-point elastically supported continuous beam aeroelastic model existing in the prior art. The sensor changes the aerodynamic shape of the model to a certain extent, and the signal power line of the sensor is unavoidably wound on the model. The damping of the model is increased, and the technical parameters of the model do not meet the test requirements, which seriously affects the accuracy and authenticity of the wind tunnel test results; and the arrangement of sensors under the model in the existing technology will bring disturbance to the wind field, thereby increasing the The damping of the wind field has uncertainty, which also leads to the inability to accurately evaluate the above-mentioned shortcomings of the impact on the wind field simulation results. A long-span bridge vortex vibration wind tunnel test model system is provided, and it also provides a long-span bridge vortex vibration Hole test model system test method

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