A stay cable combined vibration damping device and method

Abstract

The invention relates to the technical field of structural vibration control, in particular to a combined vibration damping device and method for stay cables. The method includes the following steps: determining the fundamental frequency of vibration of the stay cables according to parameters of the stay cables; reducing vibration according to the stay cables Determine the installation position of the external damper according to the requirements; determine the vibration stagnation point frequency of the stay cable at the installation position according to the fundamental frequency of the stay cable and the installation position of the external damper; Determine the control frequency of the tuned mass damper to be installed; install the external damper according to the installation position of the external damper, and install the tuning cable on the stay cable between the anchor point and the external damper Mass damper. It can solve the problem that the external damper is installed at the vibration stagnation point in the prior art, and the vibration frequency adjacent to the vibration frequency corresponding to the stagnation point cannot be used to effectively reduce vibration, and the external damper of the stay cable has poor control effect on the high frequency vibration of the stay cable. The problem.

Description

technical field [0001] The invention relates to the technical field of structural vibration control, in particular to a stay cable combined vibration damping device and method. Background technique [0002] With the development of science and technology, the research and development of new materials and new technologies, the span of cable-stayed bridges has been continuously broken through, and the number of cable-stayed bridges with a main span of more than 1 000m is also increasing. This has also led to the increasingly wide application of ultra-long stay cables ("Cable-stayed external viscous dampers" JT / T 1038-2016 stipulates that ultra-long stay cables with a length of more than 450m are ultra-long stay cables). For long stay cables, the flexibility of ultra-long stay cables will increase and the damping will be greatly reduced, so different types of vibrations are more likely to occur under dynamic load excitation. A large number of engineering examples show that supe...

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Problems solved by technology

[0004] Aiming at the defects existing in the prior art, the object of the present invention is to provide a cable-stayed combined damping device and method, which can solve the problem that the installation position of the damper required by the external damper in the prior art is relatively high, resulting in external The installation position of the built-in damper is the vibration stagnation point, which cannot effectively perform the vibration reduction function; at the same time, it solves the problem that the high-frequency vibration of the cable stay causes damage to the external damper of the cable stay and affects the vibration reduction effect

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