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Method for controlling multi-mode vibration of inhaul cable

A control method and multi-modal technology, applied in the field of cable structures, can solve problems such as affecting the optimal parameters of dampers and vibration reduction effects, difficulty in bridge installation, difficulty in installation and maintenance, etc.

Active Publication Date: 2020-10-20
TONGJI UNIV
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AI Technical Summary

Problems solved by technology

The actual measurement results show that this method is not effective in controlling the high-order vortex vibration of the cables, and the method is difficult to install on bridges in the operation phase.
In addition, the method of installing a high-order vortex damper for controlling the cable at the end of the tower also has problems such as installation and maintenance difficulties; adding a damper at the end of the beam will affect the optimal parameters and vibration reduction effect of the original damper

Method used

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  • Method for controlling multi-mode vibration of inhaul cable
  • Method for controlling multi-mode vibration of inhaul cable
  • Method for controlling multi-mode vibration of inhaul cable

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Embodiment Construction

[0031] The present invention will be further described below in conjunction with the embodiments shown in the accompanying drawings.

[0032] Such as figure 1 As shown, the present invention firstly provides a damper and TMD combined control method, which is optimized for the multi-mode vibration of the cable. First, the cable-damper-TMD system analysis model is established considering the sag effect, and the complex eigenfrequency equation of the system is obtained.

[0033] With sag cable-viscous damper-TMD system such as figure 2 shown. The cable is placed horizontally, the chord length is L, the horizontal tension is H, the mass per unit length is m, and the axial stiffness is EA. The damper has a damping coefficient of c and is installed at a distance l from the anchorage end of the left cable 1 location.

[0034] The stiffness, damping and mass of the TMD are denoted by k d 、c d 、m d means that ω d is the natural circular frequency of TMD, and ξ is the damping ...

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Abstract

The invention provides an inhaul cable low-order wind and rain vibration and high-order vortex vibration integrated control damper and tuned mass damper (TMD) combination scheme and an optimal designmethod thereof. The method comprises the following steps that the position and parameters of a damper are designed according to the additional damping requirement of modal vibration with the cable frequency being 3.0 Hz or below; according to the position of the damper, the mode that the high-order vortex-induced vibration of the cable is easy to occur is determined, wherein the damper is close tothe stationary point of the vibration when the cable vibrates; and the installation position and parameters of the TMD are determined according to the mode that the high-order vortex vibration is likely to happen. According to the method, the hidden danger of high-order vortex vibration of a common inhaul cable-damper system can be eliminated, and the TMD has no influence on optimization parameters and the vibration reduction effect of the damper. The installation position of the TMD is close to the cable end damper, installation, maintenance and replacement are convenient, and the device issuitable for vibration treatment of inhaul cables of newly-built structures and inhaul cables of existing structures.

Description

technical field [0001] The invention belongs to the field of cable structures, and relates to the vibration control technology of the cable structure, in particular to the multi-mode vibration control technology of the cable of the cable-stayed bridge. Background technique [0002] Due to the characteristics of light weight, axial bearing capacity and high rigidity, stay cables have been widely used in the field of structural engineering, including cable-stayed bridges, suspension bridges, suspension rod arch bridges, and mast tower structures anchored by cables. Taking the typical cable-stayed bridge as an example, it has been widely constructed all over the world, especially in China, due to its aesthetic and economical advantages. As of 2019, a total of 55 cable-stayed bridges with a span of more than 500 meters have been built in the world, and my country has 36; a total of 47 cable-stayed bridges with a span of more than 500 meters are under construction, and my country...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G05D19/02E01D19/16E01D11/04
CPCG05D19/02E01D19/16E01D11/04
Inventor 狄方殿陈林孙利民
Owner TONGJI UNIV
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