Grid structure for controlling girder induced vibration of split steel box girder bridge
A grid structure, vortex-induced vibration technology, applied in bridges, bridge parts, bridge construction, etc., can solve the problems of complex structure, high economic cost, large deflector size, etc., to achieve convenient installation, simple structure, and economical good performance
Active Publication Date: 2012-06-27
CCCC HIGHWAY CONSULTANTS +1
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Problems solved by technology
However, for some bridges with split steel box girders, the control effect of the deflector is not obvious. In order to control the amplitude of the vortex-induced vibration within an acceptable range, the size of the deflector needs to be made relatively large, so that It will lead to complex structure and high economic cost
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[0018] The present invention will be further described below in conjunction with the accompanying drawings.
[0019] See Figure 1~5 , is the grid structure for controlling the vortex-induced vibration of the main girder of the split steel box girder bridge in the present invention, so as to control the amplitude of the vortex-induced vibration of the main girder of the split steel box girder bridge. Among them: grid structure 1; grid 2; grid support frame 3; split steel box girder 4; central slot 5; steel box girder 6; connecting beam 7; bridge 8; length A of grid structure; grid width B of the structure; height h of the grid 1 ;Height h of the grid support frame 2 ; Grid structure layout area length L1; bridge main span length L.
[0020] The grid structure 1 includes a grid 2 and a grid support frame 3 . The height of grid 2 is h 1 (h 1 =0.04~0.4m), the air permeability is 30%~90%, and its material can be steel, fiberglass-reinforced plastics (Fiberglass-Reinforced Pl...
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The invention discloses a grid structure for controlling the girder induced vibration of a split steel box girder bridge, and relates to bridge technology. The grid structure comprises a grid and a grid supporting frame. The grid is arranged on the upper surface of the grid supporting frame, and the grid is fixed to the upper surface of the grid supporting frame in a welding or bolting manner so as to be positioned on the top of a central groove of the split steel box girder; the top surface of the grid is flush with the top surface of the split steel box girder; and the circumferential rim of the grid is fixed on a steel box girder of the split steel box girder and a connecting cross beam. The plane of the grid supporting frame is pound-shaped or star-shaped; and the cross section of thegrid supporting frame is I-shaped or rectangular. The grid structure is longitudinally arranged along the bridge and is broken at the connecting cross beam of the split steel box girder; the length of the arrangement region is 1 / 2 to 1 time of the main span length of the bridge; and the air permeation rate of the grid structure is 40 to 80 percent. The grid structure can inhibit vortex produced by air which passes through the split steel box girder, thereby effectively controlling the induced vibration of the split steel box girder, and the grid structure is simple in structure, convenient toassemble and good in economic property.
Description
technical field [0001] The invention relates to the technical field of bridge engineering, and relates to a grid structure for controlling vortex-induced vibration of a main girder of a split steel box girder bridge. Background technique [0002] Split steel box girder is a form of main girder of bridges. This type of main girder is used in many bridges such as Xihoumen Bridge of Zhejiang Zhoushan Liandao Project, Hong Kong Stonecutters Bridge, Qingdao Bay Bridge and Dagu River Channel Bridge. The results of the wind tunnel test show that the bridge using the split steel box girder as the main girder may experience large-amplitude vortex-induced vibration of the main girder under certain conditions, and it is necessary to take effective measures for vibration control. [0003] The vortex-induced vibration of the main girder of the bridge is a vibration phenomenon caused by the regular vortex shedding generated when the air flow passes through the main girder under certain co...
Claims
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IPC IPC(8): E01D19/00E01D2/04
Inventor 刘高孟凡超王麒绍新鹏
Owner CCCC HIGHWAY CONSULTANTS