CN102031749B - Grid structure for controlling girder induced vibration of split steel box girder bridge - Google Patents

Grid structure for controlling girder induced vibration of split steel box girder bridge Download PDF

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CN102031749B
CN102031749B CN 200910093762 CN200910093762A CN102031749B CN 102031749 B CN102031749 B CN 102031749B CN 200910093762 CN200910093762 CN 200910093762 CN 200910093762 A CN200910093762 A CN 200910093762A CN 102031749 B CN102031749 B CN 102031749B
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grid
steel box
box girder
bridge
grid structure
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CN102031749A (en
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刘高
孟凡超
王麒
绍新鹏
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CCCC Highway Consultants Co Ltd
CCCC Highway Long Bridge Construction National Engineering Research Center Co Ltd
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Abstract

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 the grid 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 to assemble and good in economic property.

Description

控制分体式钢箱梁桥梁的主梁涡激振动的格栅结构Grid Structure Controlling Vortex-Induced Vibration of Main Girder of Split Steel Box Girder Bridge

技术领域 technical field

本发明涉及桥梁工程技术领域，是一种控制分体式钢箱梁桥梁的主梁涡激振动的格栅结构。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.

背景技术 Background technique

分体式钢箱梁是一种桥梁的主梁形式，这类主梁在浙江舟山连岛工程西堠门大桥、香港昂船洲大桥、青岛海湾大桥大沽河航道桥等多座桥梁中采用。风洞试验结果显示，采用分体式钢箱梁作为主梁的桥梁，在一定条件下主梁可能会发生较大振幅的涡激振动，需要采取有效措施进行振动控制。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.

桥梁主梁的涡激振动是在一定条件下，由于气流通过主梁时所产生的有规律性的旋涡脱落引起的振动现象。桥梁主梁的涡激振动将会给桥梁结构安全和行车舒适性造成重要威胁，必须采取一定的措施进行有效控制。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 conditions. The vortex-induced vibration of the bridge girder will pose an important threat to the safety of the bridge structure and the driving comfort, and certain measures must be taken to effectively control it.

桥梁主梁涡激振动的控制措施主要有机械阻尼措施和气动控制措施。机械阻尼措施如调谐质量阻尼器、调谐液体阻尼器等，气动控制措施如导流板、扰流板、风嘴等。目前采用分体式钢箱梁作为主梁的桥梁，通常采用导流板来控制主梁的涡激振动，如浙江舟山连岛工程西堠门大桥、香港昂船洲大桥等。The control measures of vortex-induced vibration of bridge girder mainly include mechanical damping measures and pneumatic control measures. Mechanical damping measures such as tuned mass dampers, tuned liquid dampers, etc., pneumatic control measures such as deflectors, spoilers, nozzles, etc. At present, bridges that use split steel box girders as the main girder usually use deflectors to control the vortex-induced vibration of the main girder, such as the Xihoumen Bridge of the Zhoushan Liandao Project in Zhejiang and the Stonecutters Island Bridge in Hong Kong.

研究表明，对于采用分体式钢箱梁作为主梁的桥梁，一般情况下导流板的制振效果比较好。但对于某些采用分体式钢箱梁的桥梁，导流板的控制效果不明显，为了将涡激振动的振幅控制在可接受的范围之内，导流板的尺寸需要做得比较大，这样将会导致结构构造复杂，且经济费用较高。Research shows that for bridges using split steel box girders as the main girder, the vibration damping effect of the deflector is generally better. 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.

发明内容 Contents of the invention

本发明的目的是提供一种控制分体式钢箱梁桥梁的主梁涡激振动的格栅结构，该格栅结构是一种气动控制措施，能够有效控制分体式钢箱梁的涡激振动的振幅。The purpose of the present invention is to provide a grid structure for controlling the vortex-induced vibration of the main girder of the split steel box girder bridge. The grid structure is an aerodynamic control measure that can effectively control the vortex-induced vibration of the split steel box girder amplitude.

为了实现上述目的，本发明的技术解决方案是：In order to achieve the above object, the technical solution of the present invention is:

一种控制分体式钢箱梁桥梁的主梁涡激振动的格栅结构，包括格栅和格栅支撑架；其格栅固接在格栅支撑架的上表面，位于分体式钢箱梁的中央开槽的顶部；格栅结构的顶面与分体式钢箱梁的顶面平齐，其周缘固定在分体式钢箱梁的钢箱梁和连接横梁侧面；格栅结构沿桥梁的纵向布置，在分体式钢箱梁的连接横梁处断开，纵向布置区域的长度为桥梁主跨长度的1/2～1倍；格栅结构的透空率为40％～80％。A grid structure for controlling the vortex-induced vibration of the main beam of a split steel box girder bridge, including a grid and a grid support frame; the grid is fixed on the upper surface of the grid support frame, and is located on the The top of the central slot; the top surface of the grid structure is flush with the top surface of the split steel box girder, and its periphery is fixed on the side of the steel box girder and the connecting beam of the split steel box girder; the grid structure is arranged along the longitudinal direction of the bridge , is disconnected at the connecting beam of the split steel box girder, and the length of the longitudinal arrangement area is 1/2 to 1 times the length of the main span of the bridge; the air permeability of the grid structure is 40% to 80%.

所述的格栅结构，其格栅的材料为钢材或玻璃纤维增强塑料；格栅支撑架的材料为钢材。For the grid structure, the material of the grid is steel or glass fiber reinforced plastic; the material of the grid support frame is steel.

所述的格栅结构，其所述格栅与格栅支撑架之间通过焊接或栓接进行牢固连接；格栅结构与分体式钢箱梁的钢箱梁和连接横梁侧面之间通过焊接或栓接进行牢固连接。The grid structure, the grid and the grid support frame are firmly connected by welding or bolting; the grid structure and the steel box girder of the split steel box girder and the side of the connecting beam are welded or Bolted for a secure connection.

所述的格栅结构，其所述格栅的平面布置形式为“井”字形；格栅支撑架的平面布置形式为“井”字形或“米”字形，其横截面形式为工字形或矩形。The grid structure, the plane layout form of the grid is "well" shape; the plane layout form of the grid support frame is "well" shape or "m" shape, and its cross-sectional form is I-shaped or rectangular .

本发明针对现有分体式钢箱梁桥梁的主梁涡激振动控制措施中存在的一些不足，通过在分体式钢箱梁的中央开槽处安装格栅结构来改变分体式钢箱梁的空气绕流形态，抑制空气流过分体式钢箱梁时所产生的旋涡，从而有效控制分体式钢箱梁的涡激振动，而且结构简单、安装方便和经济性能好。The present invention aims at some deficiencies in the vortex-induced vibration control measures of the main girder of the existing split steel box girder bridge, and changes the air pressure of the split steel box girder by installing a grid structure at the central slot of the split steel box girder. The flow around form suppresses the vortex generated when the air flows through the split steel box girder, thereby effectively controlling the vortex-induced vibration of the split steel box girder, and has a simple structure, convenient installation and good economic performance.

附图说明 Description of drawings

图1本发明控制分体式钢箱梁桥梁的主梁涡激振动的格栅结构示意图；Fig. 1 present invention controls the grid structure schematic diagram of the main girder vortex-induced vibration of split type steel box girder bridge;

图2本发明控制分体式钢箱梁桥梁的主梁涡激振动的格栅结构沿桥梁纵向布置示意图；Fig. 2 present invention controls the grid structure of the vortex-induced vibration of the main girder of the split steel box girder bridge along the vertical layout schematic diagram of the bridge;

图3a、图3b为本发明格栅结构的格栅与格栅支撑架之间相互关系示意图；Figure 3a and Figure 3b are schematic diagrams of the relationship between the grid of the grid structure of the present invention and the grid support frame;

图4本发明的“井”字形格栅支撑架结构示意图；Fig. 4 is a structural schematic diagram of a "well" shaped grid support frame of the present invention;

图5本发明的“米”字形格栅支撑架结构示意图。Fig. 5 is a schematic structural diagram of the "m"-shaped grid support frame of the present invention.

具体实施方式 Detailed ways

下面结合附图对本发明作进一步的描述。The present invention will be further described below in conjunction with the accompanying drawings.

见图1～5，为本发明控制分体式钢箱梁桥梁的主梁涡激振动的格栅结构，以控制分体式钢箱梁桥梁主梁涡激振动的振幅。其中：格栅结构1；格栅2；格栅支撑架3；分体式钢箱梁4；中央开槽5；钢箱梁6；连接横梁7；桥梁8；格栅结构的长度A；格栅结构的宽度B；格栅的高度h1；格栅支撑架的高度h2；格栅结构布置区域长度L1；桥梁主跨长度L。See Figures 1 to 5, which are grid structures 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 The width B of the structure; the height h 1 of the grid; the height h 2 of the grid support frame; the length L1 of the layout area of the grid structure; the length L of the main span of the bridge.

格栅结构1包括格栅2和格栅支撑架3。格栅2的高度为h1(h1＝0.04～0.4m)、透空率为30％～90％，其材料可为钢材、玻璃纤维增强塑料(Fiberglass-Reinforced Plastics)或其它复合材料。格栅支撑架3的高度为h2(h2＝0.4～2.0m)，其平面布置形式可为“井”字形或“米”字形，其横截面形式可为工字形或矩形，其材料为钢材。格栅2密贴在格栅支撑架3的上方，二者之间通过焊接或栓接进行牢固连接。The grid structure 1 includes a grid 2 and a grid support frame 3 . The height of the 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 Plastics) or other composite materials. The height of the grid support frame 3 is h 2 (h 2 =0.4~2.0m), its plane layout can be in the shape of "well" or "meter", its cross-section can be I-shaped or rectangular, and its material is steel. The grid 2 is closely attached to the top of the grid support frame 3, and the two are firmly connected by welding or bolting.

格栅结构1的长度为A、宽度为B、透空率为40％～80％，它安装在分体式钢箱梁4的中央开槽5的顶部，其顶面与分体式钢箱梁4的顶面平齐，其周缘固定在分体式钢箱梁的钢箱梁6和连接横梁7上。格栅结构1沿桥梁8的纵向布置，在分体式钢箱梁4的连接横梁7处断开，布置区域长度L1为桥梁8主跨长度L的1/2～1倍。The grid structure 1 has a length of A, a width of B, and a permeability of 40% to 80%. It is installed on the top of the central slot 5 of the split steel box girder 4. The top surface is flush, and its periphery is fixed on the steel box girder 6 and the connecting beam 7 of the split steel box girder. The grid structure 1 is arranged along the longitudinal direction of the bridge 8, and is disconnected at the connecting beam 7 of the split steel box girder 4, and the length L1 of the arrangement area is 1/2 to 1 times the length L of the main span of the bridge 8.

本发明能够抑制空气流过分体式钢箱梁时所产生的旋涡，从而有效控制分体式钢箱梁的涡激振动，而且结构简单、安装方便和经济性能好。The invention can suppress the vortex generated when the air flows through the split steel box girder, thereby effectively controlling the vortex-induced vibration of the split steel box girder, and has simple structure, convenient installation and good economic performance.

Claims (4)

1.一种控制分体式钢箱梁桥梁的主梁涡激振动的格栅结构(1)，包括格栅(2)和格栅支撑架(3)；其特征在于：格栅(2)固接在格栅支撑架(3)的上表面，位于分体式钢箱梁(4)的中央开槽(5)的顶部；格栅结构(1)的顶面与分体式钢箱梁(4)的顶面平齐，其周缘固定在分体式钢箱梁的钢箱梁(6)和连接横梁(7)侧面；格栅结构(1)沿桥梁(8)的纵向布置，在分体式钢箱梁(4)的连接横梁(7)处断开，纵向布置区域的长度为桥梁(8)主跨长度的1/2～1倍；格栅结构(1)的透空率为40％～80％。1. A grid structure (1) for controlling the vortex-induced vibration of the main girder of a split-type steel box girder bridge, comprising a grid (2) and a grid support frame (3); it is characterized in that: the grid (2) is fixed Connected to the upper surface of the grid support frame (3), located on the top of the central slot (5) of the split steel box girder (4); the top surface of the grid structure (1) and the split steel box girder (4) The top surface of the bridge is even, and its periphery is fixed on the side of the steel box girder (6) and the connecting beam (7) of the split steel box girder; the grid structure (1) is arranged along the longitudinal direction of the bridge (8), The connecting beam (7) of the beam (4) is disconnected, and the length of the longitudinal arrangement area is 1/2 to 1 times the length of the main span of the bridge (8); the air permeability of the grid structure (1) is 40% to 80% %. 2.根据权利要求1所述的格栅结构(1)，其特征在于：格栅(2)的材料为钢材或玻璃纤维增强塑料；格栅支撑架(3)的材料为钢材。2. The grid structure (1) according to claim 1, characterized in that: the material of the grid (2) is steel or glass fiber reinforced plastic; the material of the grid support frame (3) is steel. 3.根据权利要求1所述的格栅结构(1)，其特征在于：所述格栅(2)与格栅支撑架(3)之间通过焊接或栓接进行牢固连接；格栅结构(1)与分体式钢箱梁的钢箱梁(6)和连接横梁(7)侧面之间通过焊接或栓接进行牢固连接。3. The grid structure (1) according to claim 1, characterized in that: the grid (2) and the grid support frame (3) are firmly connected by welding or bolting; the grid structure ( 1) It is firmly connected with the side of the steel box girder (6) and the connecting beam (7) of the split steel box girder by welding or bolting. 4.根据权利要求1所述的格栅结构(1)，其特征在于：所述格栅(2)的平面布置形式为“井”字形；格栅支撑架(3)的平面布置形式为“井”字形或“米”字形，其横截面形式为工字形或矩形。4. The grid structure (1) according to claim 1, characterized in that: the plane layout of the grid (2) is in the shape of a "well"; the plane layout of the grid support frame (3) is " Well-shaped or "m"-shaped, and its cross-sectional form is I-shaped or rectangular.
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