CN112853927A - Heave plate-spring combined control device for inhibiting flutter of marine long-span bridge - Google Patents
Heave plate-spring combined control device for inhibiting flutter of marine long-span bridge Download PDFInfo
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- CN112853927A CN112853927A CN202110038975.3A CN202110038975A CN112853927A CN 112853927 A CN112853927 A CN 112853927A CN 202110038975 A CN202110038975 A CN 202110038975A CN 112853927 A CN112853927 A CN 112853927A
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- heave plate
- bridge
- plate
- spring
- flutter
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D19/00—Structural or constructional details of bridges
Abstract
The invention belongs to the technical field of wind-induced vibration control of bridges, and provides a heave plate-spring combined control device for inhibiting flutter of a large-span bridge at sea. When the bridge is subjected to wind-induced large-amplitude vibration, the heave plate in water can be driven to move upwards, huge additional damping force and additional mass generated by a water body act on the heave plate, and meanwhile, the heave plate is subjected to vertical downward pulling force of the parallel spring set, so that the energy consumption in the rising process of the bridge can be increased, the falling speed of the heave plate can be increased, and the bridge is close to synchronization with the falling of the bridge. Compared with the prior art without a spring device, the energy-consuming device can fully exert the dual effects of consuming energy by the spring and accelerating the descent of the heave plate, thereby more efficiently inhibiting the flutter of the bridge or greatly reducing the size of the heave plate and the construction cost. The advantages of the invention are as follows: simple, practical, economical and efficient.
Description
Technical Field
The invention belongs to the technical field of wind-induced vibration control of bridges, and relates to a heave plate-spring combined control device for efficiently inhibiting flutter of a marine long-span bridge.
Background
A large number of long-span bridges have been built at sea worldwide, but the wind speed and the duration at sea bring greater challenges to the wind resistance safety of the bridges, and the wind load is often the control design load. Flutter is a wind-induced vibration phenomenon which is the most serious damage to a bridge structure, and a large-amplitude limit ring and divergent flutter must be strictly avoided in the wind-resistant design of a long-span bridge. The flutter control measures mainly comprise pneumatic measures, structural measures and mechanical measures. Aiming at the defects of the traditional control measures for the flutter of the large-span bridge, the inventor has already provided a heave plate control device suitable for inhibiting the flutter of the large-span sea-crossing (cross a river or a part of deep water lake) bridge, namely, a heave plate immersed in water is suspended below the bridge, and the aim of inhibiting the large-amplitude flutter of the bridge is achieved by means of the huge water resistance of the heave plate. In order to reduce the construction cost of the heave plate and reduce the influence on the load of the bridge, the mass of the heave plate is generally small. However, the device still has the following disadvantages: on one hand, when the heave plate rises, the self weight of the heave plate consumes less energy; on the other hand, the falling speed of the heave plate is lower and lags behind the falling of the main beam, so that the resistance acting interval of the heave plate when the main beam rises in the next period is reduced, and the control efficiency is not high. In order to overcome the defects, the invention provides a heave plate-spring combined control measure which is formed by connecting tension springs with various specifications and one ends fixed on the seabed at the bottom of a heave plate. The heave plate control device has the advantages that on one hand, the resistance of the heave plate during rising is increased, on the other hand, the descending speed of the heave plate during downward movement of the bridge is increased, so that the motions of the heave plate and the bridge are as close to synchronization as possible, the vibration suppression effect of the heave plate control device can be obviously improved, and the heave plate control device has relative advantages and characteristics.
Disclosure of Invention
The invention aims to solve the technical problem that the flutter control of a large-span sea-crossing (river-crossing or partial deep water lake) bridge is required, and provides a heave plate-spring combined control device which is suspended below the bridge and immersed in water. When the main beam moves upwards, the heave plate is driven to move upwards, the water body provides very large downward additional damping and additional mass force for the heave plate, the spring at the lower part of the heave plate provides downward pulling force, and the vibration energy of the main beam is consumed; when the main beam moves downwards, the heave plate moves downwards quickly under the tension of the multi-stage springs, the downward movement speed of the heave plate is as close to synchronization as possible with the downward movement speed of the main beam, then the main beam moves in the next period, and the steps are repeated, so that the flutter is effectively inhibited, or the flutter critical wind speed and the wind resistance safety are improved greatly. The reason why a multi-stage spring is used instead of a single or single-stage spring is as follows: when the amplitude is small, the heave plate can be basically close to synchronization with the main beam when descending without or with small spring tension, and at the moment, only the spring with small tension and rigidity is needed to play a role; when the amplitude is larger, more spring tension is needed to consume more energy, and the heave plate descends faster. Therefore, a plurality of stages of springs can be arranged, when the amplitudes respectively reach the designated values, the corresponding springs start to work, otherwise, the springs are in a loose and non-stressed working state.
The technical scheme of the invention is as follows:
a heave plate-spring combined control device for inhibiting the flutter of a cross-sea bridge comprises a heave plate 1, a first rope 2, a parallel spring group 3, a second rope 4 and a gravity block 5; the heave plate 1 can be generally formed by splicing a galvanized metal sheet (steel plate or aluminum plate and the like) and a stiffening rib or a truss system, so that the self weight and the engineering cost of the heave plate 1 are reduced as much as possible under the condition that the heave plate 1 has enough strength and rigidity; the upper end of a first rope 2 with enough strength and rigidity is connected with the bottom of the main beam, and the lower end of the first rope is connected with a heave plate 1; the upper end of the parallel spring group 3 is connected with the bottom of the heave plate 1 through a second rope 4 or connected with the lower end of the first rope 2, and the lower part is connected with a water bottom gravity block 5. When the bridge is in a non-working state, the rope 2 can be retracted through a winch or other equipment to enable the heave plate 1 to be close to and fixed on the bottom plate of the main beam, and the appearance and the attractiveness of the bridge are not affected. The parallel spring package 3 together with the second rope 4 can now be temporarily (with a low weight and negligible load effect on the main girder) fixed under the heave plate 1 and can also be installed again when necessary. The gravity block 5 can be a reinforced concrete block, the volume of which is determined according to the parameters of the size of the heave plate, the number of spring suspension points, the tension and the like, and is generally 20-50m3The requirements can be met.The device can be permanently placed at a designated position, and can also be temporarily placed by ship transportation according to needs. According to weather forecast, when strong wind comes or obvious vortex-induced vibration is observed on site, the heave plate 1 is lowered and immersed in water to a sufficient depth; in a working state, when the bridge moves upwards, the additional mass and the additional damping (namely resistance) provided by the water body to the heave plate 1 and the elastic force of the deformation of the parallel spring set 3 can inhibit the upward movement of the bridge; when the bridge moves downwards, the heave plate 1 moves downwards under the action of self weight, buoyancy of water and spring tension, so that the first rope 2 is prevented from being loosened for a long time when the girder ascends in the next period, and a better control effect is ensured.
The stress and the movement of the combined control device can be adjusted by the combined control device system through adjusting the shape, the size and the immersion depth of the heave plate 1, the number, the rigidity, the length and the tension of the springs of each stage of the parallel spring group 3 and the like.
The heave plate 1 can adopt a structural form that a square, a regular hexagon or a circular metal plate with a plane or a concave surface is provided with a longitudinal and transverse stiffening rib or a truss system, or adopts a corrugated steel plate, and the rigidity can be obviously increased compared with a flat plate with the same thickness, so that the construction cost can be greatly reduced.
The size, the number and the arrangement mode of the heave plates 1 along the bridge span are set according to the actual vibration suppression requirement, in order to ensure the best control effect, the heave plates are generally arranged at the positions where the larger displacement can occur, such as the middle cross section of the main span of the bridge structure, two 1/4 cross sections and the like, and two identical heave plate-spring combined control devices are transversely and symmetrically arranged at the positions so as to simultaneously meet the requirements of controlling the vertical bending and torsional vibration of the bridge.
The first rope 2 should have sufficient strength and rigidity to have a small elongation in the working state; the upper part of the bridge girder can be connected with a bridge structure through equipment such as a winch and the like, and the combined control device can be received to the bottom of the bridge girder in a non-working state, so that the navigation and the attractiveness of the bridge girder are not influenced; the first rope 2 has a sufficient length to ensure that the heave plate 1 can be submerged in the water to a sufficient depth in the operating state.
The parallel spring group 3 is composed of a plurality of groups of springs with different rigidity, length and initial tension, when the upward movement displacement of the heave plate 1 is small (the main beam generates small-amplitude vibration), only the short spring with the small rigidity is in a tensioning working state, and when the upward movement displacement of the heave plate is large (the main beam generates large-amplitude vibration), more groups of springs play a role in a grading way to jointly inhibit the vibration of the bridge. When the bridge girder begins to move downwards, the parallel spring group 3 increases the descending speed of the heave plate 1, after the bridge girder descends for a certain distance, only the short spring with small rigidity has elastic force, and the long spring with large rigidity does not provide pulling force any more, so that the phenomenon that the descending speed of the heave plate 1 is greater than the descending speed of the bridge girder, and the vibration suppression effect is deteriorated is effectively avoided.
The number, the rigidity and the length of each level of spring of the parallel spring group 3 are determined according to the vibration characteristic of the bridge.
The second rope 4 has sufficient strength and rigidity.
The gravity block 5 has enough weight, can not be pulled up or slide in the working process of the control system, can adopt a reinforced concrete block, and is simple, convenient, economic and practical.
The invention has the beneficial effects that: (1) compared with the heave plate control device without the parallel spring group, the heave plate-spring combined control device for inhibiting the flutter of the cross-sea bridge has higher control efficiency; (2) under the condition of ensuring the same vibration suppression effect, the heave plate control device with the parallel spring group provided by the invention can greatly reduce the size of the heave plate and has lower engineering cost. (3) The device is simple, convenient to operate and good in flutter control effect.
Drawings
Fig. 1 is a structural diagram of a heave plate-spring combined control device for suppressing flutter of an offshore large-span bridge.
In the figure: 1 a heave plate; 2 a first rope; 3, connecting spring groups in parallel; 4 a second rope; 5 gravity block.
Detailed Description
The following detailed description of the embodiments of the present invention is provided in conjunction with the drawings and the technical solutions, but the embodiments of the present invention are not limited thereto:
as shown in fig. 1, the heave plate-spring combined control device for inhibiting the flutter of the offshore large-span bridge comprises a heave plate 1, a first rope 2, a parallel spring group 3, a second rope 4 and a gravity block 5; the heave plate 1 has enough strength and rigidity, and can be generally manufactured by splicing a stiffening rib or a truss system with a galvanized metal sheet (a steel plate, an aluminum plate and the like), so that the self weight and the engineering cost of the heave plate 1 are reduced as much as possible under the condition that the heave plate 1 has enough strength and rigidity; the lower end of a first rope 2 with enough strength, rigidity and length is connected with a heave plate 1, and the upper end is connected to the bottom of a main beam through equipment such as a winch and the like; the parallel spring group 3 is connected with the bottom of the heave plate 1 through the upper end of a second rope 4, and the lower end of the parallel spring group is connected with a gravity block 5 at the bottom of the water; the parallel spring group 3 has the main functions of increasing the resistance of the heave plate 1 in the rising process, improving energy consumption, accelerating the descending speed of the heave plate 1 to be close to synchronous with the descending of the main beam as far as possible, and ensuring the control efficiency of the next period; in a non-working state, the heave plate 1 is closely fixed on a bottom plate of a main beam, and before threatening strong wind comes, a winch and other equipment drive a first rope 2 to lower the heave plate 1 to be immersed in water to a sufficient depth; the heave plate 1 in the water can generate additional mass and additional damping under the driving of the bridge. Compared with the prior art without a spring device, the energy-consuming device can fully exert the dual effects of consuming energy by the spring and accelerating the descent of the heave plate, thereby more efficiently inhibiting the flutter of the bridge or greatly reducing the size of the heave plate and the construction cost. The left side and the right side of the large displacement position of the main span middle section and the two 1/4 sections can be respectively provided with a heave plate-spring combined control device, and the wind-induced vertical bending and torsional vibration can be controlled.
The heave plate-spring combined control device for inhibiting the flutter of the cross-sea bridge, which is provided by the invention, can simultaneously meet the flutter control requirements of the vertical direction and the torsion of the bridge, and is economical, practical and efficient.
The foregoing is merely exemplary of the preferred embodiments of the present invention and is not intended to limit the invention in any manner. Any equivalent alterations, modifications or improvements, etc. made to the above examples by those skilled in the art using the teachings of the present invention, are still within the scope of the present invention.
Claims (8)
1. A heave plate-spring combined control device for inhibiting the flutter of an offshore large-span bridge is characterized by comprising a heave plate (1), a first rope (2), a parallel spring group (3), a second rope (4) and a gravity block (5); the heave plate (1) is formed by splicing a stiffening rib or a truss and a galvanized metal sheet or is in a corrugated metal sheet structure; the lower end of the first rope (2) is connected to the upper surface of the heave plate (1), and the upper end of the first rope is connected to the bottom of the main beam; the parallel spring group (3) is connected with the lower surface of the heave plate (1) through the upper end of a second rope (4), and the lower end of the parallel spring group (3) is connected with a gravity block (5) at the bottom of the water; in a non-working state, the heave plate (1) is closely fixed on the bottom plate of the main beam, and the heave plate (1) is lowered and immersed in water to a sufficient depth by driving the first rope (2); temporarily install parallelly connected spring assembly (3), second rope (4) and gravity piece (5), the board (1) that sways that hangs down in aqueous produces additional mass and additional damping force under the bridge drives, under dead weight and parallelly connected spring assembly (3) pulling force effect, high-efficient suppression bridge vibration.
2. The heave plate-spring combined control device for inhibiting the flutter of the offshore large-span bridge according to claim 1, wherein the thickness of the heave plate (1) is not more than 10cm, the size, the number and the arrangement mode along the bridge span are set according to actual engineering requirements, the heave plate-spring combined control device is arranged at a position where the bridge structure is likely to generate large displacement, and two identical heave plate-spring combined control devices for inhibiting the flutter of the offshore large-span bridge are transversely and symmetrically arranged at the position.
3. Combined heave plate-spring control device for damping flutter of an offshore large span bridge according to claim 1 or 2, wherein the area of the single heave plate (1) is 50-150m2Within the scope of this, it is a square, regular hexagonal or circular metal sheet, planar or concave.
4. The heave plate-spring combination control device for inhibiting the flutter of the offshore large-span bridge according to claim 1 or 2, wherein the parallel spring group (4) consists of springs with different rigidities, strengths, lengths and initial tension, and the quantity, the rigidity and the length of each stage of the springs are determined according to the vibration characteristics of the bridge.
5. The heave plate-spring combination control device for suppressing the flutter of the offshore large-span bridge according to claim 3, wherein the parallel spring group (4) is composed of springs with different rigidities, strengths, lengths and initial tension, and the quantity, the rigidity and the length of each stage of the springs are determined according to the vibration characteristics of the bridge.
6. The heave plate-spring combination control device for suppressing the flutter of the offshore large-span bridge according to claim 1, 2 or 5, wherein the metal thin plate is a steel plate or an aluminum plate.
7. The heave plate-spring combination control device for suppressing flutter of an offshore large-span bridge according to claim 3, wherein the metal sheet is a steel plate or an aluminum plate.
8. The heave plate-spring combination control device for suppressing flutter of an offshore large-span bridge according to claim 4, wherein the metal thin plate is a steel plate or an aluminum plate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110038975.3A CN112853927A (en) | 2021-01-12 | 2021-01-12 | Heave plate-spring combined control device for inhibiting flutter of marine long-span bridge |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110038975.3A CN112853927A (en) | 2021-01-12 | 2021-01-12 | Heave plate-spring combined control device for inhibiting flutter of marine long-span bridge |
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| Publication Number | Publication Date |
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| CN112853927A true CN112853927A (en) | 2021-05-28 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202110038975.3A Withdrawn CN112853927A (en) | 2021-01-12 | 2021-01-12 | Heave plate-spring combined control device for inhibiting flutter of marine long-span bridge |
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| CN (1) | CN112853927A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113152260A (en) * | 2021-05-18 | 2021-07-23 | 大连理工大学 | Spring-flexible mesh cloth tuning device for inhibiting vortex-induced vibration of bridge |
| WO2022252101A1 (en) * | 2021-06-01 | 2022-12-08 | 大连理工大学 | Semi-active vibration absorption and energy dissipation control system for restraining vortex-induced vibration of bridge |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH1129906A (en) * | 1997-07-10 | 1999-02-02 | Nkk Corp | Vibration control method of suspension bridge girder, and the suspension bridge |
| CN101260646A (en) * | 2008-04-14 | 2008-09-10 | 李有为 | Great span bridge lower damper system for wind and water resistance |
| CN104890830A (en) * | 2015-04-30 | 2015-09-09 | 大连理工大学 | Control system for stabilizing and reducing swing through tuning heaving plate of deep-water dynamic-positioning semi-submersible platform |
| CN105756848A (en) * | 2016-02-22 | 2016-07-13 | 江苏科技大学 | Tuning permeable vibration-damping power generation device for ultra-large floating structure |
| CN112179610A (en) * | 2020-10-30 | 2021-01-05 | 长安大学 | Eddy current damper for segment model test, vibration device and experimental method |
-
2021
- 2021-01-12 CN CN202110038975.3A patent/CN112853927A/en not_active Withdrawn
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH1129906A (en) * | 1997-07-10 | 1999-02-02 | Nkk Corp | Vibration control method of suspension bridge girder, and the suspension bridge |
| CN101260646A (en) * | 2008-04-14 | 2008-09-10 | 李有为 | Great span bridge lower damper system for wind and water resistance |
| CN104890830A (en) * | 2015-04-30 | 2015-09-09 | 大连理工大学 | Control system for stabilizing and reducing swing through tuning heaving plate of deep-water dynamic-positioning semi-submersible platform |
| CN105756848A (en) * | 2016-02-22 | 2016-07-13 | 江苏科技大学 | Tuning permeable vibration-damping power generation device for ultra-large floating structure |
| CN112179610A (en) * | 2020-10-30 | 2021-01-05 | 长安大学 | Eddy current damper for segment model test, vibration device and experimental method |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113152260A (en) * | 2021-05-18 | 2021-07-23 | 大连理工大学 | Spring-flexible mesh cloth tuning device for inhibiting vortex-induced vibration of bridge |
| CN113152260B (en) * | 2021-05-18 | 2023-02-17 | 大连理工大学 | Spring-flexible mesh cloth tuning device for inhibiting vortex-induced vibration of bridge |
| WO2022252101A1 (en) * | 2021-06-01 | 2022-12-08 | 大连理工大学 | Semi-active vibration absorption and energy dissipation control system for restraining vortex-induced vibration of bridge |
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Application publication date: 20210528 |