CN113322783B - Sound barrier device and method for inhibiting vortex-induced resonance of girder of long-span bridge - Google Patents
Sound barrier device and method for inhibiting vortex-induced resonance of girder of long-span bridge Download PDFInfo
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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
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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
- E01D19/10—Railings; Protectors against smoke or gases, e.g. of locomotives; Maintenance travellers; Fastening of pipes or cables to bridges
- E01D19/103—Parapets, railings ; Guard barriers or road-bridges
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01F—ADDITIONAL WORK, SUCH AS EQUIPPING ROADS OR THE CONSTRUCTION OF PLATFORMS, HELICOPTER LANDING STAGES, SIGNS, SNOW FENCES, OR THE LIKE
- E01F8/00—Arrangements for absorbing or reflecting air-transmitted noise from road or railway traffic
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- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
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Abstract
The application provides a sound barrier device and a method for restraining vortex-induced resonance of a main girder of a large-span bridge. The sound barrier device (which can be understood as a broken line type sound barrier) changes the aerodynamic force borne by the section of the main beam and weakens the strength of vortex shedding in the wake area of the section of the main beam, thereby successfully inhibiting the vortex vibration response of the main beam and solving the technical problem that the vortex vibration can occur on the section of the main beam adopting the linear type sound barrier. And, the sound barrier device that this scheme provided except that make an uproar and environmental protection function, can also restrain the sectional vortex-induced resonance of girder. And the sound barrier device of the scheme does not need to add extra pneumatic control measures, and is more economical and applicable.
Description
Technical Field
The application relates to the technical field of bridge engineering, in particular to a sound barrier device and method for inhibiting vortex-induced resonance of a girder of a large-span bridge.
Background
Noise is one of the biggest problems affecting people's modern life. In engineering practice, in order to reduce the influence of urban traffic noise on the surrounding environment, sound barriers are generally arranged on two sides (or one side) of an urban road or an overhead bridge, and research and application of traditional sound barriers are mature.
With the further advance of ecological civilization construction, the requirements on environmental protection in traffic infrastructure construction are more strict, and the influence of traffic noise on surrounding organisms must be considered when a part of large-span bridges pass through ecological sensitive areas. If the deep mao railway reaches the mao section and passes through the bird hall in the new meeting area of Guangdong Jiangmen, the totally-closed sound barrier is adopted to reduce the train wheel track noise, thereby reducing the influence on the bird hall.
The large-span bridge has the characteristics of light structure dead weight, low damping ratio, low frequency and the like, when the bridge span is large, the structure self-oscillation frequency is low, the effect of wind on the bridge structure is obvious, and wind-induced vibration of the bridge structure, such as flutter, vortex oscillation, galloping or buffeting response and the like, can be caused. When a large-span bridge passes through an ecological protection area, in order to reduce the influence of traffic noise on organisms in the ecological protection area as much as possible, a sound barrier needs to be installed.
Traditional sound barriers are installed on a large-span bridge, and the pneumatic appearance of the section of a main beam can be changed, so that the main beam is obviously subjected to wind-induced vibration.
Disclosure of Invention
An object of the embodiment of the application is to provide a sound barrier device and a method for suppressing vortex-induced resonance of a girder of a large-span bridge, so as to simultaneously meet the requirements of reducing noise and controlling vortex vibration.
In order to achieve the above object, embodiments of the present application are implemented as follows:
in a first aspect, the embodiment of the present application provides a sound barrier device for suppressing vortex-induced resonance of a girder of a large-span bridge, the large-span bridge extends along a first direction, and a handrail kerb is laid on a wing end of the girder in the first direction in an extending manner, the handrail kerb has a first side and a second side which are opposite to each other, the first side is inward of the large-span bridge, the second side is outward of the large-span bridge, the handrail kerb is close to a position on the first side, and the first direction is extended to be provided with an anti-collision guardrail, the sound barrier device includes: the sound barrier base is arranged on the railing base stone in an extending mode along the first direction and is connected with the anti-collision guardrail; the sound barrier body is arranged on the sound barrier base in a manner of extending along the first direction and is close to the position of the second side, and the sound barrier body is not perpendicular to the angle between the railing bedstones and inclines to the outer side of the large-span bridge.
In the embodiment of the application, the sound barrier device (which can be understood as a broken line type sound barrier) changes the aerodynamic force applied to the section of the main beam, and weakens the strength of vortex shedding in the wake area of the section of the main beam, so that the vortex vibration response of the main beam is successfully inhibited, and the technical problem that the vortex vibration occurs on the section of the main beam adopting the linear type sound barrier is solved. In addition, the sound barrier device (broken line type sound barrier) provided by the scheme can inhibit vortex-induced resonance of the section of the main beam besides the noise reduction and environmental protection functions. And when vortex vibration occurs on the section of the main beam of the traditional linear sound barrier, additional pneumatic measures such as a guide plate, a flow inhibiting plate, a pneumatic grating and the like need to be installed. The sound barrier device (the broken line type sound barrier) in the scheme does not need to add extra pneumatic control measures, and is more economical and applicable.
With reference to the first aspect, in a first possible implementation manner of the first aspect, the sound barrier apparatus further includes a connecting member, and the connecting member is connected between the sound barrier body and the crash barrier.
In this implementation, the connecting piece of sound barrier device is connected between sound barrier body and anticollision barrier, can guarantee the stability and the reliability of sound barrier device installation.
With reference to the first possible implementation manner of the first aspect, in a second possible implementation manner of the first aspect, the sound barrier device further includes sound barrier columns, the sound barrier columns are arranged at the top end of the sound barrier body at intervals in a manner of extending along the first direction, an obtuse angle is formed between each sound barrier column and the sound barrier body, and the sound barrier columns are inclined towards the inner side of the large-span bridge.
In this implementation, set up the sound barrier stand through the interval, be favorable to utilizing the sound barrier stand to consolidate the connection of sound barrier body.
With reference to the second possible implementation manner of the first aspect, in a third possible implementation manner of the first aspect, for one sound barrier column, a stiffening rib is arranged between the sound barrier column and the included angle of the sound barrier body, the connecting member includes a first connecting rod and a second connecting rod, the first connecting rod is connected between the stiffening rib and the anti-collision guardrail, and the second connecting rod is connected between the sound barrier body and the anti-collision guardrail.
In this implementation, set up the stiffening rib between the contained angle of sound barrier stand and sound barrier body, recycle the head rod and connect between stiffening rib and anticollision barrier, utilize the second connecting rod to connect between sound barrier body and anticollision barrier. Therefore, the stability of the sound barrier body can be effectively enhanced, and the quality of the sound barrier device installed on the large-span bridge is guaranteed.
With reference to the third possible implementation manner of the first aspect, in a fourth possible implementation manner of the first aspect, the anti-collision guardrail includes guardrail posts and railings, and the plurality of guardrail posts are arranged on the railing bedrock at intervals in a manner of extending along the first direction, where the guardrail posts are close to the first side; the guardrail posts are arranged on the side walls of the plurality of guardrail posts facing the inner side of the large-span bridge in an extending manner along the first direction; correspondingly, the first connecting rod is connected between the stiffening rib and the guardrail upright post, and the second connecting rod is connected between the sound barrier body and the guardrail upright post.
With reference to the third possible implementation manner of the first aspect, in a fifth possible implementation manner of the first aspect, an included angle between the sound barrier pillar and the sound barrier body is 120 °.
In the implementation mode, the included angle between the sound barrier upright post and the sound barrier body is set to be 120 degrees, so that the reinforcement effect of the sound barrier upright post on the sound barrier body can be better exerted.
With reference to the first aspect, in a sixth possible implementation manner of the first aspect, the sound barrier base has a through hole, and the shape and size of the through hole are consistent with the shape and size of the cross section of the anti-collision guardrail on the railing base stone, and the sound barrier device for inhibiting vortex-induced resonance of the main beam of the long-span bridge is applied to the building process of the long-span bridge.
In this implementation, when the sound barrier device is applied to the construction in-process of large-span bridge, can choose for use the sound barrier base that sets up the through-hole to make the sound barrier body use same base with anticollision barrier at the construction in-process of large-span bridge, guarantee the stability and the quality of sound barrier device installation.
With reference to the first aspect, in a seventh possible implementation manner of the first aspect, the sound barrier base has a semi-enclosed opening, and the size of the semi-enclosed opening is consistent with the size of the cross section of the anti-collision guardrail on the railing kerb, and the sound barrier device for inhibiting vortex-induced resonance of the main beam of the long-span bridge is applied to the building process or the reconstruction process of the long-span bridge.
In the implementation mode, when the sound barrier device is applied to the building process or the reconstruction process of a long-span bridge (mainly the bridge reconstruction process), due to the fact that the anti-collision guardrail of the long-span bridge in the bridge forming state is already built, the sound barrier base with the semi-surrounding type opening is selected, and therefore the sound barrier device can be applied to the bridge reconstruction process, and the stability and the quality of installation of the sound barrier device are guaranteed.
With reference to the first aspect, in an eighth possible implementation manner of the first aspect, an angle between the sound barrier body and the railing kerb is 108 °.
In this implementation, the angle between the sound barrier body and the railing kerb is set to 108 °, so that the effect of the sound barrier device (suppressing the main beam vortex vibration response, suppressing the vortex-induced resonance of the main beam section, etc.) can be maximized.
In a second aspect, an embodiment of the present application provides a sound barrier apparatus testing method for suppressing vortex-induced resonance of a girder of a long-span bridge, which is applied to the sound barrier apparatus for suppressing vortex-induced resonance of a girder of a long-span bridge described in any one of the first aspect or possible implementation manners of the first aspect, where the method includes: analyzing the structural dynamic characteristics of the large-span bridge in the bridge forming state by adopting a finite element modeling method to obtain the natural frequencies of different orders of the full bridge in the bridge forming state; performing a wind tunnel test on a section model of a bridge-forming state section of a two-degree-of-freedom main beam, installing the sound barrier device, and measuring the vertical displacement and torsional displacement response of the main beam of the sound barrier device at wind attack angles of 0 degrees, 3 degrees and 3 degrees, wherein the wind direction is vertical to the section of the main beam, and the damping ratio of the vertical vibration and the torsional vibration of the model in the test process is 0.727%; and measuring the resistance coefficient, the lift coefficient and the moment coefficient of the section of a main beam of the sound barrier device when the section is in a wind attack angle range of-12 degrees, the interval is 1 degree and the test wind speed is 7 m/s.
In order to make the aforementioned objects, features and advantages of the present application more comprehensible, preferred embodiments accompanied with figures are described in detail below.
Drawings
To more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are required to be used in the embodiments of the present application will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present application and therefore should not be considered as limiting the scope, and that those skilled in the art can also obtain other related drawings based on the drawings without inventive efforts.
Fig. 1 is a schematic cross-sectional view of an acoustic barrier apparatus for suppressing vortex-induced resonance of a girder of a long-span bridge according to an embodiment of the present disclosure;
fig. 2 is a schematic front view of an acoustic barrier apparatus for suppressing vortex-induced resonance of a girder of a long-span bridge according to an embodiment of the present application.
Fig. 3 is a schematic diagram of a vertical displacement root variance of a linear sound barrier girder.
Fig. 4 is a schematic diagram of a root variance of torsional displacement of a linear sound barrier main beam.
Fig. 5 is a schematic diagram of a vertical displacement root variance of a broken line type sound barrier main beam.
Fig. 6 is a schematic diagram of the root variance of torsional displacement of a main beam of the broken line type sound barrier.
Fig. 7 is a schematic diagram of the static three-component force coefficient of the broken line type sound barrier main beam section.
Icon: 10-a large-span bridge; 11-main beam wing ends; 12-a railing keystone; 13-anti-collision guardrail; 131-guardrail posts; 132-a rail; 20-a sound barrier means; 21-a sound barrier base; 22-a sound barrier body; 23-a connector; 231-first connecting rod; 232-a second connecting rod; 24-a sound barrier column; 25-stiffeners.
Detailed Description
The technical solutions in the embodiments of the present application will be described below with reference to the drawings in the embodiments of the present application.
Referring to fig. 1 and fig. 2, fig. 1 is a schematic cross-sectional view of a sound barrier apparatus for suppressing vortex-induced resonance of a girder of a long-span bridge according to an embodiment of the present application; fig. 2 is a schematic front view of an acoustic barrier apparatus for suppressing vortex-induced resonance of a girder of a long-span bridge according to an embodiment of the present application.
In this embodiment, the large-span bridge 10 extends along a first direction, a railing foundation 12 is laid on the main beam wing end 11 of the large-span bridge in an extending manner along the first direction, the railing foundation 12 has a first side and a second side which are opposite to each other, the first side faces the inner side of the large-span bridge 10, the second side faces the outer side of the large-span bridge 10, and an anti-collision guardrail 13 is arranged on the railing foundation 12 at a position close to the first side in an extending manner along the first direction.
For example, the crash barrier 13 may include a barrier post 131 and a barrier 132, wherein a plurality of barrier posts 131 are arranged at intervals on the barrier foundation 12 near the first side and extend along the first direction; the balustrade 132 is provided on a side wall of the plurality of guardrail posts 131 facing the inside of the large-span bridge 10, extending in the first direction.
And the sound barrier apparatus 20 may comprise a sound barrier base 21 and a sound barrier body 22.
For example, the sound barrier base 21 may be disposed on the balustrade bedrock 12 extending in the first direction and connected with the crash barrier 13.
For example, the sound barrier body 22 may be disposed on the sound barrier base 21 near the second side in an extending manner along the first direction, and the angle between the sound barrier body 22 and the balustrade bedrock 12 is non-perpendicular and inclined toward the outside of the large-span bridge 10.
In this embodiment, the sound barrier apparatus 20 may further include a connector 23, and the connector 23 is connected between the sound barrier body 22 and the crash barrier 13. This ensures the stability and reliability of the installation of the sound barrier device 20.
In this embodiment, the sound barrier apparatus 20 may further comprise a sound barrier column 24. A plurality of sound barrier pillars 24 may be arranged at the top end of the sound barrier body 22 at intervals extending along the first direction, and the sound barrier pillars 24 and the sound barrier body 22 form an obtuse angle therebetween, and the sound barrier pillars 24 are inclined towards the inside of the large-span bridge 10. The sound barrier uprights 24 are spaced to facilitate the reinforcement of the connection of the sound barrier body 22 by the sound barrier uprights 24.
In the present embodiment, for each sound barrier pillar 24, a stiffening rib 25 is disposed between the angle between the sound barrier pillar 24 and the sound barrier body 22. The connecting member 23 may include a first connecting rod 231 and a second connecting rod 232, the first connecting rod 231 is connected between the stiffener 25 and the crash barrier 13, and the second connecting rod 232 is connected between the sound barrier body 22 and the crash barrier 13. This effectively reinforces the stability of the sound barrier body 22, and ensures the quality of the sound barrier device 20 installed on the long-span bridge 10.
Illustratively, when the crash barrier 13 includes the barrier post 131 and the rail 132, the first connecting rod 231 may be connected between the stiffener 25 and the barrier post 131, and the second connecting rod 232 is connected between the sound barrier body 22 and the barrier post 131.
In this embodiment, the angle between the sound barrier pillar 24 and the sound barrier body 22 is 120 °. This allows the sound barrier columns 24 to better reinforce the sound barrier body 22.
In this embodiment, when the sound barrier apparatus 20 for suppressing vortex-induced resonance of the main girder of the long-span bridge is applied to the construction process of the long-span bridge 10, the sound barrier base 21 may be a base having a through hole, and the shape and size of the through hole are consistent with the shape and size of the cross section of the anti-collision guardrail 13 on the balustrade foundation 12. Therefore, the sound barrier body 22 and the anti-collision guardrail 13 can use the same base in the construction process of the large-span bridge 10, and the stability and the quality of the installation of the sound barrier device 20 are ensured.
In this embodiment, when the sound barrier apparatus 20 for suppressing vortex-induced resonance of the main girder of the long-span bridge is applied to the construction process or the transformation process of the long-span bridge 10, the sound barrier base 21 may be a base having a semi-enclosed opening, and the size of the semi-enclosed opening is consistent with the size of the section of the anti-collision guardrail 13 on the balustrade foundation 12.
Due to the fact that the anti-collision guardrail 13 of the large-span bridge 10 in the bridge forming state is already built, the sound barrier base 21 with the semi-surrounding type opening is selected, and therefore the sound barrier base can be applied to the bridge forming transformation process, and the installation stability and quality of the sound barrier device 20 are guaranteed.
In this embodiment, the angle between the sound barrier body 22 and the balustrade bedrock 12 may be 108 °. The angle between the sound barrier body 22 and the balustrade bedrock 12 is set to 108 °, which maximizes the effect of the sound barrier apparatus 20 (suppressing the main beam vortex response, suppressing the vortex-induced resonance of the main beam section, etc.).
Therefore, the sound barrier device 20 (which can be understood as a broken line type sound barrier) for inhibiting the vortex-induced resonance of the girder of the large-span bridge in the scheme changes the aerodynamic force applied to the section of the girder and weakens the vortex shedding strength of the wake zone of the section of the girder, thereby successfully inhibiting the vortex vibration response of the girder and solving the technical problem that the vortex vibration occurs to the section of the girder adopting the straight line type sound barrier. In addition, the sound barrier device 20 (broken line type sound barrier) provided by the present invention can suppress vortex-induced resonance of the girder section besides the noise reduction and environmental protection functions. And when vortex vibration occurs on the section of the main beam of the traditional linear sound barrier, additional pneumatic measures such as a guide plate, a flow inhibiting plate, a pneumatic grating and the like need to be installed. The sound barrier device 20 (broken line type sound barrier) of the scheme does not need to add extra pneumatic control measures, and is more economical and applicable.
In order to verify the application effect of the sound barrier device 20 for inhibiting the vortex-induced resonance of the girder of the large-span bridge, the scheme also provides a test method for inhibiting the vortex-induced resonance of the girder of the large-span bridge by using the sound barrier device 20. The method can be as follows:
analyzing the structural dynamic characteristics of the large-span bridge in the bridge forming state by adopting a finite element modeling method to obtain the natural frequencies of different orders of the full bridge in the bridge forming state; carrying out a wind tunnel test of a section model of a bridge-forming state section of a two-degree-of-freedom main beam, installing a sound barrier device 20, and measuring the vertical displacement and torsional displacement response of the main beam of the sound barrier device 20 under wind attack angles of 0 degrees, +3 degrees and-3 degrees, wherein the wind direction is vertical to the section of the main beam, and the damping ratio of the vertical vibration and the torsional vibration of the model in the test process is 0.727%; and measuring the resistance coefficient, the lift coefficient and the moment coefficient of the section of the main beam provided with the sound barrier device 20 when the section is in the wind attack angle range of-12 degrees to 12 degrees, the interval is 1 degree and the test wind speed is 7 m/s.
Specifically, in order to reflect the difference between the installation of the conventional linear sound barrier and the installation of the zigzag-shaped sound barrier according to the present embodiment, the following method may be adopted for the test:
firstly, structural dynamic characteristic analysis is carried out on a continuous beam bridge (a large-span bridge) in a bridge forming state: taking Shanxi Lin 29463a main bridge of a yellow river bridge as an example of a bridge forming state, carrying out structural dynamic characteristic analysis in the bridge forming state by adopting a finite element modeling method to obtain natural frequencies of different orders of the full bridge in the bridge forming state.
Then, static three-component force calculation can be performed on the main beam bridging section provided with the traditional linear type sound barrier through Computational Fluid Dynamics (CFD), and pneumatic three-component force of the main beam bridging section provided with the linear type sound barrier is obtained.
And then, a wind tunnel test (the wind direction is vertical to the section of the main beam) of a section model of the bridge-forming state section of the main beam with two degrees of freedom is carried out, the traditional linear sound barrier and the traditional broken line sound barrier are respectively installed, and the influence of different types of sound barriers on the vortex vibration performance of the section of the main beam is researched.
Considering the influence of different wind attack angles, the vertical displacement and torsional displacement response of the main beam of the sound barrier with two different types can be measured under the wind attack angles of 0 degrees, +3 degrees and-3 degrees respectively. In the test process, the damping ratio of the vertical vibration to the torsional vibration of the model is 0.727%.
Test results show that the vertical displacement of the main beam of the installed linear sound barrier main beam exceeds the standard limit value of 0.0511m at the wind attack angles of 0 degrees and +3 degrees, and the vertical displacement of the main beam of the installed broken line sound barrier main beam does not exceed the standard limit value at all wind deflection angles, so that the broken line sound barrier is recommended to be used for inhibiting the vortex vibration of the main beam aiming at the main beam section needing to be provided with the sound barrier.
In order to further research the influence of the broken line type sound barrier on the aerodynamic force of the section of the main beam, a wind tunnel test for testing the aerodynamic coefficient of a section model of the main beam is carried out. And measuring the resistance coefficient, the lift coefficient and the moment coefficient of the section of the main beam with the broken line type sound barrier when the section of the main beam is in a wind attack angle range of-12 degrees to 12 degrees, the interval is 1 degree and the test wind speed is 7m/s, so as to further research the influence of the broken line type sound barrier on the aerodynamic force of the main beam.
The test results of the linear sound barrier are respectively shown in fig. 3 and fig. 4, wherein fig. 3 is a schematic diagram of the variance of the vertical displacement root of the main beam of the linear sound barrier; fig. 4 is a schematic diagram of a root variance of torsional displacement of a linear sound barrier main beam.
The test results of the broken line type sound barrier are respectively shown in fig. 5 and fig. 6, wherein fig. 5 is a schematic diagram of the variance of the vertical displacement root of the main beam of the broken line type sound barrier; fig. 6 is a schematic diagram of the root variance of torsional displacement of a main beam of the broken line type sound barrier.
And the schematic diagram of the static three-component force coefficient of the broken line type sound barrier main beam section is shown in fig. 7.
Based on the above experimental results, it can be seen that:
when the girder section adopted traditional linear type sound barrier, the girder easily took place vortex induced resonance phenomenon, and the vortex amplitude value surpassed standard restriction. The sound barrier device 20 (i.e. the broken line type sound barrier) for inhibiting the vortex-induced resonance of the girder of the large-span bridge, which is provided by the scheme, can effectively inhibit the vortex-induced resonance of the girder. The broken line type sound barrier changes the aerodynamic force borne by the section of the main beam and weakens the vortex shedding strength of the wake area of the section of the main beam, thereby successfully inhibiting the vortex vibration response of the main beam and solving the technical problem that the vortex vibration can occur on the section of the main beam adopting the linear type sound barrier.
Secondly, different from the use purpose of the traditional sound barrier (linear sound barrier), the traditional sound barrier mainly has the function of reducing traffic noise, and the broken line type sound barrier can inhibit vortex-induced resonance of the section of the main beam besides the functions of noise reduction and environmental protection.
Furthermore, when vortex vibration occurs on the section of the main beam for installing the conventional linear sound barrier, additional pneumatic measures such as a guide plate, a flow inhibiting plate, a pneumatic grid and the like need to be installed. The installation of additional pneumatic measures can increase the construction cost and influence the overall aesthetic property of the bridge. The installation fold line type sound barrier is attractive in appearance, additional pneumatic control measures are not needed, and the installation fold line type sound barrier is more economical and applicable.
In summary, the embodiment of the present application provides a sound barrier apparatus and a method for suppressing vortex-induced resonance of a main beam of a large-span bridge, in which the sound barrier apparatus 20 (which may be understood as a broken-line sound barrier) changes aerodynamic force applied to a section of the main beam, and weakens strength of vortex shedding in a wake region of the section of the main beam, so that vortex vibration response of the main beam is successfully suppressed, and a technical problem that vortex vibration occurs in the section of the main beam using a linear sound barrier is solved. In addition, the sound barrier device 20 (broken line type sound barrier) provided by the scheme can inhibit vortex-induced resonance of the section of the main beam besides noise reduction and environmental protection functions. And when vortex vibration occurs on the section of the main beam of the traditional linear sound barrier, additional pneumatic measures such as a guide plate, a flow inhibiting plate, a pneumatic grating and the like need to be installed. The sound barrier device 20 (broken line type sound barrier) of the scheme does not need to add extra pneumatic control measures, and is more economical and applicable.
In this document, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions.
The above description is only an example of the present application and is not intended to limit the scope of the present application, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application.
Claims (7)
1. The utility model provides an restrain large-span bridge girder vortex-induced resonance's sound barrier device, its characterized in that, large-span bridge extend along first direction, follow on its girder wing end the first direction is extended and is laid railing keystone, railing keystone has relative first side and second side, first side is inboard to large-span bridge, the second side is outside to large-span bridge, be close to on the railing keystone the position of first side is followed first direction is extended and is set up crashproof guardrail, the sound barrier device includes:
the sound barrier base is arranged on the railing base stone in an extending mode along the first direction and is connected with the anti-collision guardrail;
the sound barrier body is arranged on the sound barrier base and close to the second side in an extending mode along the first direction, the angle between the sound barrier body and the railing bedrock is not vertical, and the sound barrier body inclines to the outer side of the large-span bridge;
wherein the angle between the sound barrier body and the railing kerb is 108 degrees;
the sound barrier device further comprises sound barrier stand columns, the sound barrier stand columns are arranged at the top end of the sound barrier body at intervals in an extending mode along the first direction, obtuse angles are formed between the sound barrier stand columns and the sound barrier body, and the sound barrier stand columns incline towards the inner side of the large-span bridge;
the included angle between the sound barrier upright post and the sound barrier body is 120 degrees.
2. The sound barrier apparatus for suppressing vortex-induced resonance in a girder of a long span bridge according to claim 1, wherein the sound barrier apparatus further comprises a connector,
the connecting piece is connected between the sound barrier body and the anti-collision guardrail.
3. The sound barrier device for suppressing the vortex-induced resonance of the girder of the large-span bridge according to claim 2, wherein a stiffening rib is provided between an included angle of the sound barrier upright and the sound barrier body for one sound barrier upright,
the connecting piece includes head rod and second connecting rod, the head rod is connected the stiffening rib with between the anticollision barrier, the second connecting rod is connected the sound barrier body with between the anticollision barrier.
4. The sound barrier apparatus for suppressing vortex-induced resonance in a main girder of a long-span bridge according to claim 3, wherein the anti-collision guardrail comprises guardrail posts and railings,
the guardrail posts are arranged on the guardrail foundation stone at intervals and extend along the first direction, and the positions of the guardrail posts are close to the first side;
the guardrail posts are arranged on the side walls of the plurality of guardrail posts facing the inner side of the large-span bridge in an extending manner along the first direction;
correspondingly, the first connecting rod is connected between the stiffening rib and the guardrail upright post, and the second connecting rod is connected between the sound barrier body and the guardrail upright post.
5. The sound barrier device for inhibiting the vortex-induced resonance of the girder of the large-span bridge according to claim 1, wherein the sound barrier base is provided with a through hole, the shape and the size of the through hole are consistent with the shape and the size of the cross section of the anti-collision guardrail on the railing kerb, and the sound barrier device for inhibiting the vortex-induced resonance of the girder of the large-span bridge is applied to the construction process of the large-span bridge.
6. The sound barrier device for suppressing the vortex-induced resonance of the girder of the large-span bridge according to claim 1, wherein the sound barrier base has a semi-enclosed opening with a size consistent with that of the cross section of the anti-collision guardrail on the railing bedrock, and the sound barrier device for suppressing the vortex-induced resonance of the girder of the large-span bridge is applied to the building process or the reconstruction process of the large-span bridge.
7. A test method of a sound barrier device for inhibiting vortex-induced resonance of a girder of a long-span bridge is applied to the sound barrier device for inhibiting the vortex-induced resonance of the girder of the long-span bridge, which is disclosed by any one of claims 1 to 6, and the method comprises the following steps:
analyzing the structural dynamic characteristics of the large-span bridge in the bridge forming state by adopting a finite element modeling method to obtain the natural frequencies of different orders of the full bridge in the bridge forming state;
carrying out a wind tunnel test on a section model of a bridge-forming state section of a two-degree-of-freedom main beam, installing the sound barrier device, and measuring the vertical displacement and torsional displacement response of the main beam of the sound barrier device under wind attack angles of 0 degree, +3 degree and-3 degrees, wherein the wind direction is vertical to the section of the main beam, and the damping ratio of the vertical vibration and the torsional vibration of the model in the test process is 0.727%;
and measuring the resistance coefficient, the lift coefficient and the moment coefficient of the section of a main beam of the sound barrier device when the section is in a wind attack angle range of-12 degrees, the interval is 1 degree and the test wind speed is 7 m/s.
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