CN109753746A - A kind of bridge adaptive boundary moment of flexure control system, deflection of bridge span adaptive approach and the method for calculating deflection of bridge span - Google Patents
A kind of bridge adaptive boundary moment of flexure control system, deflection of bridge span adaptive approach and the method for calculating deflection of bridge span Download PDFInfo
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- CN109753746A CN109753746A CN201910033428.9A CN201910033428A CN109753746A CN 109753746 A CN109753746 A CN 109753746A CN 201910033428 A CN201910033428 A CN 201910033428A CN 109753746 A CN109753746 A CN 109753746A
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Abstract
The invention particularly discloses a kind of bridge adaptive boundary moment of flexure control system, deflection of bridge span adaptive approach and the methods for calculating deflection of bridge span.Bridge adaptive boundary moment of flexure control system includes adaptive moment of flexure control system and simply supported beam system, simply supported beam system includes the first fixing end, the second fixing end, simply supported beam, fixed hinge support and roller support, and adaptive moment of flexure control system includes third fixing end, control spring and control beam；Simply supported beam one end is connect with fixed hinge support, and the other end is connect with roller support；Control beam one end is connect with roller support, and the other end is connect with control spring one end, and the other end for controlling spring is fixedly connected in third fixing end；When freely-supported beam stress, the position for controlling beam changes with simply supported beam deformation and roller support activity.By calculating, optimized parameter can be calculated for the bridge of different operating conditions in the deflection formula after obtaining the control of simply supported beam adaptive boundary moment of flexure.
Description
Technical field
The invention belongs to bridge moment of flexure control field, it is related to a kind of bridge adaptive boundary moment of flexure control system, bridge is scratched
The method spent adaptive approach and calculate deflection of bridge span.
Background technique
With the high speed sustainable development of China's economy, transport task is continuously increased.For road surface transport infrastructure ---
Bridge, high-speed overload vehicle can cause bridge vibration and large deflection to change, drastically influence the safety and service life of bridge.
In terms of the prior art has focused largely on the monitoring to deflection of bridge span, for example, the deflection of bridge structure based on wireless tilt measures system
System is studied with the bridge flexiblity monitor system etc. based on visual light imaging technology.However, only carrying out deflection monitoring work in bridge
And it is unsatisfactory for requirement at this stage, it needs simply and effectively to intervene bridge, realizes the bending deflection for reducing bridge.Mesh
Before, correlative study in this regard is less；The Main Girder Deflection control device of simply supported girder bridge is using compressible conveyor screw as branch
The amount of deflection variation of support control simply supported beam, but the structure is complex, and not easy to install.
Summary of the invention
The purpose of the present invention is to provide a kind of bridge adaptive boundary moment of flexure control systems, deflection of bridge span adaptive approach
And the method for calculating deflection of bridge span, the system structure is simple, and for the bridge of different operating conditions, amount of deflection parameter can be calculated.
The present invention is to be achieved through the following technical solutions:
A kind of bridge adaptive boundary moment of flexure control system, including adaptive moment of flexure control system and simply supported beam system, letter
Strutbeam system includes the first fixing end, the second fixing end, simply supported beam, fixed hinge support and roller support, adaptive moment of flexure control
System processed includes third fixing end, control spring and control beam；
Simply supported beam one end is connect with fixed hinge support, and the other end is connect with roller support；Fixed hinge support and first
Fixing end connection, roller support are located in the second fixing end；
Control beam one end is connect with roller support, and the other end is connect with control spring one end, and the other end for controlling spring is solid
Surely it is connected in third fixing end；
When freely-supported beam stress, the position for controlling beam changes with simply supported beam deformation and roller support activity.
Further, first fixing end, the second fixing end and third fixing end are the fixing piece connecting with the earth.
The invention also discloses using the bridge adaptive boundary moment of flexure control system deflection of bridge span adaptive approach,
Bridge is simplified to simply supported beam, moving object is reduced to concentrated force F to the active force of bridge on bridge, and simply supported beam is in concentrated force F
It deforms under effect, generates amount of deflection ω downwards, deformation simply supported beam passes through roller support, drives control beam left end with θBAngle to
Upper inclination, control beam right end move up, and moving up distance is s θB, spring is controlled by upward pulling force, and generation acts on fixed hinge branch
The torque of seat, adaptively adjusts freely-supported beam deflection.
It is curved the invention also discloses bridge adaptive boundary is calculated using the bridge adaptive boundary moment of flexure control system
The method of amount of deflection after square control, it is assumed that the bending stiffness of simply supported beam is EI, and length l, fixed hinge support is with concentrated force F's
Distance is a, and concentrated force F and roller support distance are b；The control spring stiffness coefficient for controlling spring is k, and control beam length is s,
By calculating, the deflection formula after obtaining the control of simply supported beam adaptive boundary moment of flexure are as follows:
Or
Wherein, x is to calculate the position of amount of deflection at a distance from fixed hinge support, and w is the amount of deflection at the x chosen.
Compared with prior art, the invention has the following beneficial technical effects:
Bridge adaptive boundary moment of flexure control system disclosed by the invention, including adaptive moment of flexure control system and simply supported beam
System two parts, simply supported beam system include simply supported beam, fixed hinge support and roller support, and adaptive moment of flexure control system includes
Third fixing end, control spring and control beam；Simply supported beam one end is connect with fixed hinge support, and the other end and roller support connect
It connects；Control beam one end is connect with roller support, and the other end is connect with control spring one end, and the other end for controlling spring is fixedly connected
In third fixing end；When freely-supported beam stress, the position for controlling beam becomes with simply supported beam deformation and roller support activity
Change.Simply supported beam deforms under concentrated force effect, generates amount of deflection downwards.It deforms simply supported beam and passes through roller support, drive control
Beam left end is tilted upwards with angle, and control beam right end moves up distance, and the control spring that control beam right end is fixedly connected is by upward
Pulling force generates the torque for acting on fixed hinge support, is adaptively adjusted to freely-supported beam deflection.It is larger for deflection of bridge span
Bridge, the appropriate pretightning force for increasing control spring can reduce maintenance frequency.
The method disclosed by the invention for calculating the amount of deflection after the control of bridge adaptive boundary moment of flexure, by by simply supported beam and control
The some known parameters and measurement parameter of beam processed are updated in calculation formula, for the bridge of different operating conditions, can be calculated
Optimized parameter.For more common bridge, control method of the invention can moderately extend the safety coefficient and maximum of bridge
Bearing capacity improves service efficiency and reduces life and property loss.
Detailed description of the invention
Fig. 1 is bridge adaptive boundary moment of flexure control system architecture schematic diagram；
Wherein, 1 is control spring, and 2 be control beam, and 3 be the first fixing end, and 4 be fixed hinge support, and 5 be simply supported beam, 6
To deform simply supported beam, 7 be roller support, and 8 be the second fixing end, and 9 be third fixing end.
Specific embodiment
Below with reference to specific embodiment, the present invention is described in further detail, it is described be explanation of the invention and
It is not to limit.
As shown in Figure 1, this bridge adaptive boundary moment of flexure control system includes adaptive moment of flexure control system and simply supported beam
Two parts of system.Simply supported beam system includes the first fixing end 3, the second fixing end 8, simply supported beam 5, fixed hinge support 4 and rolling
Dynamic support 7.Adaptive moment of flexure control system includes third fixing end 9, control spring 1 and control beam 2, is arranged in roller support 7
Near.
5 left end of simply supported beam is connect with fixed hinge support 4, and fixed hinge support 4 is connect with the first fixing end 3；Simply supported beam 5
Right end is connect with roller support 7, and roller support 7 is placed in the second fixing end 8；Roller support 7 is connect with control beam 2.In letter
At 5 right end of strutbeam, third fixing end 9 is fixedly connected with control 1 lower end of spring, and control 1 upper end of spring and control 2 right end of beam connect
It connects, control 2 left end of beam is connect with roller support 7, and the position for controlling beam 2 becomes with simply supported beam 5 and 7 activity of roller support
Change.
First fixing end 3, the second fixing end 8 and the third fixing end 9 refers to the fixing piece connecting with the earth.
Bridge adaptive boundary moment of flexure control principle is expressed as follows: active force of the moving object on bridge to bridge is simplified
For concentrated force F, bridge is simplified to simply supported beam.Simply supported beam 5 deforms under concentrated force F effect, generates amount of deflection ω downwards, such as becomes
Shown in shape simply supported beam 6.It deforms simply supported beam 6 and passes through roller support 7, drive control 2 left end of beam with θBAngle tilts upwards, controls beam
2 right ends move up s θBDistance, the control spring 1 that control 2 right end of beam is fixedly connected are acted on fixed hinge by upward pulling force, generation
The torque M of chain support 4B, 5 amount of deflection of simply supported beam is adaptively adjusted.
According to the size of concentrated force F and active position difference, 5 right end of simply supported beam controls the acclivitous angle of beam 2 difference,
The power that control spring 1 acts on control beam 2 is of different sizes, and then realizes adaptive to the progress of institute's bending moment in 5 boundary of simply supported beam
It should adjust.
In simply supported beam adaptive boundary moment of flexure control method, it is assumed that the bending stiffness of simply supported beam 5 be EI, length l, Gu
Rocker bar bearing 4 is determined at a distance from concentrated force F for a, concentrated force F and roller support 7 are apart from for b；At fixed hinge support 4, become
Shape simply supported beam 6 and 5 angle of simply supported beam are θA；At roller support 7, deformation simply supported beam 6 and 5 angle of simply supported beam are θB, control beam 2
Left end is with θBAngle tilts upwards；2 length of control beam of 5 right end of simply supported beam is s；The spring stiffness coefficient for controlling spring 1 is k.
By calculating, the deflection formula after obtaining the control of simply supported beam adaptive boundary moment of flexure are as follows:
The following are a specific embodiments:
Example 1: bridge length l is 32m, and bending stiffness coefficient EI is 5.18 × 108N·m2, concentrated force F and fixed hinge
For support 4 apart from for a, size is 1.8 × 104N, i.e. a=20m, b=12m；Control beam length is 3m, controls spring rate
It is 6 × 107.When taking x=16m, that is, calculating with the amount of deflection of bridge at fixed hinge support 4 apart 16m is 0.83cm, if the bridge
Beam does not have adaptive boundary moment of flexure control system, by existing=conventionally known Deflection Formula, calculates at x=16m
Amount of deflection is 2.17cm, for the amount of deflection 2.17cm that the bridge for no adaptive boundary moment of flexure control that compares generates, reduces amount of deflection
61.86%, control effect is preferable.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the scope of the present invention.It is all
Within the spirit and principles in the present invention, made any modification, equivalent replacement and improvement be should be included in of the present invention
Within protection scope.
Claims (4)
1. a kind of bridge adaptive boundary moment of flexure control system, which is characterized in that including adaptive moment of flexure control system and freely-supported
Girder system system, simply supported beam system include the first fixing end (3), the second fixing end (8), simply supported beam (5), fixed hinge support (4) and
Roller support (7), adaptive moment of flexure control system include third fixing end (9), control spring (1) and control beam (2)；
Simply supported beam (5) one end is connect with fixed hinge support (4), and the other end is connect with roller support (7)；Fixed hinge support
(4) it is connect with the first fixing end (3), roller support (7) is located on the second fixing end (8)；
Control beam (2) one end is connect with roller support (7), and the other end is connect with control spring (1) one end, control spring (1)
The other end is fixedly connected on third fixing end (9)；
When simply supported beam (5) stress, the position for controlling beam (2) becomes with simply supported beam (5) deformation and roller support (7) activity
Change.
2. bridge adaptive boundary moment of flexure control system according to claim 1, which is characterized in that described first is fixed
End (3), the second fixing end (8) and third fixing end (9) are the fixing piece connecting with the earth.
3. using the deflection of bridge span adaptive approach of bridge adaptive boundary moment of flexure control system as claimed in claim 1 or 2,
It is characterized in that:
Bridge is simplified to simply supported beam (5), moving object is reduced to concentrated force F, simply supported beam (5) to the active force of bridge on bridge
It deforms under concentrated force F effect, generates amount of deflection ω downwards, roller support (7) are passed through in deformation simply supported beam (6), drive control
Beam (2) left end is with θBAngle tilts upwards, and control beam (2) right end moves up, and moving up distance is s θB, spring (1) is controlled by upward
Pulling force generates the torque for acting on fixed hinge support (4), is adaptively adjusted to simply supported beam (5) amount of deflection.
4. calculating bridge adaptive boundary moment of flexure using bridge adaptive boundary moment of flexure control system as claimed in claim 1 or 2
The method of amount of deflection after control, it is characterised in that:
Assuming that the bending stiffness of simply supported beam (5) is EI, length l, fixed hinge support (4) is a, collection at a distance from concentrated force F
Middle power F and roller support (7) distance are b；The spring stiffness coefficient for controlling spring (1) is k, and control beam (2) length is s, is passed through
It calculates, the deflection formula after obtaining the control of simply supported beam (5) adaptive boundary moment of flexure are as follows:
Or
Wherein, x is to calculate the position of amount of deflection at a distance from fixed hinge support (4), and w is the amount of deflection at the x chosen.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910033428.9A CN109753746B (en) | 2019-01-14 | 2019-01-14 | Bridge self-adaptive boundary bending moment control system, bridge deflection self-adaptive method and method for calculating bridge deflection |
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| CN201910033428.9A CN109753746B (en) | 2019-01-14 | 2019-01-14 | Bridge self-adaptive boundary bending moment control system, bridge deflection self-adaptive method and method for calculating bridge deflection |
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| CN110487496A (en) * | 2019-07-08 | 2019-11-22 | 扬州市市政建设处 | Improvement area-moment method based on the strain of long gauge length identifies deflection of bridge span method |
| CN115374556A (en) * | 2022-08-08 | 2022-11-22 | 中建八局第三建设有限公司 | Bailey truss deflection calculation method considering pin shaft slippage and rigidity correction |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110487496A (en) * | 2019-07-08 | 2019-11-22 | 扬州市市政建设处 | Improvement area-moment method based on the strain of long gauge length identifies deflection of bridge span method |
| CN115374556A (en) * | 2022-08-08 | 2022-11-22 | 中建八局第三建设有限公司 | Bailey truss deflection calculation method considering pin shaft slippage and rigidity correction |
| CN115374556B (en) * | 2022-08-08 | 2023-09-08 | 中建八局第三建设有限公司 | Bailey frame deflection calculation method considering pin roll slippage and rigidity correction |
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