CN116556175A - Bridge toughness promotes combination shock attenuation stop device - Google Patents
Bridge toughness promotes combination shock attenuation stop device Download PDFInfo
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- CN116556175A CN116556175A CN202310510291.8A CN202310510291A CN116556175A CN 116556175 A CN116556175 A CN 116556175A CN 202310510291 A CN202310510291 A CN 202310510291A CN 116556175 A CN116556175 A CN 116556175A
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- 230000035939 shock Effects 0.000 title claims description 4
- 238000013016 damping Methods 0.000 claims abstract description 56
- 230000000670 limiting effect Effects 0.000 claims abstract description 45
- 230000000694 effects Effects 0.000 claims abstract description 21
- 230000009471 action Effects 0.000 claims abstract description 17
- 229910001285 shape-memory alloy Inorganic materials 0.000 claims description 73
- 238000001816 cooling Methods 0.000 claims description 23
- 238000006073 displacement reaction Methods 0.000 claims description 18
- 229920000049 Carbon (fiber) Polymers 0.000 claims description 13
- 238000005452 bending Methods 0.000 claims description 13
- 239000004917 carbon fiber Substances 0.000 claims description 13
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims description 13
- 230000000630 rising effect Effects 0.000 claims description 12
- 230000033001 locomotion Effects 0.000 claims description 8
- 239000002131 composite material Substances 0.000 claims description 7
- 210000001503 joint Anatomy 0.000 claims 2
- 238000005299 abrasion Methods 0.000 abstract description 3
- 230000002411 adverse Effects 0.000 abstract description 3
- 238000000034 method Methods 0.000 abstract description 2
- 238000010586 diagram Methods 0.000 description 7
- 238000011084 recovery Methods 0.000 description 7
- 230000008859 change Effects 0.000 description 6
- 230000008602 contraction Effects 0.000 description 6
- 230000006870 function Effects 0.000 description 5
- 230000009467 reduction Effects 0.000 description 5
- 230000006872 improvement Effects 0.000 description 4
- 230000007547 defect Effects 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 230000002035 prolonged effect Effects 0.000 description 3
- 230000000737 periodic effect Effects 0.000 description 2
- 238000000926 separation method Methods 0.000 description 2
- 230000002277 temperature effect Effects 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 230000001788 irregular Effects 0.000 description 1
- 230000008439 repair process Effects 0.000 description 1
- 230000003252 repetitive effect Effects 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
Classifications
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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
- E01D2101/00—Material constitution of bridges
- E01D2101/30—Metal
- E01D2101/34—Metal non-ferrous, e.g. aluminium
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A30/00—Adapting or protecting infrastructure or their operation
- Y02A30/30—Adapting or protecting infrastructure or their operation in transportation, e.g. on roads, waterways or railways
Abstract
The invention discloses a bridge toughness lifting combined damping limiting device which comprises a speed damper and an elastic cable limiting device, wherein the speed damper is connected with the elastic cable limiting device in parallel, the elastic cable limiting device comprises a compensation element and an elastic cable, the compensation element is connected with the elastic cable in series, and the compensation element can offset the influence of temperature secondary internal force. The device shares most of high-frequency reciprocating vibration load by replacing the speed damper through the elastic cable limiting device, reduces abrasion of the speed damper, prolongs service life of the speed damper, simultaneously under the action of sporadic earthquake load, the elastic cable can also jointly play a damping limiting function with the speed damper, overcomes the problem that a single speed damper is difficult to reset after being displaced, and improves earthquake-resistant toughness of a bridge structure. The elastic inhaul cable is connected with the temperature compensation element in series, meets the low-frequency reciprocating temperature deformation requirement in the using process of the structure, eliminates adverse effects of temperature secondary internal force, and improves the stability of normal operation of the bridge.
Description
Technical Field
The invention relates to the field of bridge engineering, in particular to a combined damping and limiting device for bridge toughness improvement.
Background
The current structural earthquake resistance has been changed from the structural earthquake resistance based on life safety to the structural function restorable and fast repairable after earthquake, which puts demands on the toughness of bridge earthquake resistance. The common damping limiting device for the bridge comprises a speed damper and a displacement damper, but the two general damping limiting devices are difficult to meet the anti-seismic design requirement of the bridge based on toughness. If the typical representative of the speed damper is a viscous damper, the damping force of the viscous damper changes along with the change of the speed, the damping effect can be adjusted according to the vibration frequency and the vibration amplitude of the bridge, the vibration response of the bridge under the earthquake action of the bridge is effectively reduced, the earthquake resistance of the bridge is improved, the bridge is not affected by temperature deformation, but the viscous damper does not have self-resetting capability, the residual displacement after the earthquake is large, the structure recovery difficulty is high, and the toughness recovery capability of the bridge is reduced. The typical representative of the displacement damper is a steel damper, the damping force of the damper increases along with the increase of displacement, the hysteresis energy consumption capability of the damper is strong after the damper enters a plastic stage, the damping and limiting effects are good, but the temperature secondary internal force can be generated to influence the normal use of the structure, and the device also generates residual deformation which is difficult to recover after entering the plastic stage to influence the toughness recovery capability of the structure.
On the other hand, when the span of the bridge is greater than or equal to 200 meters, the large-span bridge is likely to cause larger vibration due to the fact that the bridge is smaller in rigidity and is subjected to the action of vehicles and wind loads in daily use, the load is frequent, the damper is not large in output force, the frequency of reciprocating motion is high, the damper easily exceeds the allowable upper working limit before an earthquake arrives, oil leakage or fatigue problems are caused, if the toughness performance of the bridge is seriously affected by replacement and repair in time, and the robustness of normal operation of the bridge is reduced.
Disclosure of Invention
The invention aims to solve the problems that in the prior art, when only a damper is used as a bridge damping element, the bridge has low post-earthquake recovery capability and is greatly influenced by temperature deformation, oil leakage or fatigue durability and the like are easy to occur to the device under the action of high-frequency reciprocating load, and the toughness performance of the bridge is influenced, and provides the combined damping limiting device for improving the toughness of the bridge.
In order to achieve the above object, the present invention provides the following technical solutions:
the utility model provides a bridge toughness promotes combination shock attenuation stop device, includes speed damper and elastic cable stop device, speed damper with elastic cable stop device connects in parallel, elastic cable stop device includes compensation element and elastic cable, compensation element with elastic cable establishes ties, compensation element can offset the influence of temperature secondary internal force.
According to the combined damping and limiting device for improving the toughness of the bridge, the elastic inhaul cable limiting device is connected with the speed damper in parallel, the elastic inhaul cable limiting device is used for replacing the speed damper to share most of high-frequency reciprocating vibration load, abrasion of the speed damper is reduced, the service life of the speed damper is prolonged, meanwhile, under the action of sporadic earthquake load, the elastic inhaul cable and the speed damper can jointly play a damping and limiting role, the problem that the single speed damper is difficult to reset after being displaced is solved, and the anti-seismic toughness of the bridge structure is improved. Specifically, the elastic inhaul cable limiting device is arranged as a compensation element and an elastic inhaul cable which are connected in series. The temperature effect belongs to low-frequency periodic load, the speed damper has the characteristic of self-adaptive temperature deformation, but due to the addition of the elastic inhaul cable, when the device is acted by external force, the elastic inhaul cable can deform to a certain extent, so that certain internal force is generated, the occurrence of temperature secondary internal force can be possibly caused, adverse effects on normal use of the structure are caused, and the elastic constraint must be controlled within a limited range or even completely released.
Optionally, the compensation element is a temperature compensation element, the temperature compensation element includes shape memory alloy board and backstop, shape memory alloy board can be influenced by the temperature and change from bending state to extension state or change from extension state to bending state, the one end of elastic cable is the anchor plate, the other end of elastic cable passes shape memory alloy board with the backstop, one side of shape memory alloy board with the anchor plate butt, the opposite side of shape memory alloy board with backstop butt.
Preferably, the shape memory alloy plate and the stop member form a temperature compensation element so as to counteract the temperature secondary internal force generated by the elastic inhaul cable. The deformation amount of the temperature is released by utilizing the characteristic that the shape memory alloy plate is converted from a bending state to an extending state or from the extending state to the bending state according to the change of the temperature. Meanwhile, the arrangement of the stop piece can ensure that the position of the elastic inhaul cable on the shape memory alloy plate cannot be changed, so that the stability and the reliability of the device are ensured, the influence of temperature secondary internal force can be effectively counteracted by the design, and the service life and the performance of the device are improved.
Optionally, the number of the temperature compensation elements is at least two.
When the deformation amount of the single temperature compensation element is insufficient to release the temperature deformation amount, at least two temperature compensation elements can be used in a superposition mode until the deformation amount of the temperature compensation element is sufficient to release the temperature deformation amount, so that the damping device can adapt to more use scenes.
Optionally, the shape memory alloy plate is a cooling shape memory alloy plate, and the cooling shape memory alloy plate can be deformed from an initial bending state to an extending state under the cooling effect.
The shape memory alloy plate is preferably a cooling shape memory alloy plate, the damping device can be installed on one side, close to the axle wire, between the bridge tower and the main beam, of the bridge at the moment, if the bridge is affected by cooling, the main beam can shrink towards the middle of the main beam according to the principle of thermal expansion and cold contraction, and the elastic inhaul cable of the damping device is pulled.
Optionally, the shape memory alloy plate is a temperature-rising shape memory alloy plate, and the temperature-rising shape memory alloy plate can be deformed from an initial extended state to a bent state under the action of temperature rising.
The shape memory alloy plate is preferably a temperature-rising shape memory alloy plate, the damping device can be installed on one side, close to the end part of the main beam, between the bridge tower and the main beam at the moment, if the bridge is affected by temperature rising, the main beam can expand towards the two ends of the main beam according to the principle of thermal expansion and cold contraction, and the elastic inhaul cable of the damping device is pulled at the moment, so that the deformation caused by temperature rising is released by utilizing the characteristic that the temperature-rising shape memory alloy plate can be deformed from an initial expansion state to a bending state under the action of temperature rising.
Optionally, the elastic inhaul cable is made of carbon fiber composite materials.
The elastic inhaul cable is preferably a carbon fiber inhaul cable, on the one hand, the carbon fiber composite material has the characteristics of light weight, high strength, high durability and excellent fatigue resistance, and is an ideal material for overcoming the defects of easiness in oil leakage and low durability of the speed damper. On the other hand, the carbon fiber inhaul cable has the characteristic of elasticity and large strain, and in the design bearing capacity range, the inhaul cable is always in an elastic state, so that the elasticity self-resetting capability can be provided for a structural system, the residual displacement of a structure after earthquake is reduced, and the resetting difficulty of the structure after earthquake is reduced. The two characteristics can effectively improve the toughness performance of the bridge, in particular the function recovery capability of the vibration control and strong vibration action structure which are normally used.
Optionally, the compensation component is mechanical compensation component, mechanical compensation component includes the swiveling wheel, adds tight pulley and tight pulley, elastic cable with the swiveling wheel is connected, and drives the swiveling wheel rotates, be provided with the internal tooth in the tight pulley, it is provided with the external tooth to add on the tight pulley, the external tooth can with internal tooth locking, restriction add tight pulley with the relative motion of tight pulley, be equipped with the breach on the swiveling wheel, add and be provided with interior convex part on the tight pulley, interior convex part can insert the breach, the swiveling wheel passes through interior convex part drives add tight pulley rotation, add tight pulley is configured, works as when the swiveling wheel is rotatory at a slow speed, interior convex part crookedly inserts the breach, the external tooth with the internal tooth separation, when the swiveling wheel is rotatory fast, interior convex part with the breach is in half clutch state, the external tooth with the internal tooth interlock.
Under the low-frequency load effect, for example, the temperature load effect, drive the swiveling wheel by the elastic guy cable and rotate slowly, because the swiveling wheel inserts the breach department of swiveling wheel through interior convex part, the swiveling wheel also drives the swiveling wheel and rotates slowly this moment, the external tooth of swiveling wheel and the internal tooth separation of tight pulley this moment, can guarantee that the structure is in the relaxation state, the complete release temperature warp, when high-frequency load effect, for example vehicle or wind load, the elastic guy cable drives swiveling wheel fast rotation, because swiveling wheel inserts the breach department of swiveling wheel through interior convex part, swiveling wheel also drives the swiveling wheel fast rotation this moment, receive the influence of centrifugal force, interior convex part and breach are in half clutch state this moment, external tooth and internal tooth interlock, restriction swiveling wheel with the relative motion of tight pulley, and then the rotation of restriction swiveling wheel, play spacing effect to the elastic guy cable.
Optionally, the design displacement of the elastic inhaul cable is greater than the design displacement of the speed damper.
The design displacement of the elastic inhaul cable is larger than that of the speed damper, so that the elastic inhaul cable is prevented from being damaged before the speed damper, and the elastic automatic reset of the elastic inhaul cable after the earthquake can be utilized.
Optionally, the speed damper is a viscous damper.
The speed damper is preferably a viscous speed damper, and the damping effect can be adjusted according to the vibration frequency and the amplitude of the bridge by utilizing the characteristic that the damping force of the viscous speed damper changes along with the speed change, so that a better damping effect is achieved.
The bridge comprises a bridge tower and a main beam, wherein the bridge toughness lifting combined damping limiting device is arranged between the bridge tower and the main beam.
Compared with the prior art, the invention has the beneficial effects that:
1. according to the combined damping and limiting device for improving the toughness of the bridge, the elastic inhaul cable limiting device is connected with the speed damper in parallel, the elastic inhaul cable limiting device is used for replacing the speed damper to share most of high-frequency reciprocating vibration load, abrasion of the speed damper is reduced, the service life of the speed damper is prolonged, meanwhile, under the action of sporadic earthquake load, the elastic inhaul cable and the speed damper can jointly play a damping and limiting role, the problem that the single speed damper is difficult to reset after being displaced is solved, and the anti-seismic toughness of the bridge structure is improved. Specifically, the elastic inhaul cable limiting device is arranged as a compensation element and an elastic inhaul cable which are connected in series. The temperature effect belongs to low-frequency periodic load, the speed damper has the characteristic of self-adaptive temperature deformation, but due to the addition of the elastic inhaul cable, when the device is acted by external force, the elastic inhaul cable can deform to a certain extent, so that certain internal force is generated, the occurrence of temperature secondary internal force can be possibly caused, adverse effects on normal use of the structure are caused, and the elastic constraint must be controlled within a limited range or even completely released.
2. Preferably, the shape memory alloy plate and the stop member form a temperature compensation element so as to counteract the temperature secondary internal force generated by the elastic inhaul cable. The shape memory alloy plate is preferably a cooling shape memory alloy plate, the damping device can be arranged on one side, close to the central axis of the bridge, between the bridge tower and the main beam at the moment, if the bridge is affected by cooling, the main beam can shrink towards the middle part of the main beam according to the principle of thermal expansion and cold contraction, and the elastic inhaul cable of the damping device is pulled at the moment, so that the deformation caused by cooling is released by utilizing the characteristic that the cooling shape memory alloy plate can be deformed from an initial bending state to an extending state under the cooling effect; the shape memory alloy plate is preferably a temperature-rising shape memory alloy plate, the damping device can be installed on one side, close to the end part of the main beam, between the bridge tower and the main beam at the moment, if the bridge is affected by temperature rising, the main beam can expand towards the two ends of the main beam according to the principle of thermal expansion and cold contraction, and the elastic inhaul cable of the damping device is pulled at the moment, so that the deformation caused by temperature rising is released by utilizing the characteristic that the temperature-rising shape memory alloy plate can be deformed from an initial expansion state to a bending state under the action of temperature rising. Meanwhile, the arrangement of the stop piece can ensure that the position of the elastic inhaul cable on the shape memory alloy plate cannot be changed, so that the stability and the reliability of the device are ensured, the influence of temperature secondary internal force can be effectively counteracted by the design, and the service life and the performance of the device are improved.
3. The elastic inhaul cable is preferably a carbon fiber inhaul cable, on the one hand, the carbon fiber composite material has the characteristics of light weight, high strength, high durability and excellent fatigue resistance, and is an ideal material for overcoming the defects of easiness in oil leakage and low durability of the speed damper. On the other hand, the carbon fiber inhaul cable has the characteristic of large elastic strain, and in the design bearing capacity range, the inhaul cable is always in an elastic state, so that elastic self-resetting capability can be provided for a structural system, and the resetting difficulty of a post-earthquake structure is reduced. The two characteristics can effectively improve the toughness performance of the large-span bridge, in particular to the function recovery capability of a vibration control and strong vibration function structure which are normally used.
4. The compensation element is a mechanical compensation element, under the action of low-frequency load, such as temperature load, the elastic inhaul cable drives the rotating wheel to rotate slowly, because the tightening wheel is inserted into the notch of the rotating wheel through the inner convex part, the rotating wheel also drives the tightening wheel to rotate slowly, the outer teeth of the tightening wheel are separated from the inner teeth of the fixed wheel, the structure can be guaranteed to be in a loose state, the temperature deformation is completely released, when the high-frequency load acts on, such as a vehicle or wind load, the elastic inhaul cable drives the rotating wheel to rotate rapidly, because the tightening wheel is inserted into the notch of the rotating wheel through the inner convex part, the rotating wheel also drives the tightening wheel to rotate rapidly, the inner convex part and the notch are in a semi-clutch state under the influence of centrifugal force, the outer teeth are engaged with the inner teeth at the moment, the relative movement of the tightening wheel and the fixed wheel is limited, and the rotation of the rotating wheel is further limited, and the effect of limiting the elastic inhaul cable is achieved.
Drawings
FIG. 1 is a schematic view of a combined damping and limiting device for bridge toughness improvement;
FIG. 2 is an initial state diagram of a temperature compensation element when a temperature-reduced shape memory alloy plate is used;
FIG. 3 is a diagram showing a temperature-decreasing state of the temperature compensation element when the temperature-decreasing shape memory alloy plate is used;
FIG. 4 is an initial state diagram of a temperature compensating element when a temperature rising shape memory alloy plate is used;
FIG. 5 is a diagram showing a temperature rise state of the temperature compensation element when the temperature rise shape memory alloy plate is used;
FIG. 6 is a schematic diagram of a mechanical compensation element;
FIG. 7 is a schematic diagram of a rotating wheel structure;
FIG. 8 is a schematic view of a pinch roller configuration;
FIG. 9 is a schematic illustration of a fixed sheave structure;
fig. 10 is a schematic diagram of a bridge structure carrying a combined damping and limiting device for bridge toughness improvement.
Reference numerals: 1-speed damper, 21-compensating element, 211-shape memory alloy plate, 212-stopper, 213-rotating wheel, 2131-notch, 214-tightening wheel, 2141-external tooth, 2142-internal protrusion, 215-fixed wheel, 2151-internal tooth, 22-elastic stay rope, 221-anchor plate, 3-bridge tower, 4-main beam.
Detailed Description
The present invention will be described in further detail with reference to test examples and specific embodiments. It should not be construed that the scope of the above subject matter of the present invention is limited to the following embodiments, and all techniques realized based on the present invention are within the scope of the present invention.
Example 1
As shown in fig. 1-5, the invention provides a combined damping and limiting device for bridge toughness promotion, which comprises a speed damper 1 and an elastic inhaul cable limiting device, wherein the speed damper 1 and the elastic inhaul cable limiting device are connected in parallel. The elastic inhaul cable limiting device is used for sharing most of normally used load of the speed damper 1, and the service life of the speed damper 1 is prolonged. Specifically, the elastic cable limiting device is configured as a compensating element 21 and an elastic cable 22 which are connected in series, the compensating element 21 is used for counteracting the influence of the temperature secondary internal force generated by the elastic cable 22, and the elastic cable 22 is used for bearing the horizontal load force transmission effect between the main beam 4 and the bridge tower 3 under the high-frequency load effect.
In this embodiment, the elastic cable 22 is a carbon fiber cable, and the compensation element 21 is a temperature compensation element.
The elastic inhaul cable 22 is preferably made of carbon fiber composite materials, on the one hand, the carbon fiber composite materials have the characteristics of light weight, high strength, high durability and excellent fatigue resistance, and are ideal materials for overcoming the defects of easy oil leakage and low durability of viscous dampers. On the other hand, the inhaul cable made of the carbon fiber composite material has the characteristic of large elastic strain, and in the design bearing capacity range, the carbon fiber inhaul cable is always in an elastic state, so that elastic self-resetting capability can be provided for a structural system, and the resetting difficulty of a post-earthquake structure is reduced. The two characteristics can effectively improve the toughness performance of the large-span bridge, in particular the vibration control and the function recovery capability of the strong-vibration action structure for the normal use of the bridge.
In this embodiment, the temperature compensation element includes a shape memory alloy plate 211 and a stopper 212. As shown in fig. 2 and 3, when the shape memory alloy plate 211 is a temperature-reduced shape memory alloy plate, the temperature-reduced shape memory alloy plate can be deformed from an initial bent state to an extended state under the temperature reduction effect. Specifically, as can be seen from fig. 2, in the initial state, the cooling shape memory alloy plate 211 is in a curved state, two end portions of the curved cooling shape memory alloy plate 211 are abutted against the stopper 212, the elastic cable 22 passes through the cooling shape memory alloy plate 211 and the stopper 212, one end of the elastic cable 22 is provided with an anchor plate 221, the anchor plate 221 is abutted against a convex surface of the cooling shape memory alloy plate 211, and the cooling shape memory alloy plate 211 is clamped on the stopper 212 by the anchor plate 221. As shown in fig. 3, when the temperature reduction effect is received, the temperature reduction shape memory alloy plate 211 is deformed from the initial bent state to the extended state, and the temperature deformation amount d is released, at which time the temperature reduction shape memory alloy plate 211 is clamped between the anchor plate 221 and the stopper 212.
As shown in fig. 4 and 5, when the shape memory alloy plate 211 is a temperature-rising shape memory alloy plate, the temperature-rising shape memory alloy plate can be deformed from an initial extended state to a bent state by the temperature-rising action. Specifically, as can be seen from fig. 4, in the initial state, the temperature-raising shape memory alloy plate 211 is in an extended state, the extended temperature-raising shape memory alloy plate 211 is abutted against the upper and lower ends of the concave portion of the arc-shaped stopper 212, the elastic cable 22 passes through the temperature-raising shape memory alloy plate 211 and the stopper 212, one end of the elastic cable 22 is provided with an anchor plate 221, the anchor plate 221 is abutted against one surface of the temperature-raising shape memory alloy plate 211, and the temperature-raising shape memory alloy plate 211 is clamped on the stopper 212 by the anchor plate 221. As shown in fig. 5, when the temperature rise is affected, the temperature rise shape memory alloy plate 211 is deformed from the initial extended state to the bent state, the temperature rise shape memory alloy plate 211 in the bent state is fitted to the concave portion of the stopper 212, and the temperature deformation amount d is released, and at this time, the temperature rise shape memory alloy plate 211 is clamped between the anchor plate 221 and the stopper 212.
When in use, as shown in fig. 10, since the elastic inhaul cable 22 is not stressed when the damping device is required to be installed on one side between the bridge tower 3 and the main girder 4, which is close to the central axis of the bridge, namely, when the damping device is installed on the AB section in fig. 10, the shape memory alloy plate 211 is preferably a cooling shape memory alloy plate, at the moment, if the bridge is affected by cooling, the main girder 4 can shrink towards the middle part according to the principle of expansion caused by heat and contraction caused by cold, at the moment, the elastic inhaul cable 22 of the damping device is pulled, and the deformation d caused by cooling is released by utilizing the characteristic that the cooling shape memory alloy plate can be deformed from an initial bending state to an extending state under the cooling effect; when the damping device is required to be installed on one side, close to the end part of the main beam 4, between the bridge tower 3 and the main beam 4, namely, in the AC section of fig. 10, the shape memory alloy plate 211 is preferably a temperature-rising shape memory alloy plate, at this time, if the bridge is affected by temperature rising, the main beam 4 expands towards two ends according to the principle of thermal expansion and cold contraction, at this time, the elastic inhaul cable 22 of the device is pulled, and the deformation d caused by temperature rising is released by utilizing the characteristic that the temperature-rising shape memory alloy plate can be deformed from an initial expansion state to a bending state under the action of temperature rising. Typically, the shape memory alloy plate 211 is made of a two-way memory alloy material.
In this embodiment, the speed damper 1 is a viscous damper, and the damping effect can be adjusted according to the vibration frequency and the amplitude of the bridge by utilizing the characteristic that the damping force of the viscous damper changes along with the speed change, so as to achieve better vibration and noise reduction effects. The design displacement of the elastic inhaul cable 22 is larger than that of the speed damper 1, and by adopting the arrangement, the elastic inhaul cable 22 is prevented from being damaged before the speed damper 1, and the device can automatically reset by utilizing the elasticity of the elastic inhaul cable 22 after earthquake.
When the deformation amount of the single temperature compensation element is insufficient to release the temperature deformation amount, at least two temperature compensation elements can be used in a superposition mode until the deformation amount of the temperature compensation element is sufficient to release the temperature deformation amount, so that the damping device can adapt to more use scenes.
For ease of understanding, the fatigue life L of the speed damper 1 is generally related to the magnitude of the high-frequency repetitive load, the amount of displacement, and the frequency f of load application. Assuming the stiffness of the elastic cable 22 is K1, velocity dampingThe stiffness of the device 1 is K2, wherein K2 is related to the relative movement speed of the tower. When the structure bears high-frequency load F High Frequency At this time, the displacement decrease amount Δu=f of the speed damper 1 High Frequency * K1/(k2+k2), acting load decrease Δf High Frequency =k2/(k1+k2). The fatigue life improvement amount of the speed damper 1 can be estimated therefrom.
On the other hand, for controlling the damping device not to generate excessive deformation and ensuring that the damping device can automatically reset after earthquake, the damping device is required to provide damping force and also needs to provide certain self-resetting capability. The increase of the restoring force of the bridge toughness lifting combined damping limiting device is usually required to be not lower than 2.5% of the weight of the upper structure born by the bridge toughness lifting combined damping limiting device when the horizontal displacement is increased from 50% of the design displacement to the design displacement. Meanwhile, in order to ensure that the elastic inhaul cable 22 is not damaged before the speed damper 1, the design displacement of the elastic inhaul cable should be ensured to be not smaller than the design displacement of the speed damper 1. In summary, key parameters such as the length and the cross-sectional area of the elastic cable 22 can be designed based on the above two points.
Example 2
Unlike embodiment 1, in this embodiment, the compensation element 21 is a mechanical compensation element, as shown in fig. 6-9, the mechanical compensation element includes a rotating wheel 213, a tightening wheel 214, and a fixed wheel 215, the tightening wheel 214 is sleeved outside the rotating wheel 213, and the fixed wheel 215 is sleeved outside the tightening wheel 214.
Specifically, as shown in fig. 7, the rotating wheel 213 is in a ring shape with a notch 2131, and the elastic cable 22 is connected to the rotating wheel 213 and can drive the rotating wheel 213 to rotate around its axis.
As shown in fig. 8, the tightening wheel 214 has an irregular annular shape, an inward protruding portion 2142 is disposed in the tightening wheel 214, the shape and size of the inward protruding portion 2142 are matched with those of the notch 2131, and the inward protruding portion 2142 can be inserted into the notch 2131 and be driven by the rotating wheel 213 to perform a rotation motion together. External teeth 2141 are also provided on the outer surface of the tensioner 214.
As shown in fig. 9, the fixed wheel 215 has a circular ring shape, and a plurality of internal teeth 2151 are disposed in the fixed wheel 215, and when the internal teeth 2151 contact with the external teeth 2141, the internal teeth 2151 and the external teeth 2141 can be engaged and locked with each other, so as to limit the relative movement of the tightening wheel 214 and the fixed wheel 215. Under the action of low-frequency load, such as temperature load, the elastic guy cable 22 drives the rotating wheel 213 to rotate slowly, because the tightening wheel 214 is inserted into the notch 2131 of the rotating wheel 213 through the inner protruding part 2142, the rotating wheel 213 also drives the tightening wheel 214 to rotate slowly, at this time, the outer teeth 2141 of the tightening wheel 214 are separated from the inner teeth 2151 of the fixed wheel 215, so that the structure is in a loose state, the temperature deformation is completely released, when high-frequency load, such as vehicle or wind load, is applied, the elastic guy cable 22 drives the rotating wheel 213 to rotate quickly, because the tightening wheel 214 is inserted into the notch of the rotating wheel 213 through the inner protruding part 2142, namely, the tightening wheel 214 and the rotating wheel 213 are in a separable design, at this time, the rotating wheel 213 also drives the tightening wheel 214 to rotate quickly, and under the action of centrifugal force, the inner protruding part 2142 is thrown out from the notch 2131, at this time, the outer teeth 2141 and 2151 are limited to move relatively to the fixed wheel 215, because the inner protruding part 2142 is not completely thrown out, namely, the inner protruding part 2142 and the notch 2131 are in a semi-clutch state, so that the rotation of the elastic guy cable 213 is limited.
Example 3
As shown in fig. 10, the present invention further provides a bridge, which includes a bridge tower 3, a main beam 4, and the bridge toughness improving combined damping and limiting device in embodiment 1 or 2, wherein the elastic limiting combined damping and limiting device is disposed between the bridge tower 3 and the main beam 4.
The foregoing description of the preferred embodiments of the invention is not intended to limit the invention to the precise form disclosed, and is to be interpreted as illustrative only, as the invention may be modified and practiced in different but equivalent manners apparent to those skilled in the art having the benefit of the teachings herein.
Claims (10)
1. The utility model provides a bridge toughness promotes combination shock attenuation stop device, its characterized in that, includes speed damper (1) and elastic cable stop device, speed damper (1) with elastic cable stop device connects in parallel, elastic cable stop device includes compensation element (21) and elastic cable (22), compensation element (21) with elastic cable (22) establish ties, compensation element (21) can offset the influence of temperature secondary internal force.
2. The bridge toughness lifting combined damping limiting device according to claim 1, wherein the compensation element (21) is a temperature compensation element, the temperature compensation element comprises a shape memory alloy plate (211) and a stop piece (212), the shape memory alloy plate (211) can be converted into an extending state or a bending state from the extending state under the influence of temperature, one end of the elastic inhaul cable (22) is an anchor plate (221), the other end of the elastic inhaul cable (22) passes through the shape memory alloy plate (211) and the stop piece (212), one side of the shape memory alloy plate (211) is in butt joint with the anchor plate (221), and the other side of the shape memory alloy plate (211) is in butt joint with the stop piece (212).
3. The bridge toughness improving combined damping limiting device according to claim 2, wherein the number of the temperature compensation elements is at least two.
4. The bridge toughness lifting combined damping limiting device according to claim 2, wherein the shape memory alloy plate (211) is a cooling shape memory alloy plate, and the cooling shape memory alloy plate can be deformed from an initial bending state to an extending state under the cooling effect.
5. The bridge toughness lifting combined damping limiting device according to claim 2, wherein the shape memory alloy plate (211) is a temperature-rising shape memory alloy plate, and the temperature-rising shape memory alloy plate can be deformed from an initial stretching state to a bending state under the action of temperature rising.
6. The bridge toughness lifting combined damping limiting device according to claim 1, wherein the elastic inhaul cable (22) is made of carbon fiber composite materials.
7. The bridge toughness lifting combined damping limiting device according to claim 1, wherein the compensation element (21) is a mechanical compensation element, the mechanical compensation element comprises a rotating wheel (213), a tightening wheel (214) and a fixed wheel (215), the elastic guy cable (22) is connected with the rotating wheel (213) and drives the rotating wheel (213) to rotate, internal teeth (2151) are arranged in the fixed wheel (215), external teeth (2141) are arranged on the tightening wheel (214), the external teeth (2141) can be locked with the internal teeth (2151), relative movement of the tightening wheel (214) and the fixed wheel (215) is limited, a notch (2131) is arranged on the rotating wheel (213), an inner protrusion (2142) is arranged on the tightening wheel (214), the inner protrusion (2142) can be inserted into the notch (2131), the rotating wheel (213) is driven by the inner protrusion (2142) to rotate, the tightening wheel (214) is configured to be rapidly separated from the inner protrusion (2141) when the inner protrusion (2141) is rapidly separated from the rotating wheel (213) and the inner protrusion (2141) is rapidly separated from the outer protrusion (213), the external teeth (2141) mesh with the internal teeth (2151).
8. The bridge toughness lifting combined damping limiting device according to claim 1, wherein the design displacement of the elastic inhaul cable (22) is larger than the design displacement of the speed damper (1).
9. The bridge toughness lifting combined damping limiting device according to claim 1, wherein the speed damper (1) is a viscous damper.
10. Bridge comprising a bridge tower (3) and a main girder (4), characterized in that the bridge toughness lifting combined damping limiting device according to any one of claims 1-9 is used, and the bridge toughness lifting combined damping limiting device is arranged between the bridge tower (3) and the main girder (4).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310510291.8A CN116556175A (en) | 2023-05-08 | 2023-05-08 | Bridge toughness promotes combination shock attenuation stop device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310510291.8A CN116556175A (en) | 2023-05-08 | 2023-05-08 | Bridge toughness promotes combination shock attenuation stop device |
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| Publication Number | Publication Date |
|---|---|
| CN116556175A true CN116556175A (en) | 2023-08-08 |
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|---|---|---|---|
| CN202310510291.8A Pending CN116556175A (en) | 2023-05-08 | 2023-05-08 | Bridge toughness promotes combination shock attenuation stop device |
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| Country | Link |
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| CN (1) | CN116556175A (en) |
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2023
- 2023-05-08 CN CN202310510291.8A patent/CN116556175A/en active Pending
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