Multi-point combined intelligent restraint system and method for large-span cable-stayed bridge in high-intensity area

Abstract

The invention discloses a multi-point combined intelligent restraint system and method for a large-span cable-stayed bridge in a high-intensity area. The system comprises the cable-stayed bridge and an intelligent key restraint device arranged on the cable-stayed bridge. The intelligent key restraining device comprises an intelligent multifunctional energy consumption device arranged between a bridge tower and a main beam, a high-durability limiting energy consumption device and an anisotropic friction pendulum seismic mitigation and isolation support arranged between a bridge pier and the main beam. The speed of different static and dynamic loads is recognized through the intelligent multifunctional energy consumption device, three-level control over the cable-stayed bridge under the temperature load effect, the automobile and wind load effect and the earthquake load effect is achieved, and the longitudinal static and dynamic response of the large-span cable-stayed bridge is improved; the transverse static and dynamic response of the large-span cable-stayed bridge is subjected to two-stage control through the high-durability limiting energy consumption device and the anisotropic friction pendulum seismic mitigation and isolation support, the transverse static and dynamic response of the large-span cable-stayed bridge is improved, and multi-point combined intelligent constraint of the large-span cable-stayed bridge in a high-intensity area is achieved.

Description

Technical Field

[0001] The present invention belongs to the technical field of bridge engineering, and more specifically, relates to a multi-point combined intelligent restraint system and method for a long-span cable-stayed bridge in a high-intensity area. Background Art

[0002] The cable-stayed bridge is a modern bridge type with good economy and wide adaptability. It has now developed into the mainstream bridge type of large-span bridges. A reasonable structural system is a prerequisite to ensure the further development of the cable-stayed bridge.

[0003] For long-span cable-stayed bridges, both the floating system and the longitudinal rigid constraint system of the tower and beam have defects. From the perspective of static response: the floating system will cause large longitudinal displacement of the beam end and the tower top, and the bending moment at the bottom of the tower caused by the longitudinal static wind force and the braking force is also large; while the longitudinal rigid constraint system of the tower and beam can greatly reduce the longitudinal displacement of the beam end and the tower top, but the axial force of the main beam and the bending moment at the bottom of the tower caused by temperature changes are very large. From the perspective of seismic response: the internal force response of the main tower is small when the floating system is adopted, but the longitudinal displacement of the beam end and the tower top is large; while the longitudinal rigid constraint system of the tower and beam can reduce the displacement of the beam end and the tower top, but it will significantly increase the internal force response of the main tower. In terms of transverse, the structural requirements of the extra-large span cable-stayed bridge under the action of static, strong wind and earthquake are higher, especially under the action of transverse hundred-year wind and earthquake, the stress and deformation of the main beam are more unfavorable. In the current design of large-span bridges, wind-resistant bearings are usually set in the transverse direction between towers and beams. Because the wind-resistant bearings constrain the lateral relative displacement of the main beam and the bridge tower, the internal force and stress of the bridge main beam are relatively large under strong winds or earthquakes, the force is relatively unfavorable, and the scale of the foundation is further increased. These increase the difficulty of bridge design and restrict the development of long and large bridge technology.

[0004] Therefore, in order to comprehensively consider factors such as the large longitudinal displacement of the main beam and the large internal force response of the main tower structure under operational loads such as live load, temperature, wind and earthquake, as well as the relatively unfavorable force on the main beam when setting transverse wind-resistant supports in the design of large-span cable-stayed bridges in high-intensity areas at this stage, a reasonable multi-point combined intelligent constraint system and method for cable-stayed bridges is urgently needed to ensure the durability performance and functional requirements of cable-stayed bridges. Summary of the invention

[0005] In view of the above defects or improvement needs of the prior art, the present invention provides a multi-point combined intelligent constraint system and method for a large-span cable-stayed bridge in a high-intensity area. By setting an intelligent multifunctional power energy dissipation device in the longitudinal direction, a three-level control is performed on the longitudinal static and dynamic response of the large-span cable-stayed bridge. By setting a high-durability limit energy dissipation device and anisotropic friction pendulum seismic isolation bearing in the transverse direction, a two-level control is performed on the lateral static and dynamic response of the tower of the large-span cable-stayed bridge. This makes the force at each level of the large-span cable-stayed bridge clear and reasonable, improves the static and dynamic force performance of the large-span cable-stayed bridge in the high-intensity area, and improves the rationality and economy of the structural design of the large-span three-tower cable-stayed bridge.

[0006] In order to achieve the above-mentioned object, one aspect of the present invention provides a multi-point combined intelligent restraint system for a long-span cable-stayed bridge in a high-intensity zone, comprising a cable-stayed bridge and an intelligent key restraint device arranged on the cable-stayed bridge; wherein:

[0007] The cable-stayed bridge comprises two bridge towers arranged in parallel and at intervals, a main beam arranged on the two bridge towers, bridge piers arranged at the bottom of both ends of the main beam, and a plurality of groups of inclined cables symmetrically arranged on both sides of the bridge towers;

[0008] The intelligent key restraint device includes an intelligent multifunctional energy dissipation device and a high-durability position-limiting energy dissipation device arranged between the bridge tower and the main beam, and an anisotropic friction pendulum seismic isolation bearing arranged between the bridge pier and the main beam;

[0009] The intelligent multifunctional energy dissipation device is used to ensure the normal displacement of the main beam under the action of temperature load, limit the displacement of the main beam under the action of automobile and wind load, and limit the displacement of the main beam under earthquake conditions and realize energy dissipation;

[0010] The high-durability limited energy dissipation device can move freely in the longitudinal direction of the bridge and play an elastic constraint role in the transverse direction of the bridge; the anisotropic friction pendulum seismic isolation bearing can move freely in the longitudinal direction of the bridge and play a constraint role in the transverse direction of the bridge;

[0011] The intelligent multifunctional energy dissipation device is used to identify the speeds of different static and dynamic loads, thereby realizing three-level control of the cable-stayed bridge under the action of temperature load, automobile and wind load, and earthquake load, thereby improving the longitudinal static and dynamic response of the large-span cable-stayed bridge; the high-durability limited energy dissipation device and the anisotropic friction pendulum seismic isolation bearing are used to perform two-level control on the lateral static and dynamic response of the large-span cable-stayed bridge, thereby improving the lateral static and dynamic response of the large-span cable-stayed bridge and realizing multi-point combined intelligent constraint of the large-span cable-stayed bridge in high-intensity areas.

[0012] Furthermore, the intelligent multifunctional energy dissipation device comprises an intelligent speed locker and an E-type Chang'e steel damper connected in series with the intelligent speed locker;

[0013] The intelligent speed locker is connected to the crossbeam reaction seat of the bridge tower through a connecting seat, and the crossbeam reaction seat is fixedly connected to the crossbeam;

[0014] The E-type Chang'e steel damper is connected to the beam bottom reaction seat through a connecting seat, and the beam bottom reaction seat is fixedly connected to the main beam.

[0015] Furthermore, the anisotropic friction pendulum seismic isolation support 6 comprises an upper seat plate, a lower seat plate, and a spherical cap and a slide plate disposed between the upper seat plate and the lower seat plate;

[0016] Different groove lengths and curvature radii are arranged on the inner sides of the upper and lower seat plates of the anisotropic friction pendulum seismic isolation support 6, so that the vibration isolation period in the longitudinal direction of the bridge and the vibration isolation period in the transverse direction of the bridge are different, thereby realizing the seismic isolation design in the longitudinal direction of the bridge and the transverse direction of the bridge respectively;

[0017] The slide plate material is made of ultra-high performance polytetrafluoroethylene plate.

[0018] Furthermore, the anisotropic friction pendulum seismic isolation bearing 6 is also provided with shear pins; under extreme earthquake conditions, the shear pins are sheared off, and the bearing swings to dissipate energy.

[0019] Furthermore, the high-durability position-limiting energy-dissipating device comprises an upper seat plate and a lower seat plate which are arranged in parallel and at intervals, a sliding sleeve arranged at the center of the upper seat plate, and a plurality of columns arranged between the sliding sleeve and the lower seat plate;

[0020] The sliding sleeve connects all the columns in series.

[0021] Furthermore, longitudinal and transverse movable gaps are left between the upper seat plate and the sliding sleeve, and under normal load conditions, the sliding sleeve can move freely in the longitudinal and transverse directions; in extreme cases of earthquakes, when the sliding sleeve is displaced to the extreme position, the sliding sleeve moves with the upper seat plate and drives all the columns to deform horizontally, thereby realizing the shock-absorbing and energy-consuming function.

[0022] Furthermore, both ends of the stay cable are fixedly connected to the bridge tower and the main beam respectively;

[0023] A vertical support is provided between the cross beam and the main beam of the bridge tower.

[0024] The second aspect of the present invention provides a multi-point combined intelligent restraint method for a large-span cable-stayed bridge in a high-intensity area, which is implemented by applying the multi-point combined intelligent restraint system for a large-span cable-stayed bridge in a high-intensity area, and includes the following steps:

[0025] S1: An intelligent multifunctional energy dissipation device is arranged between the tower and the main beam of the cable-stayed bridge, and the cable-stayed bridge is subjected to three-level longitudinal control under the action of temperature load, vehicle and wind load, and earthquake load through the intelligent multifunctional energy dissipation device, thereby improving the longitudinal static and dynamic response of the long-span cable-stayed bridge;

[0026] S2: a high-durability limit energy dissipation device is provided between the tower and the main beam of the cable-stayed bridge, and an anisotropic friction pendulum seismic isolation bearing is provided between the pier and the main beam of the cable-stayed bridge, and the lateral static and dynamic response of the long-span cable-stayed bridge is controlled in two levels by the high-durability limit energy dissipation device and the anisotropic friction pendulum seismic isolation bearing;

[0027] S3: By improving the longitudinal static and dynamic response and lateral static and dynamic response of the long-span cable-stayed bridge, the multi-point combined intelligent constraint of the long-span cable-stayed bridge in the high-intensity area is completed.

[0028] Furthermore, in step S1, the three-level longitudinal control of the cable-stayed bridge under temperature load, vehicle and wind load, and earthquake load is performed by the intelligent multifunctional energy dissipation device to improve the longitudinal static and dynamic response of the long-span cable-stayed bridge, including:

[0029] Setting a speed threshold of the intelligent speed locker of the intelligent multifunctional energy dissipation device to determine whether the relative deformation speed between the bridge tower and the main beam is less than the speed threshold;

[0030] If so, the intelligent speed locker is set to a free state, so as to release the structural deformation under the temperature load as a longitudinal floating system, thereby reducing the internal force of the structure;

[0031] If not, the intelligent speed locker is set to a locked state; under the action of automobile and wind loads, the E-type Chang'e steel damper does not yield, and as an elastic constraint system, it provides reasonable additional stiffness to control the structural force and main beam displacement; under the action of seismic loads, the E-type Chang'e steel damper yields, exerts a dynamic damping effect, and reduces the dynamic response of the structure.

[0032] Furthermore, the two-level control of the lateral static and dynamic response of the long-span cable-stayed bridge by the high-durability limiting energy dissipation device and the anisotropic friction pendulum seismic isolation bearing described in step S2 includes:

[0033] Under the action of static load, the high-durability limited energy dissipation device only undergoes elastic deformation, and the shear pins of the anisotropic friction pendulum seismic isolation bearing are not sheared off, providing stable horizontal stiffness and controlling the lateral deformation of the bridge under live load crosswind and centennial crosswind;

[0034] Under the action of seismic load, the high-durability limit energy dissipation device enters plastic deformation to dissipate seismic energy, the shear pins of the anisotropic friction pendulum seismic isolation bearing are sheared off, the bearing swings to dissipate energy, and the seismic response of the structure is reduced.

[0035] In general, the above technical solutions conceived by the present invention can achieve the following beneficial effects compared with the prior art:

[0036] (1) The multi-point combined intelligent constraint system and method of a long-span cable-stayed bridge in a high-seismic zone of the present invention controls the longitudinal beam end displacement of the long-span cable-stayed bridge under static and dynamic action by setting an intelligent multifunctional energy dissipation device between the tower and the beam, reduces the scale of the telescopic device, improves the internal force response of the structure under static and dynamic action, and improves the seismic performance of the long-span cable-stayed bridge; a high-durability limited energy dissipation device is set laterally between the tower and the beam and a two-stage design is adopted, which can control the lateral deformation of the bridge under live load crosswind and century-long crosswind under static action; Under the action of earthquake, the high-durability limited energy dissipation device can play a shock-absorbing and energy-absorbing role, and improve the structural stress performance; anisotropic friction pendulum seismic isolation bearings are arranged laterally between piers and beams and a two-stage design is adopted to limit the lateral deformation of the main beam under static action; under the action of earthquake, it plays a shock-absorbing and energy-absorbing role, and improves the stress performance of the piers; the present invention can solve the problem of poor longitudinal and lateral seismic performance of large-span cable-stayed bridges, make the forces at all levels of large-span cable-stayed bridges clear and reasonable, and improve the rationality and economy of the structural design of large-span cable-stayed bridges.

[0037] (2) The present invention provides a multi-point combined intelligent constraint system and method for a large-span cable-stayed bridge in a high-intensity area. The intelligent multifunctional energy dissipation device identifies the type of load acting on the bridge, such as temperature load, vehicle load, wind load or earthquake load, based on parameters such as the vibration speed and frequency of the bridge. By analyzing the identified load type and performing multi-level control on the longitudinal load of the bridge, the displacement of the beam end of the large-span cable-stayed bridge under static and dynamic action is effectively controlled, the scale of the telescopic device is reduced, and the structural stress performance of the bridge structure under static and dynamic action is improved through intelligent control and energy dissipation. The E-type Chang'e steel damper and the high-durability limit energy dissipation device of the intelligent multifunctional energy dissipation device are both made of Chang'e steel material, which has excellent ductility and energy absorption, can improve the energy dissipation capacity and low-cycle fatigue performance of the damper, and has good durability and economy. It can be promoted and applied to other bridge types such as large-span cable-stayed bridges in high-intensity areas, and has a wide range of applications. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1 This is a structural schematic diagram of a multi-point combined intelligent restraint system for a long-span cable-stayed bridge in a high-intensity zone according to an embodiment of the present invention;

[0039] Figure 2 This is a schematic cross-sectional diagram of the connection between the main beam and the bridge tower of a multi-point combined intelligent restraint system of a long-span cable-stayed bridge in a high-intensity area according to an embodiment of the present invention;

[0040] Figure 3 This is a structural schematic diagram of an intelligent multifunctional energy dissipation device of a multi-point combined intelligent restraint system for a long-span cable-stayed bridge in a high-intensity area according to an embodiment of the present invention;

[0041] Figure 4This is a structural schematic diagram of a high-durability position-limiting energy-dissipating device of a multi-point combined intelligent restraint system of a long-span cable-stayed bridge in a high-intensity zone according to an embodiment of the present invention;

[0042] Figure 5 It is a schematic cross-sectional structure diagram of an anisotropic friction pendulum seismic isolation bearing of a multi-point combined intelligent restraint system of a long-span cable-stayed bridge in a high-intensity area according to an embodiment of the present invention;

[0043] Figure 6 The present invention is a flowchart of a multi-point combined intelligent constraint method for a large-span cable-stayed bridge in a high-intensity zone according to an embodiment of the present invention.

[0044] In all the drawings, the same figure marks represent the same technical features, specifically: 1-cable-stayed bridge, 11-bridge tower, 12-bridge pier, 13-main beam, 14-cable-stayed cable, 111-cross beam, 2-intelligent key constraint device, 3-vertical support, 4-intelligent multifunctional energy dissipation device, 41-intelligent speed locker, 42-E-type Chang'e steel damper, 43-connecting seat, 44-beam bottom reaction seat, 5-high durability limit energy dissipation device, 51-upper seat plate, 52-lower seat plate, 53-sliding sleeve, 54-column, 6-anisotropic friction pendulum seismic isolation bearing. DETAILED DESCRIPTION

[0045] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention. In addition, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0046] Considering the large longitudinal displacement of the main beam and the large internal force response of the main tower structure under the operation loads such as live load, temperature, wind and earthquake, as well as the relatively unfavorable main beam stress when setting the transverse wind-resistant bearing in the design of large-span cable-stayed bridges in high-intensity areas at present, such as Figure 1-Figure 5As shown, one aspect of the present invention provides a multi-point combined intelligent constraint system for a long-span cable-stayed bridge in a high-intensity area, which performs multi-point combined intelligent constraints on a long-span cable-stayed bridge in a high-intensity area. The system includes a cable-stayed bridge 1 and an intelligent key constraint component 2 arranged on the cable-stayed bridge 1; the cable-stayed bridge 1 includes two bridge towers 11 arranged in parallel and at intervals, a main beam 13 arranged on the two bridge towers 11, bridge piers 12 arranged at the bottom of both ends of the main beam 13, and a plurality of groups of inclined cables 14 symmetrically arranged on both sides of the bridge tower 11; the two ends of the inclined cables 14 are fixedly connected to the bridge tower 11 and the main beam 13 respectively, and the load of the main beam is balanced by tension; the cross beam 111 of the bridge tower 11 and the main beam 13 are connected between the cross beam 111 and the main beam 13 A vertical support 3 is provided to allow the main beam 13 to move in the horizontal direction; the main beam 13 is supported on the bridge tower 11 through the vertical support 3; the intelligent key constraint component 2 includes an intelligent multifunctional energy dissipation device 4 and a high-durability limit energy dissipation device 5 arranged between the cross beam 111 of the bridge tower 11 and the main beam 13, and an anisotropic friction pendulum seismic isolation support 6 arranged between the pier 12 and the main beam 13; the present invention works through the coordinated operation of the intelligent multifunctional energy dissipation device 4, the high-durability limit energy dissipation device 5 and the anisotropic friction pendulum seismic isolation support 6, which automatically adjust under different load conditions to adapt to the dynamic response of the bridge structure, thereby improving the longitudinal and lateral static and dynamic responses of the bridge.

[0047] Furthermore, if Figure 1-Figure 5 As shown, the main beam 13 is supported on the pier 12 through an anisotropic friction pendulum seismic isolation bearing 4; the intelligent multifunctional energy dissipation device 4 is arranged at the intersection of the bridge tower 11 and the main beam 13 along the longitudinal direction of the cable-stayed bridge 1, and the intelligent multifunctional energy dissipation device 4 can not only ensure the normal displacement of the main beam 13 under the action of temperature load, but also ensure that the displacement of the main beam 13 is limited and energy is consumed under the action of loads such as automobiles, wind and earthquakes, thereby reducing the structural response of the cable-stayed bridge 1; the high-durability limiting energy dissipation device 5 is arranged at the intersection of the bridge tower 11 and the main beam 13, wherein the high-durability limiting energy dissipation device 5 can move freely in the longitudinal direction of the bridge and play an elastic constraint role in the transverse direction of the bridge; the anisotropic friction pendulum seismic isolation bearing 6 is arranged at the intersection of the pier 12 and the main beam 13, which can move freely in the longitudinal direction of the bridge and play a constraint role in the transverse direction of the bridge.

[0048] Furthermore, if Figure 1-Figure 5As shown, the intelligent multifunctional energy dissipation device 4 includes an intelligent speed locker 41 and an E-type Chang'e steel damper 42 connected in series with the intelligent speed locker 41; the intelligent speed locker 41 is connected to the beam reaction seat of the bridge tower 11 through a connecting seat, and the beam reaction seat is fixedly connected to the beam 111; the E-type Chang'e steel damper 42 is connected to the beam bottom reaction seat 44 through a connecting seat 43, and the beam bottom reaction seat 44 is fixedly connected to the main beam 13. The E-type Chang'e steel damper 42 is made of Chang'e steel material, which has excellent ductility and energy absorption.

[0049] Furthermore, if Figure 1-Figure 5 As shown, the anisotropic friction pendulum seismic isolation bearing 6 includes an upper seat plate, a lower seat plate, and a spherical cap and a slide plate arranged between the upper seat plate and the lower seat plate; wherein the slide plate can prevent the bearing steel from rubbing against the steel to ensure the normal function of the bearing, and can convert the earthquake energy into a part of the heat energy; the swing between the upper seat plate, the lower seat plate and the spherical cap can convert the earthquake energy into a part of the potential energy and kinetic energy, so as to reduce the dynamic response of the bridge and improve the safety and durability of the bridge; the upper seat plate and the lower seat plate of the anisotropic friction pendulum seismic isolation bearing 6 are provided with different groove lengths and curvature radii, so that The vibration isolation period in the longitudinal direction of the bridge is different from that in the transverse direction of the bridge, thereby realizing the isolation design of the longitudinal direction of the bridge and the transverse direction of the bridge respectively; the slide plate adopts an ultra-high performance polytetrafluoroethylene plate, which can realize long-distance sliding without silicone grease, and has the advantages of ultra-wear resistance, low wear, self-lubrication, and resistance to rapid shear; the anisotropic friction pendulum seismic isolation bearing 6 is also provided with shear pins, which can provide the restraint force required for static working conditions under normal circumstances. In extreme cases, such as strong earthquakes, the shear pins are designed to be sheared off. Once sheared off, the bearing can swing, thereby dissipating seismic energy.

[0050] Furthermore, if Figure 1-Figure 5 As shown, the high-durability position-limiting energy-dissipating device 5 comprises an upper seat plate 51 and a lower seat plate 52 which are arranged in parallel and at intervals, a sliding sleeve 53 arranged at the center of the upper seat plate 51, and a plurality of columns 54 arranged between the sliding sleeve 53 and the lower seat plate 52; the sliding sleeve 53 connects all the columns 54 in series so that the columns 54 are subjected to force at the same time; a longitudinal and transverse movable gap is left between the upper seat plate 51 and the sliding sleeve 53, and under normal load conditions, the sliding sleeve 53 can move freely in the longitudinal and transverse directions; in the extreme case of an earthquake, when the sliding sleeve 53 is displaced to the extreme position, the upper seat plate 51 limits the movement of the sliding sleeve 53, so that the sliding sleeve 53 moves with the upper seat plate 51, and the sliding sleeve 53 drives all the columns 54 to deform horizontally, thereby realizing the shock-absorbing and energy-dissipating function; the high-durability position-limiting energy-dissipating device is made of Chang'e steel material, which has excellent ductility and energy absorption.

[0051] The multi-point combined intelligent constraint system for a large-span cable-stayed bridge in a high-intensity area of ​​the present invention can identify the speeds of different static and dynamic loads through the intelligent multifunctional energy dissipation device 4, thereby realizing three-level control of the cable-stayed bridge under the action of temperature load, automobile and wind load, and earthquake load, thereby improving the longitudinal static and dynamic response of the large-span cable-stayed bridge; the lateral static and dynamic response of the large-span cable-stayed bridge can be controlled in two levels through the high-durability limiting energy dissipation device 5 and the anisotropic friction pendulum seismic isolation bearing 6, thereby improving the lateral static and dynamic response of the large-span cable-stayed bridge.

[0052] like Figure 6 As shown, the second aspect of the present invention provides a multi-point combined intelligent restraint method for a large-span cable-stayed bridge in a high-intensity area, which is implemented by applying the multi-point combined intelligent restraint system for a large-span cable-stayed bridge in a high-intensity area, and includes the following steps:

[0053] S1: An intelligent multifunctional energy dissipation device 4 is arranged between the tower 11 and the main beam 13 of the cable-stayed bridge 1, and the intelligent multifunctional energy dissipation device 4 is used to perform three-level longitudinal control on the cable-stayed bridge 1 under the action of temperature load, vehicle and wind load, and earthquake load, so as to improve the longitudinal static and dynamic response of the long-span cable-stayed bridge;

[0054] S2: a high-durability position-limiting energy-dissipating device 5 is provided between the bridge tower 11 and the main beam 13 of the cable-stayed bridge 1, and an anisotropic friction pendulum seismic isolation bearing 6 is provided between the bridge pier 12 and the main beam 13 of the cable-stayed bridge 1, and the lateral static and dynamic response of the long-span cable-stayed bridge is controlled in two levels by the high-durability position-limiting energy-dissipating device 5 and the anisotropic friction pendulum seismic isolation bearing 6, so as to improve the lateral static and dynamic response of the long-span cable-stayed bridge;

[0055] S3: By improving the longitudinal static and dynamic response and lateral static and dynamic response of the long-span cable-stayed bridge, the multi-point combined intelligent constraint of the long-span cable-stayed bridge in the high-intensity area is completed.

[0056] Furthermore, in step S1, the intelligent multifunctional energy dissipation device 4 performs three-level longitudinal control on the cable-stayed bridge 1 under temperature load, vehicle and wind load, and earthquake load to improve the longitudinal static and dynamic response of the long-span cable-stayed bridge, including:

[0057] Setting a speed threshold of the intelligent speed locker 41 of the intelligent multifunctional energy dissipation device 4 to determine whether the relative deformation speed between the bridge tower 11 and the main beam 13 is less than the speed threshold;

[0058] If so, the intelligent speed locker 41 is set to a free state, so as to release the structural deformation under the temperature load as a longitudinal floating system and reduce the internal force of the structure;

[0059] If not, the intelligent speed locker 41 is set to a locked state; under the action of automobile and wind loads, the E-type Chang'e steel damper 42 does not yield, and as an elastic constraint system, it provides reasonable additional stiffness to control the structural force and main beam displacement; under the action of seismic loads, the E-type Chang'e steel damper yields, exerts a dynamic damping effect, and reduces the dynamic response of the structure.

[0060] Further: the two-level control of the lateral static and dynamic response of the long-span cable-stayed bridge by the high-durability limiting energy dissipation device 5 and the anisotropic friction pendulum seismic isolation bearing 6 in step S2 to improve the lateral static and dynamic response of the long-span cable-stayed bridge includes:

[0061] Under the action of static load, the high-durability limit energy dissipation device 5 only undergoes elastic deformation, and the shear pins of the anisotropic friction pendulum seismic isolation bearing 6 are not sheared off, providing stable horizontal stiffness and controlling the lateral deformation of the bridge under live load crosswind and centennial crosswind;

[0062] Under the action of earthquake load, the high-durability limit energy dissipation device 5 enters plastic deformation to dissipate earthquake energy, the shear pins of the anisotropic friction pendulum seismic isolation bearing 6 are sheared off, the bearing swings to dissipate energy, and the earthquake response of the structure is reduced.

[0063] The invention discloses a multi-point combined intelligent constraint system and method for a long-span cable-stayed bridge in a high-intensity zone. An intelligent multifunctional energy dissipation device is arranged between towers and beams to control the longitudinal beam end displacement of the long-span cable-stayed bridge under static and dynamic action, reduce the scale of the telescopic device, improve the internal force response of the structure under static and dynamic action, and improve the seismic performance of the long-span cable-stayed bridge. A high-durability limiting energy dissipation device is arranged transversely between towers and beams and a two-stage design is adopted. Under static action, the lateral deformation of the bridge under live load crosswind and century-old crosswind can be controlled. Under earthquake action, the high-durability limiting energy dissipation device can play a shock-absorbing and energy-absorbing role and improve the structural stress performance. An anisotropic friction pendulum seismic isolation support is arranged transversely between piers and beams and a two-stage design is adopted. Under static action, the lateral deformation of the main beam is limited. Under earthquake action, the shock-absorbing and energy-absorbing role is played to improve the stress performance of the bridge pier. The invention can solve the problem of poor longitudinal and transverse seismic performance of long-span cable-stayed bridges, make the forces at each level of the long-span cable-stayed bridge clear and reasonable, and improve the rationality and economy of the structural design of the long-span cable-stayed bridge.

[0064] It will be easily understood by those skilled in the art that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A multi-point combined intelligent restraint system for a long-span cable-stayed bridge in a high-intensity area, characterized by: The invention comprises a cable-stayed bridge (1) and an intelligent key restraint device (2) arranged on the cable-stayed bridge (1); wherein: The cable-stayed bridge (1) comprises two bridge towers (11) arranged in parallel and spaced apart, a main beam (13) arranged on the two bridge towers (11), bridge piers (12) arranged at the bottom of both ends of the main beam (13), and a plurality of groups of inclined cables (14) symmetrically arranged on both sides of the bridge tower (11); The intelligent key restraint device (2) comprises an intelligent multifunctional energy dissipation device (4) and a high-durability position-limiting energy dissipation device (5) arranged between the bridge tower (11) and the main beam (13), and an anisotropic friction pendulum seismic isolation support (6) arranged between the bridge pier (12) and the main beam (13); The intelligent multifunctional energy dissipation device (4) is used to ensure the normal displacement of the main beam (13) under the action of temperature load, to limit the displacement of the main beam (13) under the action of automobile and wind load, and to limit the displacement of the main beam (13) and achieve energy dissipation under earthquake conditions; The high-durability position-limiting energy-dissipating device (5) can move freely in the longitudinal direction of the bridge and play an elastic restraining role in the transverse direction of the bridge; the anisotropic friction pendulum seismic isolation support (6) can move freely in the longitudinal direction of the bridge and play a restraining role in the transverse direction of the bridge; The intelligent multifunctional energy dissipation device (4) is used to identify the speeds of different static and dynamic loads, thereby realizing three-level control of the cable-stayed bridge under the action of temperature load, automobile and wind load, and earthquake load, thereby improving the longitudinal static and dynamic response of the long-span cable-stayed bridge; the high-durability limited energy dissipation device (5) and the anisotropic friction pendulum seismic isolation bearing (6) are used to perform two-level control on the lateral static and dynamic response of the long-span cable-stayed bridge, thereby improving the lateral static and dynamic response of the long-span cable-stayed bridge, and realizing multi-point combined intelligent constraint of the long-span cable-stayed bridge in high-intensity areas.

2. According to claim 1, a multi-point combined intelligent constraint method for a long-span cable-stayed bridge in a high-intensity area is characterized by: The intelligent multifunctional energy dissipation device (4) comprises an intelligent speed locker (41) and an E-shaped Chang'e steel damper (42) connected in series with the intelligent speed locker (41); The intelligent speed locker (41) is connected to the crossbeam reaction seat of the bridge tower (11) through a connecting seat, and the crossbeam reaction seat is fixedly connected to the crossbeam (111); The E-shaped Chang'e steel damper (42) is connected to the beam bottom reaction seat (44) via a connecting seat (43), and the beam bottom reaction seat (44) is fixedly connected to the main beam (13).

3. The multi-point combined intelligent constraint method for a long-span cable-stayed bridge in a high-intensity area according to claim 1 is characterized by: The anisotropic friction pendulum seismic isolation support 6 comprises an upper seat plate, a lower seat plate, and a spherical cap and a slide plate arranged between the upper seat plate and the lower seat plate; Different groove lengths and curvature radii are arranged on the inner sides of the upper and lower seat plates of the anisotropic friction pendulum seismic isolation support 6, so that the vibration isolation period in the longitudinal direction of the bridge and the vibration isolation period in the transverse direction of the bridge are different, thereby realizing the seismic isolation design in the longitudinal direction of the bridge and the transverse direction of the bridge respectively; The slide plate material is made of ultra-high performance polytetrafluoroethylene plate.

4. The multi-point combined intelligent constraint method for a long-span cable-stayed bridge in a high-intensity area according to claim 3 is characterized by: The anisotropic friction pendulum seismic isolation support 6 is also provided with shear pins; the shear pins are sheared off under extreme earthquake conditions, and the support swings to dissipate energy.

5. The multi-point combined intelligent constraint method for a long-span cable-stayed bridge in a high-intensity area according to claim 1 is characterized by: The high-durability position-limiting energy-dissipating device (5) comprises an upper seat plate (51) and a lower seat plate (52) which are arranged in parallel and spaced apart, a sliding sleeve (53) arranged at the center of the upper seat plate (51), and a plurality of columns (54) arranged between the sliding sleeve (53) and the lower seat plate (52); The sliding sleeve (53) connects all the columns (54) in series.

6. The multi-point combined intelligent constraint method for a long-span cable-stayed bridge in a high-intensity area according to claim 5 is characterized by: A longitudinal and transverse movable gap is left between the upper seat plate (51) and the sliding sleeve (53), and under normal load conditions, the sliding sleeve (53) can freely move in the longitudinal and transverse directions; in the extreme case of an earthquake, when the sliding sleeve (53) is displaced to an extreme position, the sliding sleeve (53) moves together with the upper seat plate (51) and drives all the columns (54) to deform horizontally, thereby realizing a shock-absorbing and energy-dissipating function.

7. A multi-point combined intelligent constraint method for a long-span cable-stayed bridge in a high-intensity zone according to any one of claims 1 to 6, characterized in that: The two ends of the inclined cable (14) are fixedly connected to the bridge tower (11) and the main beam (13) respectively; A vertical support (3) is provided between the cross beam (111) and the main beam (13) of the bridge tower (11).

8. A multi-point combined intelligent constraint method for a long-span cable-stayed bridge in a high-intensity area, characterized by: The method is implemented by using a multi-point combined intelligent restraint system for a long-span cable-stayed bridge in a high-intensity area according to any one of claims 1 to 7, comprising the following steps: S1: An intelligent multifunctional energy dissipation device (4) is arranged between a bridge tower (11) and a main beam (13) of a cable-stayed bridge (1), and the intelligent multifunctional energy dissipation device (4) is used to perform three-level longitudinal control on the cable-stayed bridge (1) under the action of temperature load, vehicle and wind load, and earthquake load, thereby improving the longitudinal static and dynamic response of the long-span cable-stayed bridge; S2: a high-durability position-limiting energy-dissipating device (5) is provided between a bridge tower (11) and a main beam (13) of a cable-stayed bridge (1), and an anisotropic friction pendulum seismic isolation bearing (6) is provided between a bridge pier (12) and a main beam (13) of the cable-stayed bridge (1), and a two-level control is performed on the lateral static and dynamic response of the long-span cable-stayed bridge by means of the high-durability position-limiting energy-dissipating device (5) and the anisotropic friction pendulum seismic isolation bearing (6); S3: By improving the longitudinal static and dynamic response and lateral static and dynamic response of the long-span cable-stayed bridge, the multi-point combined intelligent constraint of the long-span cable-stayed bridge in the high-intensity area is completed.

9. The multi-point combined intelligent constraint method for a long-span cable-stayed bridge in a high-intensity area according to claim 8 is characterized by: In step S1, the intelligent multifunctional energy dissipation device (4) is used to perform three-level longitudinal control on the cable-stayed bridge (1) under the action of temperature load, vehicle and wind load, and earthquake load, thereby improving the longitudinal static and dynamic response of the long-span cable-stayed bridge, including: Setting a speed threshold of the intelligent speed locker (41) of the intelligent multifunctional energy dissipation device (4) to determine whether the relative deformation speed between the bridge tower (11) and the main beam (13) is less than the speed threshold; If so, the intelligent speed locker (41) is set to a free state, so as to release the structural deformation under the temperature load as a longitudinal floating system, thereby reducing the internal force of the structure; If not, the intelligent speed locker (41) is set to a locked state; under the action of automobile and wind loads, the E-type Chang'e steel damper (42) does not yield, and as an elastic constraint system, it provides reasonable additional stiffness to control the structural force and main beam displacement; under the action of seismic loads, the E-type Chang'e steel damper yields, exerts a dynamic damping effect, and reduces the dynamic response of the structure.

10. The multi-point combined intelligent constraint method for a long-span cable-stayed bridge in a high-intensity area according to claim 8 is characterized by: The step S2 includes performing two-level control on the lateral static and dynamic response of the long-span cable-stayed bridge by using the high-durability limiting energy dissipation device (5) and the anisotropic friction pendulum seismic isolation bearing (6), including: Under the action of static load, the high-durability limited energy dissipation device (5) only undergoes elastic deformation, and the shear pins of the anisotropic friction pendulum seismic isolation bearing (6) are not sheared off, thereby providing stable horizontal stiffness and controlling the lateral deformation of the bridge under live load crosswind and century-long crosswind; Under the action of earthquake load, the high-durability limited energy dissipation device (5) enters into plastic deformation to dissipate earthquake energy, the shear pins of the anisotropic friction pendulum seismic isolation support (6) are sheared off, the support swings to dissipate energy, and the earthquake response of the structure is reduced.

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