CN111074776A - Novel reasonable anti-seismic system structure of suspension bridge in high-intensity earthquake area - Google Patents
Novel reasonable anti-seismic system structure of suspension bridge in high-intensity earthquake area Download PDFInfo
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- CN111074776A CN111074776A CN202010034371.7A CN202010034371A CN111074776A CN 111074776 A CN111074776 A CN 111074776A CN 202010034371 A CN202010034371 A CN 202010034371A CN 111074776 A CN111074776 A CN 111074776A
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- bridge
- earthquake
- tower
- suspension bridge
- seismic
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D19/00—Structural or constructional details of bridges
- E01D19/14—Towers; Anchors ; Connection of cables to bridge parts; Saddle supports
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D19/00—Structural or constructional details of bridges
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D19/00—Structural or constructional details of bridges
- E01D19/16—Suspension cables; Cable clamps for suspension cables ; Pre- or post-stressed cables
Abstract
The invention discloses a novel reasonable earthquake-resistant system structure of a suspension bridge in a high-intensity earthquake area, which is characterized in that: the method is characterized in that a protection system formed by a corrugated steel web combined cross beam, a viscous damper between tower beams and energy-consuming central buckles between cable beams is adopted, and 3 pairs of central buckles are arranged in a main span of the suspension bridge to disperse the concentrated force of the central buckles acting on a main beam as much as possible; and meanwhile, a longitudinal viscous damper is arranged between the tower beams. The anti-seismic performance of the bridge tower is improved through the measures, the rigidity of each component of the bridge is coordinated and matched, and the seismic energy is actively consumed, so that the aim of improving the comprehensive anti-seismic performance of the full bridge is fulfilled, and the field that the large-span suspension bridge in the seismic area of the high-intensity area adopts the reinforced concrete bridge tower is expanded.
Description
Technical Field
The invention relates to the field of suspension bridge earthquake resistance, in particular to a reasonable novel earthquake-resistant system structure adopting a reinforced concrete bridge tower for a large-span suspension bridge in a high-intensity earthquake area.
Background
The suspension bridge is a flexible structure with good anti-seismic performance, when a reinforced concrete bridge tower is adopted in a high-intensity earthquake area, although the suspension bridge is economical and durable, the earthquake response is large, the earthquake resistance of the suspension bridge is difficult to meet the requirement, and particularly, when the span is large and the bridge tower is high, the application of the reinforced concrete bridge tower is restricted. At present, a thousand-meter-level suspension bridge tower in a foreign high-intensity earthquake area usually adopts a steel tower with lighter weight so as to meet the requirement of earthquake resistance, but the steel tower has higher manufacturing cost and is difficult to apply in mountainous areas with inconvenient transportation.
By relying on design projects of the Yaan-Kangding highway Luding river-crossing grand bridge, the anti-seismic problem of the reinforced concrete bridge tower of the kilometric-scale suspension bridge in the severe seismic region is comprehensively researched, the limitation of adopting the steel tower in the past is broken through, and the adoption of the concrete bridge tower in the ultra-large span suspension bridge in the high-intensity seismic region becomes possible.
Disclosure of Invention
Therefore, in order to solve the above defects, the invention provides a novel reasonable anti-seismic system structure of a suspension bridge in a high-intensity seismic area, and a protection system formed by a corrugated steel web combined beam, a viscous damper between tower beams and an energy-consuming central buckle between cable beams is innovatively applied, so that the anti-seismic performance of a bridge tower is improved, the rigidity of each component of the bridge is coordinated and matched, and the seismic energy is actively consumed, so that the purpose of improving the comprehensive anti-seismic performance of a full bridge is achieved, and the field that a large-span suspension bridge in the high-intensity seismic area adopts a reinforced concrete bridge tower is expanded.
The invention is realized in this way, a new reasonable earthquake-proof system structure of suspension bridge in high intensity earthquake area is constructed, which is characterized in that: the protection system formed by the corrugated steel web combined cross beam, the viscous damper between the tower beams and the energy-consuming central buckle between the cable beams is adopted, the anti-seismic performance of the bridge tower is improved, the rigidity of each component of the bridge is coordinated and matched, and the seismic energy is actively consumed, so that the purpose of improving the comprehensive anti-seismic performance of the full bridge is achieved, and the field that the reinforced concrete bridge tower is adopted in the large-span suspension bridge in the seismic region of the high-intensity area is expanded.
The invention relates to a novel reasonable earthquake-resistant system structure of a suspension bridge in a high-intensity earthquake area, which is characterized in that: 3 pairs of central buckles are arranged in the main span of the suspension bridge to disperse the concentrated force of the central buckles on the main beam as much as possible; and meanwhile, a longitudinal viscous damper is arranged between the tower beams.
The invention relates to a novel reasonable earthquake-resistant system structure of a suspension bridge in a high-intensity earthquake area, which is characterized in that: the longitudinal viscous damper is respectively connected with the bridge tower and the main beam.
The invention relates to a novel reasonable earthquake-resistant system structure of a suspension bridge in a high-intensity earthquake area, which is characterized in that: the energy dissipation member bar is used as a main component of the central button, is a displacement-related energy dissipater, such as various types of buckling-restrained brace member bars, has stable and full hysteretic energy dissipation performance, is required to achieve full-section yielding when being tensioned and compressed, and has equivalent bearing capacity to the tensioned bearing capacity, so that hysteretic energy dissipation effect of steel is fully exerted.
The invention relates to a novel reasonable earthquake-resistant system structure of a suspension bridge in a high-intensity earthquake area, which is characterized in that: the upper end of the energy consumption rod piece is hinged with the cable clamp corresponding to the main cable, and the lower end of the energy consumption rod piece is hinged with the steel truss girder ear plate.
The invention relates to a novel reasonable earthquake-resistant system structure of a suspension bridge in a high-intensity earthquake area, which is characterized in that: the energy dissipation rod piece comprises a double-fork lug, a thin nut, an adjusting nut, a lifting lug, a material core, ZH mortar and a constraint sleeve; the constraint sleeve wraps the outer side of ZH mortar to form a constraint unit of the energy consumption rod piece, so that the material core is always approximately in an axial tension and compression state. Arranging a material core in ZH mortar, wherein the material core is generally made of low-yield-point steel to form a main body structure of an energy-consuming rod piece, arranging double fork lugs at two ends of the main body structure through thin nuts and adjusting nuts, and arranging lifting lugs at the outer side of the main body structure; and a non-adhesive coating is arranged between the constraint unit and the core to form a sliding mechanism unit.
The invention relates to a novel reasonable earthquake-resistant system structure of a suspension bridge in a high-intensity earthquake area, which is characterized in that: the beam adopts a combined structure of the corrugated steel web and the prestressed concrete top and bottom plates, and the corrugated steel web replaces the concrete web of a common concrete box beam in the structure, so that the dead weight of the beam is reduced, and meanwhile, due to the wrinkle effect of the corrugated steel web, the axial direction and the bending rigidity of the beam are greatly reduced, so that the self-vibration period of the structure can be prolonged, and the earthquake force is reduced.
The invention has the following advantages: the invention discloses a reasonable suspension bridge multipoint dispersed seismic isolation system and constraint system in a high-intensity seismic area, a protection system formed by a corrugated steel web combined beam, a viscous damper between tower beams and an energy-consuming central buckle between cable beams is innovatively applied, the seismic performance of a bridge tower is improved, the rigidity of each component of the bridge is coordinated and matched, seismic energy is actively consumed, the purpose of improving the comprehensive seismic performance of a full bridge is achieved, and the field that a large-span suspension bridge in the high-intensity seismic area adopts a reinforced concrete bridge tower is expanded.
The energy-consuming central buckle has the advantages that the combined use of the viscous damper between the tower beams and the cable beam can reduce the stress peak value of the central buckle and the stiffening beam, and can also fully utilize the characteristic that the main beam is rich in stress under the action of earthquake without the central buckle, so that the coupling action of the cable beam tower is enhanced, and the earthquake resistance of the cable tower is improved. Through the reasonable matching between the earthquake demand and the structural capacity of the main beam and the cable tower, the purposes of making the best use of things, economy and reasonability can be achieved.
The combined beam has the advantages that the transverse anti-seismic problem of the bridge tower is solved, the combined design idea is introduced into the design of the bridge tower beam, the structural characteristics and the stress characteristics of the corrugated steel web and the prestressed concrete top and bottom plates are fully utilized, the tower column-beam connecting structure is greatly simplified, and the defects of the concrete beam and the steel beam in the anti-seismic aspect are overcome. The bridge tower is transversely used as a frame structure, the idea of anti-seismic design is 'strong column weak beam, strong shear weak bending and strong node weak member', the strong column weak beam and the strong shear weak bending cannot be realized for a concrete beam, the strong node weak member cannot be realized for a steel beam (the stress of a steel concrete joint part is difficult to pass), the bending rigidity of the corrugated steel web plate combined box-shaped beam is lower, and the anti-shear capacity is stronger, so that the anti-seismic concept is really realized, and the bridge tower is an ideal transverse connection mode of a large-span suspension bridge tower in a high-intensity earthquake area.
Drawings
FIG. 1 is a full bridge constraint architecture layout diagram;
FIG. 2 is a schematic view of the corresponding position of the longitudinal viscous damper;
FIG. 3 is a plan view of the main bridge;
FIG. 4 is a layout view of an articulated energy dissipating center buckle;
fig. 5-6 are articulated energy dissipating central clasp members;
FIG. 7 is a schematic cross-sectional view A-A of FIG. 5;
FIG. 8 is a schematic cross-sectional view B-B of FIG. 5;
9-11 are schematic views of the cable tower shock-absorbing composite beam;
FIG. 12 damper installation view;
FIG. 13 is a schematic view A-A of FIG. 12;
fig. 14 is a schematic view of B-B in fig. 12.
Wherein: the device comprises a longitudinal viscous damper 1, a central buckle 2, a transverse wind-resistant support 3, a vertical tension-compression support 4, an energy-consuming rod piece 5, a main cable 6, a cable clamp 7, a double-fork lug 8, a thin nut 9, an adjusting nut 10, a lifting lug 11, a material core 12, ZH mortar 13, a constraint sleeve 14, a corrugated steel web 15 and a prestressed concrete top-bottom plate 16.
Detailed Description
The present invention will be described in detail with reference to fig. 1 to 14, and the technical solutions in the embodiments of the present invention will be clearly and completely described, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The invention provides a novel reasonable earthquake-resistant system structure of a suspension bridge in a high-intensity earthquake area through improvement; the protection system formed by the corrugated steel web combined cross beam, the viscous damper 1 between the tower beams and the energy-consuming central buckle 2 between the cable beams is adopted, the anti-seismic performance of the bridge tower is improved, the rigidity of each component of the bridge is coordinated and matched, the seismic energy is actively consumed, the purpose of improving the comprehensive anti-seismic performance of the full bridge is achieved, and therefore the field that the reinforced concrete bridge tower is adopted in the large-span suspension bridge in the seismic area of the high-intensity area is expanded.
In addition, 3 pairs of central buckles 2 are arranged in the main span of the suspension bridge to disperse the concentrated force of the central buckles on the main beam as much as possible; and a longitudinal viscous damper 1 is arranged between the tower beams.
The energy dissipation member bar 5 is used as a main body component of the central buckle 2, is a displacement-related energy dissipater, such as various buckling-restrained brace members, has stable and full hysteretic energy dissipation performance, is required to achieve full-section yielding when being tensioned and compressed, and has equivalent supporting and compressed bearing capacity to tensioned bearing capacity, so that the hysteretic energy dissipation function of steel is fully exerted. The upper end of the energy consumption rod piece 5 is hinged with a cable clamp 7 corresponding to the main cable 6, and the lower end is hinged with a steel truss girder ear plate.
The energy consumption rod piece 5 comprises a double-fork ear 8, a thin nut 9, an adjusting nut 10, a lifting lug 11, a material core 12, ZH mortar 13 and a constraint sleeve 14; the restraining sleeve 14 wraps the outer side of the ZH mortar 13 to form a restraining unit of the energy dissipation rod piece, so that the core 12 is always approximately in an axial tension and compression state. Arranging a material core 12 in ZH mortar 13, wherein the material core 12 is generally made of low-yield-point steel to form a main body structure of the energy-consuming bar, arranging double-fork lugs 8 at two ends of the main body structure through thin nuts 9 and adjusting nuts 10, and arranging lifting lugs 11 at the outer side of the main body structure; and a non-adhesive coating is arranged between the constraint unit and the core to form a sliding mechanism unit.
The beam adopts a combined structure of a corrugated steel web 15 and a prestressed concrete top and bottom plate 16, and the corrugated steel web replaces a concrete web of a common concrete box beam in the structure, so that the dead weight of the beam is reduced, and meanwhile, due to the wrinkle effect of the corrugated steel web, the axial and bending rigidity of the beam is greatly reduced, so that the self-vibration period of the structure can be prolonged, and the earthquake force is reduced.
The invention discloses a reasonable suspension bridge multipoint dispersed seismic isolation system and constraint system in a high-intensity seismic area, a protection system formed by a corrugated steel web combined beam, a viscous damper between tower beams and an energy-consuming central buckle between cable beams is innovatively applied, the seismic performance of a bridge tower is improved, the rigidity of each component of the bridge is coordinated and matched, seismic energy is actively consumed, the purpose of improving the comprehensive seismic performance of a full bridge is achieved, and the field that a large-span suspension bridge in the high-intensity seismic area adopts a reinforced concrete bridge tower is expanded.
The technical scheme adopted by the invention for solving the technical problem is as follows:
(1) as shown in fig. 1, 3 pairs of central buckles are arranged in the main span so as to disperse the concentrated force of the central buckles on the main beam as much as possible; and meanwhile, a longitudinal viscous damper is arranged between the tower beams. Based on the ductility anti-seismic design concept, the energy consumption rod is used as a main component of the central buckle, the energy consumption rod is a displacement-related energy dissipater, such as various buckling-restrained brace rods, and has stable and full hysteretic energy consumption performance, the full-section yielding can be achieved when the buckling-restrained brace rods are tensioned and compressed, the bearing capacity of the tensioned brace is equivalent to that of the tensioned brace rod, and therefore the hysteretic energy consumption effect of steel is fully exerted. The damper and the energy-consumption type central buckle are combined, so that the longitudinal anti-seismic problem of the bridge is solved, the central buckle is in an elastic state under the action of static load and an E1 earthquake, and sufficient rigidity is provided for a main body structure, so that the structure is ensured to meet the normal action requirement; under the action of an E2 earthquake, most energy in the earthquake is dissipated by the central buckle energy consumption rod piece and the viscous damper, the dynamic reaction of the structure is quickly attenuated, and the main structure is protected from plasticity. Compared with the single use of the central buckle, the combined use of the central buckle and the stiffening beam can reduce the stress peak value of the central buckle and the stiffening beam, and can also fully utilize the characteristic of rich stress of the main beam under the action of earthquake without the central buckle, so that the coupling action of the cable beam tower is strengthened, and the earthquake resistance of the cable tower is improved. Through the reasonable matching between the earthquake demand and the structural capacity of the main beam and the cable tower, the purposes of making the best use of things, economy and reasonability can be achieved. By adopting the technology, the longitudinal seismic force of the bridge tower can be reduced by more than 25%.
(2) As shown in fig. 9 to 11, the cross beam adopts a combination structure of the corrugated steel web and the prestressed concrete top and bottom plates, in which the corrugated steel web is used to replace the concrete web of the conventional concrete box beam, so that the self weight of the cross beam is reduced, and the axial and bending stiffness of the cross beam is greatly reduced due to the corrugation effect of the corrugated steel web. The bridge tower has the advantages of good anti-seismic performance, simple and convenient construction, good economy and the like derived from the characteristics.
The combined beam has the advantages that the problem of transverse seismic resistance of a bridge is solved, the combined design idea is introduced into the design of the bridge tower beam, the structural characteristics and the stress characteristics of the corrugated steel web and the prestressed concrete top and bottom plates are fully utilized, the tower column-beam connecting structure is greatly simplified, and the defects of the concrete beam and the steel beam in the seismic resistance aspect are overcome. The bridge tower is transversely used as a frame structure, the idea of anti-seismic design is 'strong column weak beam, strong shear weak bending and strong node weak member', the strong column weak beam and the strong shear weak bending cannot be realized for a concrete beam, the strong node weak member cannot be realized for a steel beam (the stress of a steel concrete joint part is difficult to pass), the bending rigidity of the corrugated steel web plate combined box-shaped beam is lower, and the anti-shear capacity is stronger, so that the anti-seismic concept is really realized, and the bridge tower is an ideal transverse connection mode of a large-span suspension bridge tower in a high-intensity earthquake area. By adopting the technology, the transverse seismic force of the bridge tower can be reduced by more than 20%.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (7)
1. A novel reasonable earthquake-resistant system structure of a suspension bridge in a high-intensity earthquake area is characterized in that: the protection system formed by the corrugated steel web combined cross beam, the viscous damper (1) between the tower beams and the energy-consuming central buckle (2) between the cable beams is adopted, the anti-seismic performance of the bridge tower is improved, the rigidity of each component of the bridge is coordinated and matched, the seismic energy is actively consumed, the purpose of improving the comprehensive anti-seismic performance of the full bridge is achieved, and therefore the field that the reinforced concrete bridge tower is adopted in the ultra-large span suspension bridge in the seismic region of the high-intensity area is expanded.
2. The reasonable earthquake-resistant novel architecture of the suspension bridge in the high-intensity earthquake region as claimed in claim 1, wherein: 3 pairs of central buckles (2) are arranged in the main span of the suspension bridge to disperse the concentrated force of the central buckles on the main beam as much as possible; meanwhile, a longitudinal viscous damper (1) is arranged between the tower beams.
3. The reasonable earthquake-resistant novel architecture of the suspension bridge in the high-intensity earthquake region as claimed in claim 1, wherein: the longitudinal viscous damper (1) is respectively connected with the bridge tower and the main beam.
4. The reasonable earthquake-resistant novel architecture of the suspension bridge in the high-intensity earthquake region as claimed in claim 1, wherein: the energy dissipation member bar (5) is used as a main component of the central buckle (2), the energy dissipation member bar is a displacement-related energy dissipater, such as buckling-restrained brace bar bars in various forms, and has stable and full hysteretic energy dissipation performance, the buckling-restrained brace bar is required to be capable of achieving full-section yielding when being tensioned and compressed, and the bearing capacity of the tensioned brace bar is equivalent to that of the tensioned brace bar, so that the hysteretic energy dissipation function of steel is fully exerted.
5. The reasonable earthquake-resistant novel architecture of the suspension bridge in the high-intensity earthquake region as claimed in claim 1, wherein: the upper end of the energy consumption rod piece (5) is hinged with a cable clamp (7) corresponding to the main cable (6), and the lower end of the energy consumption rod piece is hinged with a steel truss girder ear plate.
6. The reasonable earthquake-resistant novel architecture of the suspension bridge in the high-intensity earthquake region as claimed in claim 1, wherein: the energy consumption rod piece (5) comprises double fork lugs (8), a thin nut (9), an adjusting nut (10), a lifting lug (11), a material core (12), ZH mortar (13) and a constraint sleeve (14); the restraint sleeve (14) wraps the outer side of the ZH mortar (13) to form a restraint unit of the energy consumption rod piece, so that the material core (12) is always approximately in an axial tension and compression state; arranging a material core (12) in ZH mortar (13), wherein the material core (12) is generally made of low-yield-point steel to form a main body structure of an energy-consuming rod piece, two ends of the main body structure are provided with double fork lugs (8) through thin nuts (9) and adjusting nuts (10), and the outer side of the main body structure is provided with a lifting lug (11); and a non-adhesive coating is arranged between the constraint unit and the core to form a sliding mechanism unit.
7. The reasonable earthquake-resistant novel architecture of the suspension bridge in the high-intensity earthquake region as claimed in claim 1, wherein: the beam adopts a combined structure of the corrugated steel web (15) and the prestressed concrete top and bottom plates (16), and the corrugated steel web replaces the concrete web of a common concrete box beam in the structure, so that the dead weight of the beam is reduced, and meanwhile, due to the wrinkle effect of the corrugated steel web, the axial and bending rigidity of the beam is greatly reduced, so that the self-vibration period of the structure can be prolonged, and the earthquake force is reduced.
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| CN202010034371.7A CN111074776A (en) | 2020-01-14 | 2020-01-14 | Novel reasonable anti-seismic system structure of suspension bridge in high-intensity earthquake area |
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| CN202010034371.7A CN111074776A (en) | 2020-01-14 | 2020-01-14 | Novel reasonable anti-seismic system structure of suspension bridge in high-intensity earthquake area |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111691286A (en) * | 2020-06-05 | 2020-09-22 | 中交第二公路勘察设计研究院有限公司 | Suspension bridge hinged energy-consuming damping buckle structure |
| CN112695616A (en) * | 2021-02-04 | 2021-04-23 | 重庆交通大学 | Anti-seismic coupling structure for assembled steel-concrete composite beam |
-
2020
- 2020-01-14 CN CN202010034371.7A patent/CN111074776A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111691286A (en) * | 2020-06-05 | 2020-09-22 | 中交第二公路勘察设计研究院有限公司 | Suspension bridge hinged energy-consuming damping buckle structure |
| CN112695616A (en) * | 2021-02-04 | 2021-04-23 | 重庆交通大学 | Anti-seismic coupling structure for assembled steel-concrete composite beam |
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