Device and calculation method for improving anti-collision toughness of mountain bridges

Abstract

The embodiment of the present invention discloses a device for improving the anti-collision toughness of bridges in mountainous areas and a calculation method. The energy consumption resistance of the composite protective shell is obtained by multiplying the rubber layer thickness, compression deformation and collision area of ​​the assembly by the rubber compressive elastic modulus; the resistance is obtained by summing the elastic resistance of the pier, the plastic resistance of the pier and the energy consumption resistance of the composite protective shell; the recovery force is obtained by summing the cost required for pier recovery and the time required for pier recovery; the performance index of the pier and the performance index after limited damage to the pier are obtained by four arithmetic operations, and the redundancy is obtained by probability operation, and the anti-collision toughness of the bridge is obtained by summing the resistance and the recovery force. The problem that the separate device is difficult to construct in mountainous areas, has weak anti-collision ability and high comprehensive cost is solved. The comprehensive anti-collision toughness and road traffic capacity of mountainous bridges are improved by energy consumption of the assembly and recoverable deformation of the pier.

Description

Technical Field

[0001] The present disclosure relates to the technical field of bridge engineering, and in particular to a device and a calculation method for improving the anti-collision toughness of bridges in mountainous areas. Background Art

[0002] Due to the complex natural environment and geological conditions, mountain roads are often hit by disasters such as earthquakes, rockfalls, impacts, and scours. Among them, bridge projects have become controlling nodes in road sections and even road networks due to their weak disaster resistance, difficulty in emergency repair, and long repair time. The biggest impact on mountain bridges is the impact of collapsed rocks on the lower structure. Since the lower structure of highway bridges is generally a relatively slender and flexible component, the huge energy of the rockfall impact is prone to cause the bridge piers to tilt, break, and collapse, resulting in the fall of the upper structure beams.

[0003] Existing measures to prevent collapsed rocks from impacting bridge piers include a separate device, in which a protective net is arranged on the rockfall path, and a concrete crash island with large size and rigidity is set in the direction where the pier is impacted. The crash island and the pier are spaced a certain distance apart. The crash island is deformed and damaged after being impacted without affecting the pier, but it is difficult to construct bridges in mountainous areas, and increasing the water resistance is not conducive to flood discharge; an attached device, in which this type of structure is directly connected to the pier through a connecting device, forming a protective layer around the pier, and jointly bearing the impact of rockfall with the pier, but has a weak anti-impact ability, a complex structure, poor versatility, needs to be replaced later, and has a high overall cost. Summary of the invention

[0004] The disclosed invention provides a device for improving the anti-collision toughness of bridges in mountainous areas and a calculation method, which solves the problems that separate devices are difficult to construct in mountainous areas, affecting flood discharge, and that attached devices have weak anti-impact capabilities, are cumbersome to manufacture and install, need to be replaced later, and have high overall costs. By consuming energy of the assembly and restoring deformation of the piers, the comprehensive anti-collision toughness and road traffic capacity of bridges in mountainous areas are improved.

[0005] The invention provides a device for improving the anti-collision toughness of a mountain bridge, comprising: a combination body, a protective coating, an adhesive tape and a sealant.

[0006] The assembly comprises a first assembly, a second assembly and a third assembly, wherein the first assembly, the second assembly and the third assembly are connected to each other along the circumferential direction and the vertical direction on the outer surface of the pier to form an assembly; the protective coating is arranged on the outer surface of the assembly, the inner side of the adhesive tape is arranged on the surface of the pier, the sealant is arranged at the junction of the top of the assembly and the pier cap beam, the sealant is arranged at the junction of the bottom of the assembly and the pier cap, and the sealant is arranged on the outer surfaces of the circumferential and vertical joints of the first assembly, the second assembly and the third assembly.

[0007] In one embodiment, a grooved steel plate is disposed inside the first assembly, ribs are evenly disposed on the grooved steel plate, and fiber mesh and rubber layers are alternately arranged inside the grooved steel plate. The second assembly, the third assembly and the first assembly have the same structure.

[0008] In one embodiment, adhesive is disposed between the first assembly, the second assembly, and the third assembly in both the circumferential and vertical directions.

[0009] The present invention further provides a method for calculating the anti-collision toughness of a bridge in a mountainous area based on a device for improving the anti-collision toughness of a bridge in a mountainous area, comprising: obtaining the energy-dissipating resistance of a composite protective shell by multiplying the thickness of a rubber layer, a compression deformation amount and a collision area of ​​the assembly by the rubber compressive elastic modulus; obtaining the resistance by summing the elastic resistance of a pier, the plastic resistance of a pier and the energy-dissipating resistance of the composite protective shell; obtaining the restoring force by summing the cost required for pier recovery and the time required for pier recovery; obtaining the performance index of the pier and the performance index after limited damage to the pier by performing four arithmetic operations on the performance index parameters of the pier, and obtaining the redundancy by probability operation, and summing the redundancy with the resistance and the restoring force to obtain the anti-collision toughness of the bridge.

[0010] In one embodiment, the energy dissipation resistance of the composite protective shell is obtained by multiplying the rubber layer thickness, the compression deformation and the collision area of ​​the assembly by the rubber compressive elastic modulus, including:

[0011] The composite protective shell has a high energy consumption resistance for

[0012]

[0013] in, is the compressive elastic modulus of rubber, is the collision contact area, is the thickness of the rubber layer, is the compression deformation of the rubber layer.

[0014] In one embodiment, the resistance obtained by summing the elastic resistance of the pier, the plastic resistance of the pier and the energy dissipation resistance of the composite protective shell includes:

[0015] The elastic resistance of the pier

[0016]

[0017] The plastic resistance of the bridge pier

[0018]

[0019] The resistance is obtained by summing the elastic resistance of the pier, the plastic resistance of the pier and the energy dissipation resistance of the composite protective shell, wherein the resistance for

[0020]

[0021] in, is the concrete bearing capacity calculation coefficient, is the design value of concrete strength, is the concrete area, is the radius of the bridge pier, Steel bar bearing capacity calculation coefficient, is the design value of steel bar strength, is the steel bar area, The radius of the circle enclosed by the steel bars, is the strength coefficient of confined concrete, is the standard value of concrete strength, is the area of ​​the compression zone corresponding to the ultimate compressive strain of concrete, is the yield strength of steel bars.

[0022] In one embodiment, the restoring force is obtained by summing the cost required for bridge pier restoration and the time required for bridge pier restoration, including:

[0023] The restoring force for

[0024]

[0025] in, To recover the costs, The time required for recovery, is the weight coefficient of the cost required for recovery, and n is the weight coefficient of the time required for recovery.

[0026] In one embodiment, the performance index parameters of the piers are obtained by four arithmetic operations to obtain the pier performance index and the performance index after the pier has limited damage, and then the redundancy is obtained by probability operation and summed with the resistance and the restoring force to obtain the anti-collision toughness of the bridge, including:

[0027] The performance index of the bridge pier for

[0028]

[0029] The performance index of the bridge pier and the performance index of the bridge pier after limited damage are obtained by probability calculation.

[0030]

[0031] The redundancy , the resistance and the resilience The sum is calculated to obtain the bridge anti-collision toughness

[0032]

[0033] in, are the performance index parameters of the piers, To calculate the total number of indicators, is the total number of categories of each indicator, is the performance index of the bridge pier, is the performance index of the bridge pier after limited damage. is the weight coefficient of resistance, is the weight coefficient of the restoring force, is the redundancy weight coefficient.

[0034] Beneficial effects of the present invention: An embodiment of the present invention provides a device for improving the anti-collision toughness of mountain bridges, the assembly comprising a first assembly, a second assembly and a third assembly, the first assembly, the second assembly and the third assembly are connected to each other along the circumferential direction and the vertical direction on the outer surface of the pier, the first assembly, the second assembly and the third assembly are made of inner circumferential blocks and vertical segments, all of which are block-shaped, which disperse the impact force of objects hitting the assembly, and extend the service life of the device for improving the anti-collision toughness of mountain bridges; the protective coating is arranged on the outer surface of the assembly; the inner side of the adhesive tape is pasted and arranged on the surface of the pier, and the outer side of the adhesive tape is pasted and arranged on the inner surface of the assembly, the assembly matches the diameter of the pier, the sealant is arranged at the junction of the top of the assembly and the pier cap beam, and the sealant is arranged at the junction of the bottom of the assembly and the pier base, to prevent the water flow in the river channel and external water vapor from penetrating and affecting the performance of the annular adhesive tape.

[0035] A method for calculating the anti-collision toughness of a bridge in a mountainous area is provided in an embodiment of the present invention. The energy dissipation resistance of a composite protective shell is obtained by multiplying the rubber layer thickness, the compression deformation and the collision area of ​​the assembly by the rubber compressive elastic modulus; the resistance is obtained by summing the elastic resistance of the pier, the plastic resistance of the pier and the energy dissipation resistance of the composite protective shell; the restoring force is obtained by summing the cost required for the pier recovery and the time required for the pier recovery; the performance index of the pier and the performance index after the pier has limited damage are obtained by performing four arithmetic operations on the performance index parameters of the pier, and the redundancy is obtained according to probability calculation, and the redundancy is summed with the resistance and the restoring force to obtain the anti-collision toughness of the bridge.

[0036] The embodiments of the present invention can solve the problems that the detachable device is difficult to construct in mountainous areas, which affects flood discharge, and the attached device has weak anti-impact ability, cumbersome manufacturing and installation, needs to be replaced later, and has a high overall cost. The comprehensive anti-impact toughness and road traffic capacity of mountain bridges are improved through the energy dissipation of the assembly and the recovery of deformation of the piers. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 It is a schematic diagram of the overall structure of the device for improving the anti-collision toughness of mountain bridges provided by the present invention;

[0038] Figure 2 It is a transverse cross-sectional view of the device for improving the anti-collision toughness of mountain bridges provided by the present invention;

[0039] Figure 3 A schematic structural diagram of the adhesive tape provided by the present invention;

[0040] Figure 4 A schematic diagram of the block structure of the assembly provided by the present invention;

[0041] Figure 5 A schematic diagram of a three-dimensional structure of a combination provided by the present invention;

[0042] Figure 6 A schematic structural diagram of a first assembly provided by the present invention;

[0043] Figure 7 for Figure 1 A schematic diagram of the structure enlarged at A in FIG.

[0044] Figure 8 for Figure 5 A schematic diagram of the structure enlarged at B in FIG.

[0045] Fig. 9 for Figure 5 Schematic diagram of the structure enlarged at C in the figure;

[0046] Fig.10 It is a flow chart of the method for calculating the anti-collision toughness of mountain bridges provided by the present invention.

[0047] Icons: 100-assembly; 110-first assembly; 111-trough steel plate; 112-rib; 113-fiber mesh; 114-rubber layer; 120-second assembly; 130-third assembly; 140-adhesive; 200-protective coating; 300-adhesive tape; 400-sealant; 500-pier; 510-pier cap beam. DETAILED DESCRIPTION

[0048] Combine the following Figure 1-Figure 10 The invention describes a device and a calculation method for improving the anti-collision toughness of a mountain bridge.

[0049] Reference Figure 1-Figure 9 Specifically, the present invention provides a device for improving the anti-collision toughness of bridges in mountainous areas, including an assembly 100, a protective coating 200, an adhesive tape 300 and a sealant 400. The assembly 100 includes a first assembly 110, a second assembly 120 and a third assembly 130, which are connected to each other along the circumferential direction and the vertical direction on the outer surface of the pier 500. The first assembly 110, the second assembly 120 and the third assembly 130 are assembled and combined, and the first assembly 110, the second assembly 120 and the third assembly 130 are made of inner circumferential blocks and vertical segments, and are all block-shaped, which disperses the impact force of objects hitting the assembly 100 and prolongs the service life of the device for improving the anti-collision toughness of bridges in mountainous areas; the protective coating 200 is provided It is placed on the outer surface of the assembly 100 to extend the service life of the assembly 100; the inner side of the adhesive tape 300 is pasted and set on the surface of the pier 500, and the outer side of the adhesive tape 300 is pasted and set on the inner surface of the assembly 100. The diameters of the assembly 100 and the pier 500 are matched. The sealant 400 is set at the junction of the top of the assembly 100 and the pier cap beam 510, and the sealant 400 is set at the junction of the bottom of the assembly 100 and the base of the pier 500 to prevent the water flow in the river channel and the external water vapor from penetrating and affecting the performance of the annular adhesive tape.

[0050] In this embodiment, the adhesive tape 300 is attached to the surface of the pier 500 in a ring shape from top to bottom at a vertical interval of 30-50 cm. The protective coating 200 is an anti-aging and anti-wear coating, which can slow down the aging and wear of the assembly 100 and extend the service life of the assembly 100.

[0051] Reference Figure 6 The first assembly 110 is provided with a grooved steel plate 111 inside, and fiber mesh 113 and rubber layer 114 are arranged alternately inside the grooved steel plate 111. The grooved steel plate 111 can improve the strength and rigidity of the rubber layer 114. The steel fiber mesh 113 can restrain the lateral expansion of the rubber while maintaining the vertical deformation capacity of the rubber layer 114, thereby reducing the deformation of the rubber, increasing the compression and tearing resistance of the rubber, extending the service life, and improving the compression resistance and recovery capacity of the assembly 100. Steel plate ribs 112 are evenly arranged on the grooved steel plate 111 to reinforce the grooved steel plate 111 and improve the rigidity of the grooved steel plate 111. The second assembly 120, the third assembly 130 and the first assembly 110 have the same structure.

[0052] Reference Figure 8-9 and Figure 5Adhesive 140 is arranged between the circumferential and vertical joints of the first assembly 110, the second assembly 120 and the third assembly 130, so that the first assembly 110, the second assembly 120 and the third assembly 130 are tightly adhered to each other, and sealant 400 is arranged on the outer surfaces of the circumferential and vertical joints of the first assembly 110, the second assembly 120 and the third assembly 130 to prevent water flow in the river and external water vapor from penetrating.

[0053] Specifically, the present invention provides a method for calculating the anti-collision toughness of mountain bridges, referring to Fig.10 , Fig.10 It is a flow chart of the method for calculating the anti-collision toughness of mountain bridges provided by the present invention.

[0054] The method for calculating the anti-collision toughness of a mountain bridge provided by an embodiment of the present invention includes the following steps:

[0055] Step 100, the energy dissipation resistance of the composite protective shell is obtained by multiplying the rubber layer thickness, the compression deformation and the collision area of ​​the assembly by the rubber compressive elastic modulus.

[0056] Here, step 100 includes:

[0057] Composite protective shell energy resistance for

[0058]

[0059] in, is the compressive elastic modulus of rubber, is the collision contact area, is the thickness of the rubber layer, is the compression deformation of the rubber layer.

[0060] Step 200, obtaining resistance by summing the elastic resistance of the pier, the plastic resistance of the pier and the energy dissipation resistance of the composite protective shell.

[0061] Here, step 200 includes:

[0062] When a bridge pier encounters an impact, the contact area between the pier and the falling rocks is very small. Both are rigid bodies, and the instantaneous impact force acting on the pier is very large, which can easily cause the pier to tilt, break, or collapse. Therefore, an elastomer is installed on the pier as a device to improve the anti-collision toughness of mountain bridges. When the falling rocks impact the elastomer, it dissipates the impact energy through its own deformation.

[0063] Elastic resistance of bridge pier

[0064]

[0065] Plastic resistance of bridge piers

[0066]

[0067] The resistance is obtained by summing the elastic resistance of the pier, the plastic resistance of the pier and the energy dissipation resistance of the composite protective shell. for

[0068]

[0069] in, is the concrete bearing capacity calculation coefficient, is the design value of concrete strength, is the concrete area, is the radius of the bridge pier, Steel bar bearing capacity calculation coefficient, is the design value of steel bar strength, is the steel bar area, The radius of the circle enclosed by the steel bars, is the strength coefficient of confined concrete, is the standard value of concrete strength, is the area of ​​the compression zone corresponding to the ultimate compressive strain of concrete, is the yield strength of steel bars.

[0070] Step 300, the restoration force is obtained by summing the cost required for the bridge pier restoration and the time required for the bridge pier restoration.

[0071] Here, step 300 includes:

[0072] Resilience for

[0073]

[0074] in, To recover the costs, The time required for recovery, is the weight coefficient of the cost required for recovery, and n is the weight coefficient of the time required for recovery.

[0075] Step 400, the performance index parameters of the piers are obtained by four arithmetic operations to obtain the performance index of the piers and the performance index after the piers have limited damage, and then the redundancy is obtained by probability operation and summed with the resistance and the restoring force to obtain the anti-collision toughness of the bridge.

[0076] The energy dissipation resistance of the composite protective shell is obtained by multiplying the rubber layer thickness, compression deformation and collision area of ​​the assembly by the rubber compressive elastic modulus; the resistance is obtained by summing the elastic resistance of the pier, the plastic resistance of the pier and the energy dissipation resistance of the composite protective shell; the recovery force is obtained by summing the cost required for pier recovery and the time required for pier recovery; the performance index of the pier and the performance index after the pier has limited damage are obtained by four arithmetic operations, and the redundancy is obtained by probability calculation, and the bridge anti-collision toughness is obtained by summing the resistance and the recovery force. The problem that the separated device is difficult to construct in mountainous areas, affecting flood discharge, and the attached device has weak anti-collision ability, cumbersome manufacturing and installation, needs to be replaced later, and has a high comprehensive cost is solved. The tear resistance of the anti-collision toughness improvement device of mountain bridges is improved, the service life is extended, the deformation degree of the pier is reduced, and the pier can be self-recovered, so that the pier can be used normally without affecting the passage of vehicles.

[0077] Here, step 400 includes:

[0078] Pier performance index for

[0079]

[0080] After the mountain bridge anti-collision toughness improvement device consumes energy, the remaining impact force is transmitted to the bridge piers. The bridge piers are considered to have limited damage, and there is no need to increase the size of the piers and the reinforcement. This ensures that the bridge piers only have local slight cracks and deformations that can recover by themselves, and can still be used normally without affecting the passage of vehicles.

[0081] The performance index of the bridge pier and the performance index after the pier has limited damage are obtained through probability calculation to obtain the redundancy

[0082]

[0083] Redundancy ,resistance and resilience The sum is calculated to obtain the bridge anti-collision toughness

[0084]

[0085] in, are the performance index parameters of the piers, To calculate the total number of indicators, is the total number of categories of each indicator, is the performance index of the bridge pier, is the performance index of the bridge pier after limited damage. is the weight coefficient of resistance, is the weight coefficient of the restoring force, is the redundancy weight coefficient.

[0086] The above are only preferred implementations of the present application and are not intended to limit the present application. For those skilled in the art, the present application may have various modifications and variations. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. A method for calculating the anti-collision toughness of a mountain bridge, which is used for a device for improving the anti-collision toughness of a mountain bridge, the device being used to wrap the outer surface of a pier (500), the pier (500) comprising a pier cap beam (510), the device comprising: An assembly (100), the assembly (100) comprising a first assembly (110), a second assembly (120) and a third assembly (130), the first assembly (110), the second assembly (120) and the third assembly (130) being connected to each other along the circumferential direction and the vertical direction on the outer surface of the pier (500) to form an assembly; a protective coating (200), the protective coating (200) being arranged on the outer surface of the assembly (100); an adhesive tape (300), the inner side of the adhesive tape (300) being arranged on the surface of the pier (500), and the outer side of the adhesive tape (300) being arranged on the inner surface of the assembly (100); A sealant (400), wherein the sealant (400) is arranged at the junction of the top of the assembly (100) and the bridge pier cap beam (510), the sealant (400) is arranged at the junction of the bottom of the assembly (100) and the pedestal of the bridge pier (500), and the sealant (400) is arranged on the outer surfaces of the circumferential and vertical joints between the first assembly (110), the second assembly (120), and the third assembly (130); a grooved steel plate (111) is arranged inside the first assembly (110), ribs (112) are evenly arranged on the grooved steel plate (111), and fiber meshes (113) and rubber layers (114) are alternately arranged inside the grooved steel plate (111); the second assembly (120), the third assembly (130), and the first assembly (110) have the same structure; and the calculation method comprises: The energy dissipation resistance of the composite protective shell is obtained by multiplying the rubber layer thickness, the compression deformation and the collision area of ​​the assembly by the rubber compressive elastic modulus; The resistance is obtained by summing the elastic resistance of the pier, the plastic resistance of the pier and the energy dissipation resistance of the composite protective shell; The restoring force is obtained by summing the cost required for the pier restoration and the time required for the pier restoration; The performance index parameters of the piers are obtained by four arithmetic operations to obtain the pier performance index and the performance index after the pier has limited damage, and then the redundancy is obtained according to probability calculation and summed with the resistance and the recovery force to obtain the bridge anti-collision toughness.

2. The method according to claim 1, characterized in that Adhesive (140) is provided between the first assembly (110), the second assembly (120), and the third assembly (130) in the circumferential direction and the vertical direction.

3. The method according to claim 2, characterized in that The energy dissipation resistance of the composite protective shell is obtained by multiplying the thickness of the rubber layer, the compression deformation and the collision area of ​​the assembly by the rubber compressive elastic modulus, including: The composite protective shell has a high energy consumption resistance for in, is the compressive elastic modulus of rubber, is the collision contact area, is the thickness of the rubber layer, is the compression deformation of the rubber layer.

4. The method according to claim 3, characterized in that The resistance obtained by summing the elastic resistance of the pier, the plastic resistance of the pier and the energy dissipation resistance of the composite protective shell includes: The elastic resistance of the pier for The plastic resistance of the bridge pier for The resistance is obtained by summing the elastic resistance of the pier, the plastic resistance of the pier and the energy dissipation resistance of the composite protective shell, wherein the resistance for in, is the concrete bearing capacity calculation coefficient, is the design value of concrete strength, is the concrete area, is the radius of the bridge pier, Steel bar bearing capacity calculation coefficient, is the design value of steel bar strength, is the steel bar area, The radius of the circle enclosed by the steel bars, is the strength coefficient of confined concrete, is the standard value of concrete strength, is the area of ​​the compression zone corresponding to the ultimate compressive strain of concrete, is the yield strength of steel bars.

5. The method according to claim 4, characterized in that The restoration force is obtained by summing the cost required for bridge pier restoration and the time required for bridge pier restoration, including: The restoring force for in, To recover the costs, The time required for recovery, is the weight coefficient of the cost required for recovery, and n is the weight coefficient of the time required for recovery.

6. The method according to claim 5, characterized in that The performance index parameters of the bridge piers are obtained by four arithmetic operations to obtain the performance index of the bridge piers and the performance index of the bridge piers after limited damage, and then the redundancy is obtained by probability operation and summed with the resistance and the recovery force to obtain the anti-collision toughness of the bridge, including: The performance index of the bridge pier for The performance index of the bridge pier and the performance index of the bridge pier after limited damage are obtained by probability calculation. for The redundancy , the resistance and the resilience The sum is calculated to obtain the bridge anti-collision toughness for in, are the performance index parameters of the piers, To calculate the total number of indicators, is the total number of categories of each indicator, is the performance index of the bridge pier, is the performance index of the bridge pier after limited damage. is the weight coefficient of resistance, is the weight coefficient of the restoring force, is the redundancy weight coefficient.

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