CN216838937U - Energy-consuming supporting device for preventing web plate from buckling for steel plate combined beam bridge - Google Patents

Abstract

The utility model provides an energy consumption strutting arrangement of web buckling prevention of steel sheet combination beam bridge, on two I-beams of decking lower extreme, be the symmetry respectively and divide and locate two beam ends, including a pair of buckling prevention component and power consumption bracing piece, web and the top and bottom edges of a wing of I-beam are hugged closely to a pair of buckling prevention component, the fixed stay is between the top and bottom edges of a wing, be used for concentrating the vibration of bridge floor from the I-beam and transmitting to the power consumption bracing piece, the power consumption bracing piece is as power consumption bearing structure, the bracing piece main part is with 45 slopes, support between I-beam bottom edge of a wing bottom and pier through hinged support respectively, the articulated department in upper end corresponds the setting according to a pair of buckling prevention component position, and link firmly with the bottom of a pair of buckling prevention component, the power consumption bracing piece is equipped with damping power consumption mechanism. The utility model discloses can be when improving other each item bearing capacity of web buckling restrained ability and roof beam, can also strengthen the power consumption effect under the vibration effect, reduce the vibration of bridge to the safety of traveling of guarantee vehicle.

Description

Energy dissipation supporting device for preventing buckling of web plate of steel plate combined beam bridge

Technical Field

The utility model relates to a highway and railway's bridge structures, the more specifically power consumption strutting arrangement who prevents web bucking of steel sheet combination beam bridge that says so.

Background

As a green bridge structure system, the assembly type steel plate composite beam bridge is popularized and implemented in partial areas, for example, dozens of small and medium bridges of a Unionidae expressway all adopt an assembly type steel plate composite beam bridge structure form. However, the steel plate combined beam bridge mainly with double main beams is adopted at present, the measured 1, 2-order natural vibration periods of a multi-bridge are 0.35 second and 0.10 second respectively, the 2-order vibration period is just the period range with the strongest effect in the seismic response spectrum, the seismic effect coupling effect is obvious, and the seismic effect is stronger. Meanwhile, the acceleration driving vibration coupling effect of the driving vibration effect actually measured from the bridge is obvious, the driving vibration effect is stronger, and the actually measured maximum bridge deck acceleration response reaches 0.15 g.

The violent vibration that steel sheet combination beam bridge produced under the action of driving load not only causes huge injury to bridge structures itself, also influences vehicle driving in-process passenger's comfort simultaneously.

SUMMERY OF THE UTILITY MODEL

The utility model discloses aim at solving above-mentioned technical problem to a certain extent at least. Therefore, the utility model provides an energy consumption strutting arrangement of web buckling prevention of steel sheet combination beam bridge to can also strengthen the energy consumption effect under the vibration effect when improving other each item bearing capacity of web buckling prevention ability and roof beam in the hope, reduce the vibration of bridge, thereby ensure the safety of traveling of vehicle.

In order to achieve the above purpose, the utility model adopts the following technical scheme:

the utility model provides an energy consumption strutting arrangement of web buckling prevention of steel sheet combination beam bridge, its structural feature is that, a pair of I-beam be horizontal symmetrical arrangement, set firmly the lower extreme at the decking, the roof beam body is along longitudinal extension to decking both ends, on every I-beam, is the symmetry and divides and establish a pair of energy consumption strutting arrangement who installs at the beam-ends portion, energy consumption strutting arrangement includes:

the pair of buckling-restrained components are symmetrically arranged on two sides of a web plate of the I-beam and are used for transmitting vibration of a bridge deck plate from the I-beam to energy-consuming support rods below the I-beam in a centralized manner, the buckling-restrained components on each side are tightly attached to the web plate and upper and lower flanges and fixedly supported between the upper and lower flanges, the buckling-restrained components on each side are integrally in an isosceles trapezoid structure without a lower bottom, a through frame is formed between each side of the trapezoid, cross-shaped stiffening rib plate structures are arranged in two waists, the outer edge of the bottom end of the waist on the outward side is flush with the beam end, and the waist on the inward side is used for connecting the energy-consuming support rods;

the energy-consuming support rod is used as an energy-consuming support structure, the support rod main body inclines downwards and outwards towards the pier at an inclination angle of 45 degrees, the upper end and the lower end of the support rod main body are respectively hinged and supported between the bottom end of the flange of the I-beam lower flange and the pier through an upper hinged support and a lower hinged support, and the top end of the upper hinged support is fixedly connected with the flange of the I-beam lower flange and the bottom ends of the inward side waists of the pair of anti-buckling components; the support rod main body is provided with a vibration damping and energy consuming mechanism which comprises a sealing sleeve, a piston rod, a first cylinder body, a second cylinder body, a first piston, a second piston, a first reset spring and a second reset spring, wherein the first cylinder body, the second cylinder body, the first piston, the second piston, the first reset spring and the second reset spring are positioned in the sealing sleeve, the piston rod is axially and movably sleeved in the sealing sleeve, the top of the piston rod faces upwards and is exposed, a first cavity and a second cavity which are independent are formed in the sealing sleeve by the first cylinder body at the top end part, the second cylinder body at the bottom end part and the cylinder bottom of the sealing sleeve in a separated mode and are respectively filled with hydraulic oil, the first cylinder body is fixedly sleeved on the piston rod in the first cavity and forms a synchronous axial displacement component with the piston rod, the first piston is movably sleeved on the piston rod and is tensioned with the first cylinder body and the second cylinder body respectively through a plurality of first reset springs which are arranged in parallel to the axial direction, and the second cylinder body is coaxially and fixedly connected to the inner wall of the sealing sleeve in the second cavity, the piston rod axially passes through the second cylinder body in a displaceable manner, the tail end of the piston rod is fixedly sleeved with the second piston, and the second piston, the second cylinder body and the bottom of the sealing sleeve barrel are respectively tensioned by a plurality of second return springs which are arranged in parallel to the axial direction.

The utility model discloses a structural feature also lies in:

in the anti-buckling component, an upper bottom plate of an isosceles trapezoid is tightly attached to the bottom end face of an upper flange of an I-beam, bottom end sealing plates of two waists are tightly attached to the bottom end face of a lower flange of the I-beam, a through frame is formed between the two waists and the upper bottom of the trapezoid, a vertical plate is parallel to a web plate and is opposite to the end face of one side of the web plate, the vertical plate is tightly attached to the web plate of the I-beam, and the end face of the other side of the vertical plate is open;

the cross stiffening rib plate structures in the waist at two sides are symmetrically arranged, an oblique stiffening rib plate is arranged between the middle part of the bottom end sealing plate of the waist and the upper bottom plate in each side waist in parallel to the waist, and a transverse stiffening rib plate is transversely pulled in the waist at the middle height position of the isosceles trapezoid and fixedly connected with the oblique stiffening rib plate to form the cross stiffening rib plate structure.

In the anti-buckling component, the lower base angle of the isosceles trapezoid is 45 degrees.

Among the power consumption bracing piece:

the top of the piston rod is exposed and is hinged to the upper hinged support through an upper connecting piece, and the bottom of the sealing sleeve is hinged to the lower hinged support through a lower connecting piece;

the elastic modulus of the first reset spring is greater than that of the second reset spring, and the plurality of first reset springs and the plurality of second reset springs are arranged in parallel to the axial direction and are respectively distributed around the central axis of the piston rod at equal intervals in the circumferential direction;

a plurality of oil passing holes are uniformly distributed on the first piston and the second piston respectively; in the initial state, the first piston is located at the middle position of the piston rod, and the second piston is located at the middle position of the second chamber.

Anti-slip rings are arranged between the second piston and the wall of the sealing sleeve barrel and between the first piston and the wall of the sealing sleeve barrel;

the second cylinder body is corresponding to the piston rod penetrating position, the first cylinder body is corresponding to the piston rod penetrating position, and the top end of the sealing sleeve is corresponding to the piston rod penetrating position and is respectively sealed through a sealing rubber ring.

And the top end of the upper hinged support, the bottom flange of the I-shaped beam and the middle position of the bottom end of the pair of buckling-restrained components facing the inner side waist are provided with vertically through upper holes, and the upper holes are fastened through high-strength bolts arranged in the upper holes in a penetrating manner through threads.

And a lower through hole which is transversely communicated with the pier is formed in the middle of the lower hinged support mounting end and corresponds to the pier, and the lower through hole is fastened by a lower high-strength bolt which is arranged in the lower through hole in a penetrating manner through threads.

And the pair of I-shaped steel beams are transversely and fixedly connected through the cross beam.

Compared with the prior art, the utility model discloses beneficial effect embodies:

1. the utility model discloses the bucking component is prevented to structure has good ductility, and the power consumption bracing piece has good damping power consumption ability. The bridge deck is deformed due to vehicle load, generated vibration can be transmitted to the energy consumption supporting rods from the I-shaped beam through the anti-buckling component in a centralized manner, the energy consumption supporting function is realized under the action of hydraulic oil and a return spring in the energy consumption supporting rods, the actual action conditions of large downward vibration displacement and small upward vibration displacement of the energy consumption supporting rods are self-adapted through the combined design of the two cylinder bodies in the energy consumption supporting rods, the piston rods are quickly reset, and the effect of vibration and energy consumption reduction capacity is improved;

2. the buckling-restrained beam has the advantages that the buckling-restrained members are symmetrically arranged at the two piers, so that the resisting moment of the end part is effectively increased, and the bending-resistant and torsion-resistant bearing capacity of the I-beam is improved;

3. the utility model discloses from cutting curved section bucking mechanism angle and considering, web bucking is mainly that the pressure that closes of the main compressive stress that is formed by two-way shear force is sent, through the slant stiffening rib board that sets up along web main compressive stress direction, anti main pressure bearing capacity has directly been strengthened greatly, the web has been strengthened and has resisted the bucking ability, and simultaneously, when shearing the crack appears in the web through horizontal stiffening rib board, effectively restrain fissured development, thereby, through adopting "cross" stiffening rib board structure and hugging closely the web, the integral structure's of the buckling-restrained component on the upper and lower edge of a wing combination arrangement form, can play increase web thickness, improve I-beam overall stability's effect.

Drawings

Fig. 1 is a schematic perspective view of the energy dissipation supporting device of the present invention;

fig. 2 is a schematic structural view of the energy dissipation support device of the present invention;

FIG. 3 is a schematic view of the internal structure of the energy-consuming supporting rod of the present invention;

FIG. 4 is a schematic view of the installation of the present invention when applied to a steel plate composite girder bridge;

FIG. 5 is a side view schematic of the structure of FIG. 4;

FIG. 6 is a schematic structural view of one side beam end portion of the I-beam in FIG. 4;

fig. 7 is a basic dimension diagram for verifying a beam bridge model according to the present invention;

fig. 8 is a comparison diagram of the vertical displacement of the bridge span between the front and the rear of the bridge.

In the figure, 1 bridge deck; 2, an I-beam; 3, a cross beam; 4 a buckling restrained member; 5, an upper bottom plate; 6, a bottom end sealing plate; 7 vertical plates; 8 oblique stiffening rib plate; 9 transverse stiffening rib plates; 10 energy dissipation support rods; 11 sealing the sleeve; 12 a piston rod; 13 a first cylinder; 14 a second cylinder; 15 a first piston; 16 a first return spring; 17 a second piston; 18 a second return spring; 19 a first chamber; 20 a second chamber; 21 oil passing holes; 22 anti-slip ring; 23 sealing the rubber ring; 24, hinging seat is arranged; 25, connecting pieces are arranged; 26, a lower hinged support; 27 lower connecting pieces; 28 high strength bolt.

Detailed Description

To make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the embodiments of the present invention are combined to clearly and completely describe the technical solution in the embodiments of the present invention, and obviously, the described embodiments are some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by a person skilled in the art without making creative efforts belong to the protection scope of the present invention.

In order to reduce the damage caused by vibration to the bridge structure, reduce the earthquake effect and the driving vibration effect, reduce the structural maintenance and management cost, and improve the driving comfort of passengers, the vibration reduction of the steel plate composite beam bridge is studied in the embodiment, please refer to fig. 1 to 6, and the energy dissipation supporting device for preventing the buckling of the web plate of the steel plate composite beam bridge of the embodiment is structurally arranged as follows:

a pair of I-beam 2 is horizontal symmetrical arrangement, sets firmly the lower extreme at concrete bridge panel 1, and the roof beam body extends to concrete bridge panel 1 both ends along vertical, on every I-beam 2, is the symmetry and sets up a pair of power consumption strutting arrangement of installing at the beam-ends portion, and power consumption strutting arrangement includes:

the pair of buckling-restrained components 4 are symmetrically arranged on two sides of a web plate of the I-beam 2 and used for transmitting vibration of the concrete bridge deck 1 from the I-beam 2 to the energy-consuming support rod 10 below in a centralized manner, the buckling-restrained components 4 on each side are tightly attached to the web plate and upper and lower flanges and fixedly supported between the upper and lower flanges, the whole structure is of an isosceles trapezoid without a lower bottom, a through frame is formed between each side of the trapezoid, cross-shaped stiffening rib plate structures are arranged in two waists, the outer edge of the bottom end of the waist on the outer side is flush with the beam end, and the waist on the inner side is used for connecting the energy-consuming support rod 10;

the energy-consuming support rod 10 is used as an energy-consuming support structure, a support rod main body inclines downwards and outwards towards a bridge pier at an inclination angle of 45 degrees, the upper end and the lower end of the support rod main body are respectively hinged and supported between the bottom end of the lower flange of the I-shaped beam 2 and the bridge pier through an upper hinged support and a lower hinged support, and the top end of an upper hinged support 24 is fixedly connected with the bottom end of the lower flange of the I-shaped beam 2 and the bottom end of the inward side waist of the pair of anti-buckling components 4; the support rod main body is provided with a vibration damping and energy consuming mechanism, which comprises a sealing sleeve 11, a piston rod 12, a first cylinder body 13, a second cylinder body 14, a first piston 15, a second piston 17, a first return spring 16 and a second return spring 18, wherein the first cylinder body 13, the second cylinder body 14, the first piston 15, the second piston 17, the first return spring 16 and the second return spring 18 are positioned in the sealing sleeve 11, the piston rod 12 is axially movably sleeved in the sealing sleeve 11, the top of the sealing sleeve is upward and exposed, the first cylinder body 13 at the top end, the second cylinder body 14 at the bottom end and the cylinder bottom of the sealing sleeve 11 are separated to form a first cavity 19 and a second cavity 20 which are independent, and are respectively filled with hydraulic oil, in the first cavity 19, the first cylinder body 13 is fixedly sleeved on the piston rod 12 and forms a synchronous axial displacement component together with the piston rod 12, the first piston 15 is movably sleeved on the piston rod 12, and is respectively tensioned with the first return spring 16 which is arranged in parallel to the axial direction between the first cylinder body 13 and the second cylinder body 14, in the second cavity 20, the second cylinder 14 is coaxially and fixedly connected to the inner wall of the sealing sleeve 11, the piston rod 12 axially passes through the second cylinder 14 in a displaceable manner, the tail end of the piston rod is fixedly sleeved with a second piston 17, and the second piston 17, the second cylinder 14 and the bottom of the sealing sleeve 11 are respectively tensioned by a plurality of second return springs 18 which are arranged in parallel to the axial direction.

The utility model discloses a structural feature also lies in:

in the anti-buckling component 4, an upper base plate 5 of an isosceles trapezoid is tightly attached and fixedly connected to the bottom end face of an upper flange of the I-beam 2, bottom end seal plates 6 of two waists are tightly attached and fixedly connected to the bottom end face of a lower flange of the I-beam 2, a through frame is formed between the two waists and the upper base of the trapezoid, a vertical plate 7 is parallel to a web plate and is arranged on one side end face opposite to the web plate, the vertical plate is tightly attached and fixedly connected to the web plate of the I-beam 2, and the other side end face is open; in the anti-buckling component 4, the lengths of the rest plates parallel to the surface of the upper bottom plate 5 are half of the length of the upper bottom plate 5;

the cross stiffening rib plate structure in the waist of both sides is the symmetry setting, all be in every side waist, between the bottom shrouding 6 middle part and the upper plate 5 of waist, be on a parallel with the waist and set up one slant stiffening rib plate 8, at isosceles trapezoid's middle part high position department, transversely draw one horizontal stiffening rib plate 9 in the waist, link firmly with slant stiffening rib plate 8 and constitute "cross" stiffening rib plate structure for improve web and edge of a wing buckling-restrained ability, prevent the buckling deformation on I-beam 2 web and the edge of a wing, delay its shear crack's development simultaneously. Specifically, the oblique stiffening rib plates 8 and the transverse stiffening rib plates 9 are distributed in a crossed manner in the waist, so that a supporting effect similar to a truss is achieved, the rigidity is increased, and the bending resistance and bearing capacity of the combined beam bridge is improved. Meanwhile, the oblique stiffening ribs at the reserved holes on the bottom end sealing plate 6 of the waist can concentrate vibration load of the bridge deck and transmit the vibration load to the upper hinged support 24, energy consumption efficiency is increased, reaction of the energy consumption supporting rods 10 is uniformly transmitted back to the bridge deck, and the effect of improving driving stability is achieved.

In the energy consumption support bar 10:

the top of the piston rod 12 is exposed and is hinged to an upper hinge base 24 through an upper connecting piece 25, and the bottom of the sealing sleeve 11 is hinged to a lower hinge base 26 through a lower connecting piece 27;

the elastic modulus of the first return spring 16 is greater than that of the second return spring 18, and the plurality of first return springs 16 and the plurality of second return springs 18 are arranged in parallel to the axial direction and are respectively distributed around the central axis of the piston rod 12 at equal intervals in the circumferential direction;

a plurality of oil passing holes 21 are uniformly distributed on the first piston 15 and the second piston 17 respectively; in the initial state, the first piston 15 is located at the middle position of the piston rod 12, and the second piston 17 is located at the middle position of the second chamber 14.

Anti-skid rings 22 are arranged between the second piston 17 and the cylinder wall of the sealing sleeve 11 and between the first piston 15 and the cylinder wall of the sealing sleeve 11;

the second cylinder 14 is corresponding to the penetration of the piston rod 12, the first cylinder 13 is corresponding to the penetration of the piston rod 12, and the top end of the sealing sleeve 11 is corresponding to the penetration of the piston rod 12, and are respectively sealed by a sealing rubber ring 23.

The top end of the upper hinge seat 24, the bottom flange of the i-beam 2 and the middle position of the bottom end of the inward one side waist of the pair of buckling-restrained components 4 are provided with vertically through upper holes, and the upper holes are fastened through high-strength bolts 28 which are threaded in the upper holes.

The middle position of the mounting end of the lower hinged support 26 and the position corresponding to the pier are provided with a transversely through lower hole channel, and the lower hole channel are fastened through a lower high-strength bolt 28 which is threaded in the lower hole channel. The bottom of the sealing sleeve 11 is hinged to the lower hinge base 26 by a lower connecting piece 27.

A pair of I-shaped steel beams are transversely and fixedly connected through a cross beam 3.

The working principle is as follows:

and each section of the I-shaped beam intensively transmits the vibration of the concrete bridge deck to the energy dissipation support rods below the I-shaped beam through a pair of buckling-restrained components.

When the generated downward or upward vibration is small, the piston rod moves towards the inside of the sealing sleeve along the axial direction, the first cylinder body and the second piston synchronously move along the axial direction along with the piston rod, the shearing and extrusion effects are respectively formed on the hydraulic oil in the first cavity and the hydraulic oil in the second cavity, the energy consumption effect is achieved, and the piston rod can rapidly reset under the elastic force action of the first reset spring and the second reset spring;

considering that in practice, large downward vibration can be generated, at the moment, the piston rod, the first cylinder body and the second piston synchronously move towards the inside of the sealing sleeve along the axial direction, the first cylinder body and the second piston respectively perform shearing and extruding actions on hydraulic oil in the first cavity and the second cavity to finish vibration reduction and energy consumption in the first stage, but the piston rod rapidly resets under the elastic force action of the first return spring and the second return spring due to large vibration, and then the first piston continuously moves along the axial direction under the action of the first return spring above the first piston to continuously shear and extrude the hydraulic oil in the first cavity to perform vibration reduction and energy consumption in the second stage, and resets under the action of the first return spring below the first piston and the second return spring above and below the second piston.

Namely, when the external excitation action is small, only part of energy consumption actions of the energy consumption supporting rods are triggered, and the energy consumption supporting rods are reset quickly to adapt to the actual condition of action cyclic change; but when the external excitation effect is great, will trigger the whole power consumption effect of power consumption bracing piece, provide stronger power consumption effect and bigger restoring force, the energy dissipates in a large number, and the dynamic response of structure obtains quick decay, effectively reduces the vibration. Therefore, the combination of the buckling-restrained component and the energy-consumption support rod is adopted, the buckling-restrained capacity of the web plate and the bearing capacity of other beams are improved, meanwhile, the energy-consumption effect under the vibration effect can be enhanced, the vibration of the bridge is reduced, and therefore the safe driving of the vehicle is guaranteed.

Application example:

as shown in fig. 7, the basic dimensions of the finite element model of the steel plate composite girder bridge are as follows:

length of concrete bridge deck30000mm, 12000mm and 400mm in the order of width and height, and C50 concrete with an elastic modulus Ex of 3.45 × 10¹⁰N/m²Poisson's ratio v is 0.2 and density dens is 2700kg/m³；

The I-beam adopts Q345D, and the elastic modulus Ex thereof is 2 multiplied by 10¹¹N/m²Poisson's ratio is 0.245, density dens is 7850kg/m³(ii) a The upper flange plate thickness T1 is T2-20 mm, the web plate thickness T3 is 20mm, the I-steel width W1 is W2-800 mm, the height W3 is 1800mm, and the length is 35000 mm;

the beam is a Q345D steel beam with a rectangular cross section of 600mm multiplied by 30 mm.

The device is placed at the end part of an I-beam, and a multi-body dynamics software is used for solving a cross-span vertical displacement comparison curve of a bridge before and after the device is applied by taking a truck (not considering the irregularity of the road surface) with the speed of 120km/h as an example when the truck runs across a four-span continuous beam bridge at a constant speed, as shown in fig. 8. The absolute value of the vertical displacement peak value in the span of the steel-concrete composite girder bridge without the device is 2.55mm, and the absolute value of the vertical displacement peak value in the span of the steel-concrete composite girder bridge without the device is 2.29 mm. The vibration damping rate of the displacement difference value of the steel-concrete composite beam bridge applying the device reaches 10.20 percent, and the vibration damping effect is obvious.

While embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that: various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.

Claims (8)

1. The utility model provides an energy consumption strutting arrangement of web buckling prevention of steel sheet combination beam bridge, characterized by, a pair of I-beam be horizontal symmetrical arrangement, set firmly the lower extreme at the decking, the roof beam body is along longitudinally extending to decking both ends, on every I-beam, is the symmetry and divides a pair of energy consumption strutting arrangement who installs at beam-ends portion, energy consumption strutting arrangement includes:

the pair of buckling-restrained components are symmetrically arranged on two sides of a web plate of the I-beam and are used for transmitting vibration of a bridge deck plate from the I-beam to energy-consuming support rods below the I-beam in a centralized manner, the buckling-restrained components on each side are tightly attached to the web plate and upper and lower flanges and fixedly supported between the upper and lower flanges, the buckling-restrained components on each side are integrally in an isosceles trapezoid structure without a lower bottom, a through frame is formed between each side of the trapezoid, cross-shaped stiffening rib plate structures are arranged in two waists, the outer edge of the bottom end of the waist on the outward side is flush with the beam end, and the waist on the inward side is used for connecting the energy-consuming support rods;

the energy-consuming support rod is used as an energy-consuming support structure, the support rod main body inclines downwards and outwards towards the pier at an inclination angle of 45 degrees, the upper end and the lower end of the support rod main body are respectively hinged and supported between the bottom end of the flange of the I-beam lower flange and the pier through an upper hinged support and a lower hinged support, and the top end of the upper hinged support is fixedly connected with the flange of the I-beam lower flange and the bottom ends of the inward side waists of the pair of anti-buckling components; the main body of the support rod is provided with a vibration damping and energy dissipating mechanism which comprises a sealing sleeve, a piston rod, a first cylinder body, a second cylinder body, a first piston, a second piston, a first return spring and a second return spring, wherein the first cylinder body, the second cylinder body, the first piston, the second piston, the first return spring and the second return spring are positioned in the sealing sleeve, the piston rod is axially and movably sleeved in the sealing sleeve, the top of the piston rod is upward and exposed, a first cavity and a second cavity which are independent are formed in the sealing sleeve by separating the first cylinder body at the top end part, the second cylinder body at the bottom end part and the cylinder bottom of the sealing sleeve and are respectively filled with hydraulic oil, the first cylinder body is fixedly sleeved on the piston rod in the first cavity and forms a synchronous axial displacement component with the piston rod, the first piston is movably sleeved on the piston rod and is tensioned with the first cylinder body and the second cylinder body respectively through a plurality of first return springs which are arranged in parallel to the axial direction, and in the second cavity, the second cylinder body is coaxially and fixedly connected with the inner wall of the sealing sleeve, the piston rod axially penetrates through the second cylinder body in a displaceable manner, the tail end of the piston rod is fixedly sleeved with the second piston, and the second piston, the second cylinder body and the bottom of the sealing sleeve barrel are respectively tensioned by a plurality of second return springs which are arranged in parallel to the axial direction.

2. The web buckling restrained energy dissipation brace apparatus of a steel plate composite girder bridge according to claim 1, wherein:

in the anti-buckling component, an upper bottom plate of an isosceles trapezoid is tightly attached to the bottom end face of an upper flange of an I-beam, bottom end sealing plates of two waists are tightly attached to the bottom end face of a lower flange of the I-beam, a through frame is formed between the two waists and the upper bottom of the trapezoid, a vertical plate is parallel to a web plate and is opposite to the end face of one side of the web plate, the vertical plate is tightly attached to the web plate of the I-beam, and the end face of the other side of the vertical plate is open;

the cross stiffening rib plate structures in the waist at two sides are symmetrically arranged, an oblique stiffening rib plate is arranged between the middle part of the bottom end sealing plate of the waist and the upper bottom plate in each side waist in parallel to the waist, and a transverse stiffening rib plate is transversely pulled in the waist at the middle height position of the isosceles trapezoid and fixedly connected with the oblique stiffening rib plate to form the cross stiffening rib plate structure.

3. The web buckling restrained energy dissipation brace apparatus of a steel plate composite girder bridge according to claim 1 or 2, wherein:

in the anti-buckling component, the lower base angle of the isosceles trapezoid is 45 degrees.

4. The web buckling restrained energy dissipation brace apparatus of a steel plate composite girder bridge according to claim 1, wherein in the energy dissipation brace rods:

the top of the piston rod is exposed and is hinged to the upper hinged support through an upper connecting piece, and the bottom of the sealing sleeve is hinged to the lower hinged support through a lower connecting piece;

the elastic modulus of the first reset spring is greater than that of the second reset spring, and the first reset springs and the second reset springs are arranged in parallel to the axial direction and are distributed at equal intervals in the circumferential direction around the central axis of the piston rod respectively;

a plurality of oil passing holes are uniformly distributed on the first piston and the second piston respectively; in the initial state, the first piston is located at the middle position of the piston rod, and the second piston is located at the middle position of the second chamber.

5. The web buckling restrained energy dissipation brace apparatus of a steel plate composite girder bridge according to claim 1, wherein:

anti-slip rings are arranged between the second piston and the wall of the sealing sleeve barrel and between the first piston and the wall of the sealing sleeve barrel;

the second cylinder body is corresponding to the piston rod penetrating position, the first cylinder body is corresponding to the piston rod penetrating position, and the top end of the sealing sleeve is corresponding to the piston rod penetrating position and is respectively sealed through a sealing rubber ring.

6. The web buckling restrained energy dissipation brace apparatus of a steel plate composite girder bridge according to claim 1, wherein:

and the top end of the upper hinged support, the lower flange of the I-beam and the middle position of the bottom end of the pair of anti-buckling components facing the inner side waist are provided with vertically through upper pore channels which are fastened by high-strength bolts penetrating through the upper pore channels through threads.

7. The web buckling restrained energy dissipation brace apparatus of a steel plate composite girder bridge according to claim 1, wherein:

and a lower through hole which is transversely communicated with the pier is formed in the middle of the lower hinged support mounting end and corresponds to the pier, and the lower through hole is fastened by a lower high-strength bolt which is arranged in the lower through hole in a penetrating manner through threads.

8. The web buckling restrained energy dissipation brace apparatus of a steel plate composite girder bridge according to claim 1, wherein: and the pair of I-shaped steel beams are transversely and fixedly connected through the cross beam.

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