CN108729344B - A double-column bridge pier structure combined with vibration isolation - Google Patents

Abstract

The invention discloses a double-column bridge pier structure combined with vibration isolation, which relates to the technical field of vibration isolation in bridge engineering. The top and bottom of the pier are steel pipe concrete sections, and the ends are sealed by steel plates. The bottom of the pier is placed in the groove of the grooved steel backing plate of the upper cap, and is only connected by the angle steel damper. The groove of the grooved steel backing plate of the upper structure is placed on the top surface of the pier, and the roller vibration-isolation bearing is arranged between the upper cap and the lower cap, and stoppers are set at both ends of the lower cap. The double-column pier used in combination with swaying seismic isolation not only plays the role of base seismic isolation, but also makes the pier sway to protect the pier from plastic hinges, and is supplemented by a damping device to realize the function of dissipating seismic energy, so that The bridge structure has good seismic performance. The rational design of the double-column pier construction method combined with sway seismic isolation can make the main structure of the bridge after the earthquake less damaged, and the damaged angle steel damper is very convenient to replace and the maintenance cost is low.

Description

A double-column bridge pier structure combined with vibration isolation

technical field

The invention relates to the technical field of vibration reduction and isolation of bridge engineering, in particular to a double-column bridge pier with small damage and easy repair and combined application of swing vibration isolation.

Background technique

my country is located between the circum-Pacific seismic belt and the Eurasian seismic belt. Most of the country is an earthquake zone, especially the western part of my country is mostly a strong earthquake zone with frequent seismic activities. The bridge is a pivotal project of the traffic lifeline, and its construction cost is high. Once it is damaged by an earthquake, it will cause huge economic losses, and it is extremely difficult to repair after the earthquake. The number of casualties directly on the bridge was not many, but the economic losses and casualties caused by the damage and interruption of traffic lifelines were immeasurable, resulting in rescue personnel not being in place in time, and many people were exacerbated by the earthquake disaster because they did not receive timely rescue. At the same time, it is difficult to repair the damaged large bridges, which seriously affects the production and life in the disaster area and the post-disaster reconstruction work. The current seismic design of bridges is mainly based on the ductile seismic design of the hysteretic performance of reinforced concrete piers, but it is difficult to repair the damage and destruction of the plastic hinge area of bridge piers. For medium-short bridge piers in high-intensity areas, it is not economical to rely solely on enlarging the cross-section, and the ductility is difficult to guarantee. In view of the above problems, this paper applies the idea of seismic isolation and rocking structure to double-column piers, and proposes a construction method of double-column piers with combined application of rocking seismic isolation. The vibration-reducing and isolating swinging pier system can effectively release the bending moment at the pier top and pier bottom and dissipate the seismic energy, reduce the plastic deformation of the pier plastic hinge area, effectively control the response of the pier in the earthquake, and achieve the purpose of seismic design of the bridge.

Contents of the invention

In order to solve the existing problems of reinforced concrete piers in the seismic design of bridges described in the background technology, the present invention proposes a double-column pier construction method combined with vibration isolation, which can reduce the lateral bending stiffness of the pier and prolong the structural period It can isolate the vibration by swinging, and can release the bending moment of the pier top and pier bottom, and also provides the ability of self-resetting. The angle steel damper is attached to dissipate the seismic energy, which can effectively improve the seismic performance of the bridge structure. Realize the joint application of "shock absorption" and "seismic isolation" in the anti-seismic of bridge piers, effectively control the damage of bridge structures under earthquake action, and ensure the recoverable function of bridge structures.

In order to achieve the above purpose, the present invention provides a double-column pier structure for joint application of rocking isolation, which mainly includes superstructure 1, bridge pier 2, upper bearing platform 3, lower bearing platform 4, pile foundation 5, roller bearing isolation The support 6 and the angle steel damper 11; the bridge pier 2 is placed on the upper cap 3, and the side of the bridge pier 2 and the top of the upper cap 3 are connected by the angle steel damper 11; the superstructure 1 is placed on the bridge pier 2 without any fixed connection Measures: a roller bearing 6 is arranged between the upper bearing platform 3 and the lower bearing platform 4, and the pile foundation 5 is placed under the lower bearing platform 4.

In the double-column bridge pier structure for the joint application of swing and seismic isolation, the top and bottom of the bridge pier 2 are wrapped by a steel cylinder 9 with one end sealed; The backing plate 8; the bottom surface of the pier 2 is placed in the groove of the grooved steel backing plate 8 of the upper cap 3; the groove of the grooved steel backing plate 8 of the superstructure 1 is placed on the top surface of the pier 2, That is, the top surface of the pier 2 bears against the groove of the grooved steel backing plate of the superstructure 1;

In the double-column pier structure for the joint application of sway and seismic isolation, upward stoppers 7 are arranged at both ends of the lower cap 4, and a distance is set between the stopper 7 and the side of the upper cap 3, and the distance is set to be less than The ultimate displacement of the roller vibration-isolation bearing 6.

In the double-column bridge pier structure for the joint application of rocking vibration isolation, the roller vibration isolation support 6 is composed of an upper concave plate 14, a lower concave plate 15 and a cylindrical roller 16; the upper concave plate 14 and the lower concave plate 15 The concave curve is consistent, and the form and parameters of the concave curve are determined by the isolation design. The top of the upper concave plate 14 is a plane, and the following is a concave surface; the bottom of the lower concave plate 15 is a plane, and the top is a concave surface. In the cavity, and can support the upper concave plate 14; the cylindrical roller shaft 16 of the roller vibration isolation bearing 6 is axially parallel.

In the double-column pier structure of the combination application of sway and seismic isolation, the angle steel damper 11 arranges circular openings 13 at the deformation concentration position to avoid stress concentration at this position, thereby improving the deformation capacity of the angle steel damper 11 .

The present invention adopts two bridge piers 2 arranged side by side.

The beneficial effects of the present invention are:

The unsupported double-column bridge pier structure of the present invention has a remarkable effect of shock absorption and isolation under earthquake action, which is mainly reflected in the following points:

1. Since the pier-cap and pier-superstructure are separate systems, the bending moment at the end of the pier can be effectively released during the earthquake, reducing damage to the pier, reducing the seismic force on the bridge structure, and dissipating it through the sway of the pier Seismic energy, effectively controlling the response of bridge piers in earthquakes.

2. The top of the upper cap is connected to the bridge pier by an angle steel damper, which can dissipate the earthquake energy, effectively control the development of plastic deformation of the bridge pier, concentrate the damage on the mild steel damper, and protect the bridge pier, and Mild steel dampers are easier to replace after an earthquake.

3. A roller bearing is installed between the lower bearing platform and the upper bearing platform to isolate the swing bridge and avoid large displacement and structural collapse of the structure caused by large pulse earthquakes.

4. The superstructure gravity and roller bearings provide the self-resetting ability of the bridge structure, effectively control the residual deformation of the bridge pier, ensure the traffic service function of the bridge structure after the earthquake, and reduce the post-earthquake repair work.

5. The present invention has little modification to the design of existing conventional bridge piers, is easy to implement, has a wide range of applications, and can reduce the design cross-section and reinforcement consumption of bridge piers; the damage after the earthquake is concentrated in the mild steel damper, and it can be used after a little repair. Ensure uninterrupted traffic lifeline, reduce post-earthquake repair costs and reconstruction time in disaster areas. Therefore, the present invention has good social and economic benefits and is worthy of popularization and application.

Description of drawings

Figure 1 is a schematic diagram of the cross-section of the double-column bridge pier structure combined with sway isolation; Figure 2 is a schematic diagram of the angle steel damper; Figure 3 is a schematic diagram of the cross-section of the roller bearing.

Explanation of reference signs:

1—upper structure; 2—bridge pier; 3—upper cap; 4—lower cap; 5—pile foundation; 6—roller isolation bearing; 7—block; 8— Steel backing plate with groove; 9—steel cylinder sealed at one end; 10—swing interface; 11—angle steel damper; 12—high-strength bolt; 13—circular opening; 14—upper concave plate; 15--lower concave plate; 16--cylindrical roller.

Detailed ways

The present invention is based on the conventional reinforced concrete double-column pier, and separates the bottom of the pier from the cap and the upper structure from the top of the pier and only connects them through an angle steel damper, so as to realize the rocking behavior of the pier to dissipate the seismic energy and has an automatic Reset function, and separate the bearing platform into two parts, and arrange the roller vibration isolation bearing between the two bearing platforms, so as to achieve the purpose of shock absorption and isolation of the structure. The structure is mainly used in bridge engineering and river-crossing engineering seismic isolation technology with high seismic performance requirements.

As shown in Fig. 1, Fig. 2, and Fig. 3, the present invention is a double-column bridge pier construction method for joint application of rocking isolation, including the rocking structure of piers-upper cap, the rocking structure of bridge piers-box girder and the upper and lower Seismic isolation measures between the caps. Figure 1 is a schematic diagram of the cross-section of the double-column bridge pier structure for combined application of sway seismic isolation, which is mainly composed of superstructure 1, bridge pier 2, upper bearing platform 3, lower bearing platform 4 and roller isolation bearing 6. The bridge pier 2 is placed on the upper bearing platform 3 and is only connected by the angle steel damper 11; the superstructure 1 is placed on the bridge pier 2 without any connection measures; the roller vibration isolation bearing is arranged between the upper bearing platform 3 and the lower bearing platform 4 6. The top and bottom of the pier 2 are wrapped by a steel cylinder 9 sealed at the end; the top of the upper cap 3 and the bottom of the superstructure 1 are arranged with a grooved steel backing plate 8 . The bridge pier 2 is placed on the grooved steel backing plate 8 of the upper cap 3 ; the superstructure 1 is placed on the bridge pier 2 at the position of the grooved steel backing plate 8 . The two ends of the lower bearing platform 4 are provided with stoppers 7, and a certain distance is set between the stoppers 7 and the upper bearing platform 3, and the setting of the spacing needs to be smaller than the limit displacement of the roller vibration-isolation bearing 6. FIG. 2 is a schematic diagram of the angle steel damper. The circular opening 13 is arranged at the deformation concentration point of the angle steel damper 11 to avoid stress concentration at this position, thereby improving the deformation capacity of the angle steel damper 11 . Fig. 3 is a cross-sectional schematic diagram of the roller vibration-isolation bearing, the roller vibration-isolation bearing 6 is composed of an upper concave plate 14, a lower concave plate 15 and a cylindrical roller 16; an upper concave plate 14 and a lower concave plate 15 Concave curves are consistent, and the form and parameters of the concave curve are determined by the isolation design. The upper concave plate 14 is connected with the upper platform 3 , and the lower concave plate 15 is connected with the lower platform 4 .

Under the action of the earthquake, the bottom of the bridge pier is separated from the bearing platform, causing the bridge pier to sway, and the foundation isolation is realized at the bearing platform, thereby prolonging the structural period of the bridge. The seat provides self-resetting ability, and the angle steel damper realizes energy dissipation ability. The introduction of the angle steel damper can be used as a fuse element to be damaged first, forming an effective protection for the pier, and the damage is easy to be found after the earthquake, and the replacement is less time-consuming. The double-column bridge pier structure mode of the combined application of swing and seismic isolation can reduce the lateral bending stiffness of the bridge pier, reduce the earthquake force borne by the bridge pier, and save the size of the cross-section of the bridge pier. The invention has good working performance under normal service load and accidental earthquake load, and is worthy of popularization and application in practical engineering.

Claims (5)

1. a kind of two-columned pier construction for waving shock insulation use in conjunction, mainly includes superstructure (1), bridge pier (2), upper cushion cap (3), lower cushion cap (4), pile foundation (5), rolling isolation support (6) and angle steel damper (11)；Bridge pier (2) is placed in cushion cap (3) on, the upper surface of the side of bridge pier (2) and upper cushion cap (3) are connected by angle steel damper (11)；Superstructure (1) is placed in On bridge pier (2)；Rolling isolation support (6) are arranged between upper cushion cap (3) and lower cushion cap (4), are pile foundation below lower cushion cap (4) Plinth (5)；Steel cylinder (9) are shut by one end and carry out end package in the top and bottom of bridge pier (2)；At the top of upper cushion cap (3) and top Structure (1) bottom is respectively provided with band groove billet (8)；The bottom surface of bridge pier (2) is placed in the band groove billet of cushion cap (3) (8) in groove；The groove with groove billet (8) of superstructure (1) is placed on the top surface of bridge pier (2), i.e. bridge pier (2) Top surface withstand the groove of superstructure (1) with groove billet.

2. it is described in accordance with the claim 1 it is a kind of wave shock insulation use in conjunction two-columned pier construction, which is characterized in that under hold The both ends of platform (4) are arranged upward block (7), are provided with spacing between block (7) and the side of upper cushion cap (3), the spacing Extreme displacement less than rolling isolation support (6) is set.

3. a kind of two-columned pier construction for waving shock insulation use in conjunction described in accordance with the claim 1, which is characterized in that roller bearing Shock isolating pedestal (6) is made of upper notch board (14), concave plate (15) and cylindrical roller bearing (16)；Upper notch board (14) and concave plate (15) Concave curve it is consistent, concave curve form and parameter are determined by shock design；The upper surface of upper notch board (14) is plane, and here is recessed Face；It is plane below concave plate (15), is above concave surface, upper notch board (14) and concave plate (15) are opposite up and down, and centre is formed Cavity, cylindrical roller bearing (16) is located in cavity, and can support notch board (14).

4. a kind of two-columned pier construction for waving shock insulation use in conjunction described in accordance with the claim 1, which is characterized in that angle steel Damper (11) is in deformation concentrated position arrangement circular opening (13), to avoid position stress concentration, to improve angle steel resistance The deformability of Buddhist nun's device (11).

5. a kind of two-columned pier construction for waving shock insulation use in conjunction described in accordance with the claim 1, which is characterized in that use Two bridge piers (2) discharged side by side.