CN109487703B - A function-separated self-resetting shock-absorbing bridge and its installation method - Google Patents

Abstract

A function-separated self-resetting shock-absorbing bridge and its installation method, including an abutment, a bridge pier, a main girder, an abutment, a sliding support for vertically supporting the main girder at the pier, and a horizontal self-resetting energy-dissipating shock-absorbing system connecting the main girder . The self-resetting energy-dissipating shock-absorbing system is composed of a self-resetting energy-dissipating damper and an acceleration-related locking device connected in series. A serial positioning device is arranged at the series connection and fixed at the bottom of the main beam. The self-resetting energy-dissipating shock-absorbing system is connected to It is hinged with the abutment, pier and main girder; the axis of the self-resetting energy-dissipating shock absorbing system is arranged at a certain angle to the axis of the main girder; the acceleration-related locking device can adapt to the temperature deformation of the bridge during normal operation, and is instantly activated when an earthquake occurs, automatically The reset energy-dissipating damper starts to work; the sliding support and the self-resetting energy-dissipating damping system realize the separation of vertical and horizontal functions. The invention can effectively limit the relative displacement of the pier beam under the earthquake action, reduce the earthquake damage of the pier, and ensure that the bridge structure can be restored to traffic after the earthquake.

Description

A function-separated self-resetting shock-absorbing bridge and its installation method

technical field

The invention relates to a bridge structure system, in particular to a function-separated self-resetting shock-absorbing bridge used in conjunction with a self-resetting energy-consuming damper, an acceleration-related locking device, a series positioning device and a sliding support.

Background technique

The improvement of the seismic performance of the existing bridge structure system is mainly realized by setting shock-absorbing measures such as shock-absorbing and isolating bearings and elastic-plastic blocks. The seismic displacement response of the beam body of the bridge adopting these shock-absorbing measures is relatively large, which is extremely large. It is easy to cause the damage of the support and the occurrence of earthquake damage such as falling beams. In addition, these traditional shock absorption measures have a large residual displacement of the main girder after the earthquake, which cannot restore the bridge structural system to its original state, and it is difficult to meet the requirements of emergency operation after the earthquake. For this reason, referring to the "function separation" seismic design concept adopted in Japan and my country's high-speed rail bridges, a self-resetting shock-absorbing bridge with function separation is proposed. Load, the horizontal displacement of the main girder is controlled by the self-resetting energy-dissipating shock-absorbing system, so as to realize the separation of vertical and horizontal functions.

Contents of the invention

The object of the present invention is to provide a function-separated self-resetting damping bridge and its installation method.

The present invention is a function-separated self-resetting shock-absorbing bridge and an installation method thereof. The function-separated self-resetting shock-absorbing bridge includes abutment 1, bridge pier 2, main girder 3, and abutment 1 and bridge pier 2 vertically supporting the main girder. The sliding support 4 and the self-resetting energy-dissipating shock absorbing system 5 connected to the main beam; the self-resetting energy-dissipating shock-absorbing system 5 is composed of a self-resetting energy-dissipating damper 7, an acceleration-related locking device 8, and a series positioning device 9, and the series positioning The device 9 is a round stainless steel cylinder, the middle point of the outside of the steel cylinder is welded to the connecting member 6, and the self-resetting energy dissipation damper 7 and the acceleration-related locking device 8 are connected in series by bolts, and are positioned in series at the serial position The device 9 forms a self-resetting energy-dissipating shock-absorbing system 5; the connected self-resetting energy-dissipating shock-absorbing device system 5 is hingedly connected to the abutment 1, pier 2 and main girder 3 through the connecting member 6; the self-resetting energy-dissipating shock-absorbing The layout of system 5 at the bottom of the beam is arranged parallel to the 3-axis of the main beam along the longitudinal direction of the bridge, perpendicular to the 3-axis of the main beam along the transverse direction of the bridge, or arranged at a certain angle θ with the 3-axis of the main beam, and the value range of θ is 0° ~90°.

The installation method of the function separation type self-resetting damping bridge of the present invention, its steps are:

(1) Self-resetting energy-dissipating damping system: select self-resetting energy-dissipating damper 7, acceleration locking device 8, and series positioning device 9 according to design requirements; use bolts to connect self-resetting energy-dissipating damper 7 and acceleration-related locking device 8 are connected in series, and the positioning device 9 is placed in series on the series part to form a self-resetting energy-dissipating shock absorbing system 5;

(2) Connecting member 6: According to the differences in the longitudinal and lateral seismic risks of the bridge structure, determine the arrangement position of the self-resetting energy-dissipating shock-absorbing system 5 on the main girder 3 and the pier 2 or the platform, and make the connecting member with steel according to the design requirements 6, and use high-strength bolts to install the connecting member 6 at the arrangement position of the abutment 1, pier 2, and main girder 3;

(3) Overall assembly: use bolts to connect the self-resetting energy dissipation damping system 5 with the connection members 6 at the abutment 1, pier 2, and main girder 3, and use bolts to connect the connection member 6 welded outside the serial positioning device 9 to the main girder. Beams 3 are connected at the bottom.

The advantages of the present invention are: 1) Under the effects of temperature, shrinkage and creep, the sliding support meets the small deformation requirement of normal use. 2) Under the action of live loads such as vehicles, wind, and earthquakes, the acceleration-related locking device is instantly activated, making its mechanical properties change from flexible to rigid, so as to ensure that the deformation and energy consumption between the pier (platform) beams are all self-resetting. It can be borne by the shock-absorbing system, thereby reducing the earthquake damage of the bridge pier. 3) For the continuous beam structure system, each pier bears the force jointly and jointly bears the earthquake force. 4) Dissipate the energy input by the earthquake through the self-resetting energy-dissipating damper, reduce the earthquake damage of the bridge structure, and realize the post-earthquake functional recovery of the bridge structure, so as to meet the requirements of emergency operation after the earthquake.

Description of drawings

Fig. 1 is a structural schematic diagram of a function-separated self-resetting shock-absorbing bridge system of the present invention, and Fig. 2 is a structural schematic diagram of two self-resetting energy-dissipating shock-absorbing systems arranged between the main girder and the abutment in a function-separated self-resetting shock-absorbing bridge , Figures 3 and 4 are schematic diagrams of the layout of multiple self-resetting energy-dissipating damping systems between the main girder and the pier in a function-separated self-resetting damping bridge. Reference signs and corresponding names are: 1. Abutment, 2. Pier, 3. Main girder, 4. Sliding support, 5. Self-resetting energy-dissipating damping system, 6. Connecting member, 7. Self-resetting energy-dissipating damping Device, 8, acceleration-related locking device, 9, serial positioning device.

Detailed ways

As shown in Figures 1 to 4, the present invention is a function-separated self-resetting damping bridge and its installation method, a function-separating self-resetting damping bridge, abutment 1, pier 2, main girder 3 and abutment 1, The sliding support 4 vertically supporting the main girder at the two piers and the self-resetting energy-dissipating shock absorbing system 5 connecting the main girder; , a series positioning device 9, the series positioning device 9 is a circular stainless steel cylinder, the middle point outside the steel cylinder is welded to the connecting member 6, and the self-resetting energy dissipation damper 7 and the acceleration-related locking device 8 are connected in series by bolts At the same time, put the positioning device 9 in series on the serial part to form a self-resetting energy-dissipating shock-absorbing system 5; connect the connected self-resetting energy-dissipating shock-absorbing system 5 to the abutment 1, pier 2 and main girder 3 through the connecting member 6 Hinged connection; the layout of the self-resetting energy-dissipating shock absorbing system 5 at the bottom of the beam is arranged parallel to the 3-axis of the main girder along the longitudinal direction of the bridge, perpendicular to the 3-axis of the main girder along the transverse direction of the bridge, or arranged at a certain angle θ with the 3-axis of the main girder , the value range of θ is 0°~90°.

The invention relates to a self-resetting energy-consuming damper, an acceleration-related locking device, a series positioning device and a sliding support used in conjunction with a function-separated self-resetting shock-absorbing bridge, which can not only adapt to the temperature, shrinkage and creep of the beam body. It can shrink freely, and can effectively limit the relative displacement of the pier beam under the earthquake, and reduce the damage of the bridge structure. For the continuous girder bridge structure system, the function-separated self-resetting shock-absorbing bridge enables the fixed piers and movable piers of the continuous girder bridge to bear the force together, avoiding the independent force of the fixed pier. At the same time, the bridge structure is restored to its original state through the self-resetting energy-dissipating shock absorbing system, so that the bridge structure can be resumed to traffic as soon as possible after the earthquake. The invention is applicable to the anti-seismic and anti-seismic design measures of new bridges and the anti-seismic reinforcement of existing bridges.

As shown in Figures 1 to 4, when the longitudinal earthquake risk of the bridge system is higher than the transverse earthquake risk, the angle θ between the self-resetting energy-dissipating shock-absorbing system 5 and the axis of the main beam 3 ranges from 0° to 45° ° range; when the lateral seismic risk of the bridge system is higher than the longitudinal seismic risk of the bridge, the value of the included angle θ between the self-resetting energy-dissipating shock-absorbing system 5 and the axis of the main beam 3 is within the range of 45° to 90°; When the longitudinal and lateral seismic risks of the bridge system are equal or the longitudinal and lateral seismic risks are uncertain, the 5-axis 5 of the self-resetting energy-dissipating shock-absorbing system and the 3-axis of the main beam are arranged at an angle of 45°; several of them are typical The situation is as follows: θ = 0° means that the self-resetting energy-dissipating damping system 5 is only arranged in the longitudinal direction of the bridge structure, that is, the self-resetting energy-dissipating damping system 5 is arranged along the longitudinal direction of the bridge parallel to the main beam 3 axis; θ = 90° means that only in the The self-resetting energy-dissipating and shock-absorbing system 5 is arranged laterally on the bridge, that is, the self-resetting energy-dissipating and shock-absorbing system 5 is arranged along the horizontal direction of the bridge along the axis vertical to the main girder 3 .

As shown in Figures 1 to 4, the acceleration-dependent locking device 8 in the self-resetting energy-dissipating damper system 5 is hinged to the end of the self-resetting energy-dissipating damper 7, and a set is provided at the hinge to prevent the lateral instability of the series system. The serial positioning device 9 is a cylindrical stainless steel cylinder, and the connecting member 6 is welded outside the steel cylinder, and the connecting member 6 is connected to the bottom of the main beam 3 by bolts.

As shown in Figures 1 to 4, the acceleration-dependent locking device 8 in the self-resetting energy-dissipating shock absorbing system 5 should be selected to be in a free-to-expand state under the action of temperature and shrinkage creep, without generating secondary internal forces, and to be in a state of vibration during earthquakes. , Locking device that will be activated instantaneously under high-speed live load conditions.

As shown in Figures 1 to 4, the self-resetting energy-dissipating damper 7 in the self-resetting energy-dissipating shock absorbing system 5 is selected from a self-resetting friction damper and a self-resetting energy-dissipating support with self-resetting and energy-dissipating characteristics.

As shown in Figures 1 to 4, the sliding bearing 4 is a plate rubber bearing or a polytetrafluoroethylene sliding plate rubber bearing.

As shown in Figures 1 to 4, the bridge pier 2 is a solid reinforced concrete pier of gravity type; the abutment 1 is a gravity type abutment.

As shown in Figures 1 to 4, the structural system is a simply supported girder bridge and a continuous girder bridge system; for the self-resetting energy-dissipating damper 7 in the self-resetting energy-dissipating damping system 5 provided at the abutment of the continuous girder bridge Can be replaced with a dissipative damper.

The installation method of the function separation type self-resetting damping bridge of the present invention, its steps are:

(1) Self-resetting energy-dissipating damping system: select self-resetting energy-dissipating damper 7, acceleration locking device 8, and series positioning device 9 according to design requirements; use bolts to connect self-resetting energy-dissipating damper 7 and acceleration-related locking device 8 are connected in series, and the positioning device 9 is placed in series on the series part to form a self-resetting energy-dissipating shock absorbing system 5;

(2) Connecting member 6: According to the differences in the longitudinal and lateral seismic risks of the bridge structure, determine the arrangement position of the self-resetting energy-dissipating shock-absorbing system 5 on the main girder 3 and the pier 2 or the platform, and make the connecting member with steel according to the design requirements 6, and use high-strength bolts to install the connecting member 6 at the arrangement position of the abutment 1, pier 2, and main girder 3;

(3) Overall assembly: use bolts to connect the self-resetting energy dissipation damping system 5 with the connection members 6 at the abutment 1, pier 2, and main girder 3, and use bolts to connect the connection member 6 welded outside the serial positioning device 9 to the main girder. Beams 3 are connected at the bottom.

As shown in Figure 1, the self-resetting energy-dissipating damper 7, the acceleration-related locking device 8, the series positioning device 9 and the sliding support 4 are used in conjunction with a function-separated self-resetting shock-absorbing bridge, including: abutment 1 and pier 2 , the main girder 3, the abutment 1, and the pier 2 vertically support the sliding bearing 4 of the main girder and the horizontal self-resetting energy dissipation shock absorption system 5 connecting the main girder. The self-resetting energy-dissipating shock absorption system 5 is composed of a self-resetting energy-dissipating damper 7, an acceleration-related locking device 8 and a series positioning device 9. The series positioning device 9 is a circular stainless steel cylinder, and the midpoint of the outside of the steel cylinder is welded. The connecting member 6 uses bolts to connect the self-resetting energy-dissipating damper 7 and the acceleration-related locking device 8 in series, and puts the positioning device 9 in series on the serial part to form a self-resetting shock absorbing system 5; the connected self-resetting damper The seismic system 5 is hingedly connected with the abutment 1, the bridge pier 2 and the main girder 3 through the connecting member 6. The arrangement form of the self-resetting energy-dissipating damping system 5 at the bottom of the beam is arranged parallel to the 3-axis of the main beam along the longitudinal direction of the bridge, vertical to the 3-axis of the main beam along the transverse direction of the bridge, or arranged at a certain angle θ with the 3-axis of the main beam. The value range is 0°~90°.

The function-separated self-resetting shock-absorbing bridge using the above-mentioned self-resetting energy-dissipating damper 7, acceleration-related locking device 8, series positioning device 9 and sliding support 4 can effectively limit the relative displacement of the pier beam under the action of an earthquake, reducing The earthquake damage of the small pier 2 makes the pier 2 in an elastic state. In addition, the self-resetting energy-dissipating shock-absorbing system 5 can control the residual displacement and realize the function recoverability of the bridge structure after the earthquake.

A self-resetting energy-dissipating shock-absorbing system 5 for dissipating seismic energy and limiting the displacement of the main girder 3 is arranged between the abutment 1 , the pier 2 and the main girder 3 . Among them, the self-resetting energy-dissipating damper 7 is used to dissipate seismic energy to reduce the seismic force transmitted from the substructure to the superstructure, limit the excessive longitudinal and lateral displacement of the main girder, and reduce or even eliminate the vibration of the main girder 3 after the earthquake. Longitudinal and lateral displacement restores the bridge structure to its original state, which is conducive to the restoration of the bridge structure to traffic as soon as possible after the earthquake.

The end of the self-resetting energy-dissipating damper 7 is hinged with an acceleration locking device 8, which is in a free-to-expand state under the effects of temperature and shrinkage creep, and will be instantly activated under accelerations such as earthquake vibrations and high-speed live loads to make its mechanical The characteristic changes from flexibility to rigidity, thereby ensuring that the deformation and energy consumption between the main girder 3 and the bridge pier 2 (platform) are all borne by the self-resetting energy-dissipating shock-absorbing system 5 .

A series positioning device 9 for positioning and preventing lateral instability of the self-resetting damping system is provided at the hinge of the self-resetting energy-dissipating damper 7 and the acceleration-related locking device 8. The series positioning device 9 is a circular stainless steel cylinder. The connecting member 6 is welded at the outer midpoint position.

The sliding support 4 adopts a plate rubber bearing or a polytetrafluoroethylene plate rubber bearing, which is mainly used to bear the vertical load of the main beam without generating vertical load.

The layout of the self-resetting energy-dissipating damping system 5 at the bottom of the beam: according to the differences in the longitudinal and transverse earthquake risks of the bridge structure, determine the size of the angle θ between the self-resetting energy-dissipating damping system 5 and the axis of the main beam 3; When the earthquake risk is high, the angle between the self-resetting energy-dissipating shock-absorbing system 5 and the axis of the main beam 3 is in the range of 0°~45°; The included angle of beam 3 axis is in the range of 45°~90°; when the longitudinal and transverse earthquake risks are basically equal or the longitudinal and transverse earthquake risks are uncertain, the axis 5 of the self-resetting energy-dissipating shock absorption system is 45° to the axis 3 of the main beam layout.

The quantity of the self-resetting energy-dissipating shock-absorbing system 5 can be determined according to the design and calculation of the bridge's anti-seismic and shock-absorbing isolation. The oblique arrangement between the abutment, pier and main girder is shown in Fig. 2 and Fig. 3; when the number of self-resetting energy-dissipating shock-absorbing systems 5 exceeds two, the The broken-line layout is shown in Figure 4.

The connection mode of the self-resetting energy-dissipating shock-absorbing system 5 with the abutment 1, bridge pier 2, and main girder 3 is different depending on the object (new bridge structure or existing bridge structure):

First, for new bridges, the feature is that the connecting member 6 is pre-embedded at the abutment 1, pier 2, and main girder 3, and then the self-resetting energy-dissipating damping system 5 and the connecting member 6 of the embedded part are hinged through bolts. It is connected in a way to ensure that it will not be damaged by slipping or pulling out under rare earthquakes.

Second, for the existing bridge, it is characterized in that the connecting member 6 is installed at the existing abutment 1, bridge pier 2, and main girder 3, and then the self-resetting energy dissipation damping system 5 is connected with the connecting member 6 by bolts to ensure It does not slip or pull out under rare earthquakes.

The function-separated self-resetting shock-absorbing bridge including the self-resetting energy-dissipating damper, the acceleration-related locking device, the series positioning device and the sliding support proposed by the present invention can effectively improve the two-way seismic capacity of the bridge structure, The bridge can be restored to its original state after a rare earthquake and meet the requirements of emergency operation, that is, the invention can be used for the seismic design of new bridges or the seismic reinforcement of existing bridges.

The above are only specific embodiments of the present invention, and those skilled in the art may make some improvements or modifications without departing from the technical scope of the present invention. Therefore, the present invention is not limited to the above-mentioned embodiments, and any improvement or deformation made by those skilled in the art according to the technical scope of the present invention without departing from the scope of the present invention should fall within the protection scope of the present invention.

Claims (5)

1. A function-separated self-resetting damping bridge is characterized in that: abutment (1), pier (2), girder (3) and abutment (1), pier (2) place vertical support girder The sliding support (4) and the self-resetting energy-dissipating damping system (5) connecting the main beam; the self-resetting energy-dissipating damping system (5) consists of a self-resetting energy-dissipating damper (7), an acceleration-related locking device ( 8), the serial positioning device (9) is composed of a circular stainless steel cylinder, the midpoint outside the steel cylinder is welded to the connecting member (6), and the self-resetting energy dissipation damper (7) is connected by bolts. ) is connected in series with the acceleration-related locking device (8), and the positioning device (9) is placed in series at the serial position to form a self-resetting energy-dissipating shock-absorbing system (5); the connected self-resetting energy-dissipating shock-absorbing system ( 5) The abutment (1), pier (2) and main girder (3) are hingedly connected through the connecting member (6); ) axis is arranged along the longitudinal direction of the bridge, and the axis of the vertical main girder (3) is arranged along the transverse direction of the bridge or forms a certain angle θ with the axis of the main girder (3), and the value range of θ is 0°～90°. When the longitudinal earthquake risk of the bridge system is higher than the transverse earthquake risk, the value of the included angle θ between the self-resetting energy-dissipating shock-absorbing system (5) and the axis of the main beam (3) is in the range of 0° to 45°; In the case where the transverse seismic risk of the bridge system is higher than the longitudinal seismic risk of the bridge, the value of the included angle θ between the self-resetting energy-dissipating seismic system (5) and the axis of the main girder (3) is in the range of 45° to 90°; When the longitudinal and lateral seismic risks of the system are equal or the longitudinal and lateral seismic risks are uncertain, the axis of the self-resetting energy-dissipating seismic system (5) and the axis of the main beam (3) are arranged at an angle of 45°; several of them are typical The situation is as follows: θ=0° means that the self-resetting energy-dissipating damping system (5) is only arranged in the longitudinal direction of the bridge structure, that is, the self-resetting energy-dissipating damping system (5) is arranged along the longitudinal direction of the bridge parallel to the axis of the main girder (3); θ =90° means that the self-resetting energy-dissipating shock-absorbing system (5) is only arranged in the lateral direction of the bridge, that is, the vertical main girder (3) axis is arranged along the transverse direction of the bridge. The self-resetting energy-dissipating and shock-absorbing system (5); The acceleration-dependent locking device (8) in the damping system (5) is hinged to the end of the self-resetting energy-dissipating damper (7), and a series positioning device (9) to prevent lateral instability of the series system is provided at the hinge , the series positioning device (9) is a cylindrical stainless steel cylinder, and the connecting member (6) is welded outside the steel cylinder, and the connecting member (6) is connected to the bottom of the main beam (3) by bolts. The sliding bearing (4) adopts a plate rubber bearing or a polytetrafluoroethylene sliding plate rubber bearing. The bridge pier (2) adopts a gravity-type reinforced concrete solid bridge pier; the abutment (1) adopts a gravity-type abutment. 2. The function-separated self-resetting shock-absorbing bridge according to claim 1, characterized in that: the acceleration-related locking device (8) in the self-resetting energy-dissipating shock-absorbing system (5) should be selected in temperature, shrinkage It is a locking device that is in a state of free expansion and contraction under the action of creep, does not generate secondary internal force, and can be activated instantaneously under the conditions of earthquake vibration and high-speed live load. 3. The function-separated self-resetting damping bridge according to claim 1, characterized in that: the self-resetting energy-dissipating damper (7) in the self-resetting energy-dissipating shock-absorbing system (5) is selected to have self-resetting Self-resetting friction damper and self-resetting energy-dissipating support with energy dissipation characteristics. 4. The function-separated self-resetting damping bridge according to claim 1 is characterized in that: the structural system is a simply supported girder bridge and a continuous girder bridge system; The self-resetting energy-dissipating damper (7) in the system (5) can be replaced with an energy-dissipating damper. 5. A method for installing a function-separated self-resetting damping bridge, characterized in that the steps are: (1) Self-resetting energy-dissipating damping system: select self-resetting energy-dissipating damper (7), acceleration locking device (8), and series positioning device (9) according to design requirements; use bolts to install self-resetting energy-dissipating damper ( 7) It is connected in series with the acceleration-related locking device (8), and the series positioning device (9) is placed on the series part to form a self-resetting energy-dissipating shock absorption system (5); (2) Connecting member (6): According to the differences in the longitudinal and lateral seismic risks of the bridge structure, determine the arrangement position of the self-resetting energy-dissipating shock-absorbing system (5) on the main girder (3) and bridge pier (2) or platform, According to the design requirements, the connecting member (6) is made of steel, and the connecting member (6) is installed at the arrangement position of the abutment (1), bridge pier (2) and main girder (3) by using high-strength bolts; (3) Overall assembly: use bolts to connect the self-resetting energy-dissipating damping system (5) with the connecting member (6) at the abutment (1), pier (2) and main girder (3), and use bolts to position the series The connecting member (6) welded outside the device (9) is connected to the bottom of the main beam (3).

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