Double-amplitude bridge transverse energy dissipation damper and construction and use method thereof

Abstract

The invention discloses a double-amplitude bridge transverse energy dissipation damper and a construction and use method thereof.The double-amplitude bridge transverse energy dissipation damper comprises steel plates, steel-concrete shear keys, prestressed steel bars, hyperelastic shape memory alloy bars and buckling-restrained steel sleeves, the two steel plates are arranged at the transverse closing position of two bridge towers of a double-amplitude bridge, and the multiple steel-concrete shear keys are installed on the outer sides of the two steel plates; the two ends of the prestressed steel bar penetrate through the two steel plates respectively and are anchored to the two bridge towers, the two ends of the hyperelastic shape memory alloy bar are fixedly connected to the side end faces of the two steel plates respectively, and the hyperelastic shape memory alloy bar is sleeved with the buckling-restrained steel sleeve. The invention further discloses a construction and use method of the double-amplitude bridge transverse energy dissipation damper. According to the transverse energy dissipation damper for the double-amplitude bridge and the construction and use method of the transverse energy dissipation damper, the damper is simple and practical, bridge tower response of the damper in an earthquake can be effectively reduced, collision damage between bridge towers is avoided, certain self-resetting capacity is provided, damage of the earthquake to the double-amplitude bridge is reduced, and resetting of the bridge towers or replacement of damaged components after the earthquake is facilitated.

Description

Technical Field

[0001] The invention relates to the technical field of bridge structure earthquake resistance and shock absorption, and in particular to a double-span bridge transverse energy dissipation damper and a construction and use method thereof. Background Art

[0002] With the development of modern transportation, the width of bridges is getting wider and wider. Many bridges adopt double-span bridge deck design. There are more and more double-span bridges built at home and abroad, mainly in two categories: newly built double-span bridges and building another bridge parallel to the existing bridge to adapt to the increasing traffic volume. However, due to the close distance between the main beams of double-span bridges, and under the action of earthquakes, the main towers are often severely damaged due to mutual collision, and the bridge is greatly affected.

[0003] If the towers of a double-span bridge are laterally consolidated where they are close together, although the problem of collision between the towers can be avoided, the lateral period of the bridge will be significantly shortened due to the formation of a lateral frame structure, which will increase the seismic response of the towers and piers and easily cause damage to the towers. Moreover, the lateral consolidation of the two towers does not have the ability to reset during an earthquake and cannot reduce the damage caused by the earthquake. Summary of the invention

[0004] The purpose of the present invention is to provide a double-span bridge transverse energy dissipation damper and a construction and use method thereof to solve the above defects.

[0005] In order to achieve the above object, the present invention provides the following technical solutions:

[0006] A transverse energy dissipation damper for a double-span bridge comprises a steel plate, a steel-mixed shear force key, a prestressed steel bar, a superelastic shape memory alloy rod, and an anti-buckling steel sleeve. The steel plates are provided in two pieces and are respectively arranged at the transversely close positions of two bridge towers of the double-span bridge. The steel-mixed shear force keys are provided in a plurality and are respectively installed on the outer end surfaces of the two steel plates. The prestressed steel bar penetrates the two steel plates and has its two ends respectively anchored to the two bridge towers. The two ends of the superelastic shape memory alloy rod are respectively fixedly connected to the side end surfaces of the two steel plates. The anti-buckling steel sleeve is sleeved on the superelastic shape memory alloy rod.

[0007] Preferably, at least two superelastic shape memory alloy rods are provided and are respectively installed on both side end surfaces of the steel plate.

[0008] Preferably, the steel plate is provided with a transverse through hole, and the prestressed steel bar is penetrated and arranged in the transverse through hole of the steel plate.

[0009] Preferably, the two steel plates are connected together by a superelastic shape memory alloy rod.

[0010] Preferably, a construction and use method of a double-span bridge transverse energy dissipation damper comprises the following steps:

[0011] S1. According to the design requirements of the relative displacement between the two bridge towers under earthquake action, the number, specifications and positions of steel-concrete shear keys, prestressed steel bars and superelastic shape memory alloy rods are planned and designed to meet the pressure, friction and shear resistance requirements between the two steel plates;

[0012] S2, prefabricate the steel plate 1 and the steel-concrete shear key 2 in the factory, transport them to the bridge installation site and install them in place;

[0013] S3, before pouring the bridge tower concrete, reserve the installation channel of the prestressed steel bar 3, then pour the bridge tower concrete using the two steel plates 1 as templates, and then tension the prestressed steel bar 3;

[0014] S4. After the buckling-proof steel sleeve is sleeved on the superelastic shape memory alloy rod at the side end surfaces of the two steel plates, the two ends of the superelastic shape memory alloy rod are fixedly connected to the side end surfaces of the two steel plates respectively; the installation of multiple superelastic shape memory alloy rods is realized in the same way;

[0015] S5. After the earthquake, the relative displacement between the two bridge towers returns to the initial position by releasing the tension of the prestressed steel bars.

[0016] The beneficial effects of the present invention are:

[0017] The lateral energy-absorbing damper for the double-span bridge of the present invention and the construction and use method thereof are simple and practical, and can effectively reduce the response of the bridge towers of the double-span bridge under earthquakes, avoid collision damage between the bridge towers, and provide a certain self-resetting capability, thereby reducing the damage of earthquakes to the double-span bridges and ensuring the normal use of the bridge towers. Moreover, this arrangement is also convenient for resetting the bridge towers or replacing damaged components after an earthquake. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 : A schematic structural diagram of the double-width bridge transverse energy dissipation damper of the present invention;

[0019] Figure 2 : A schematic diagram of the installation structure of the double-width bridge transverse energy dissipation damper and the bridge tower of the present invention;

[0020] Figure 3 : Exploded view of the installation structure of the lateral energy dissipation damper and the bridge tower of the double-span bridge of the present invention. DETAILED DESCRIPTION

[0021] Combined with Figure 1-3 , the specific implementation mode of the present invention is described as follows:

[0022] like Figure 1 , 2As shown in , 3, a double-span bridge lateral energy dissipation damper includes a steel plate 1, a steel-concrete shear force key 2, a prestressed steel bar 3, a superelastic shape memory alloy rod 4, and an anti-buckling steel sleeve 5.

[0023] There are two steel plates 1 and they are respectively arranged at the positions where two bridge towers of the double-span bridge are close to each other laterally, or they can be arranged between two bridge piers of the double-span bridge.

[0024] Several steel-concrete shear force keys 2 are provided and respectively installed on the outside of the two steel plates 1, and the several steel-concrete shear force keys 2 on the outside of the steel plate 1 are arranged on the outside of the steel plate 1 in an equidistant matrix. The steel-concrete shear force keys 2 can be selected in different forms according to the situation, but it is necessary to ensure that the total shear resistance of the steel-concrete shear force keys 2 is greater than the critical friction force between the steel plates.

[0025] The steel plate 1 is provided with transverse through holes, and the two ends of the prestressed steel bar 3 are respectively penetrated in the transverse through holes of the two steel plates 1 and anchored to the two bridge towers respectively. The transverse through holes have a large aperture, and the prestressed steel bar 3 and the transverse through holes will not generate friction so as to damage or even break the prestressed steel bar 3.

[0026] At least two superelastic shape memory alloy rods 4 are provided and respectively installed on the two side end surfaces of the steel plate 1 , the two ends of the superelastic shape memory alloy rod 4 are respectively fixedly connected to the side end surfaces of the two steel plates 1 , and the anti-buckling steel sleeve 5 is sleeved on the superelastic shape memory alloy rod 4 .

[0027] Among them, bolts are welded on the side end faces of the two steel plates 1, and the connecting segment ear plates set at both ends of the superelastic shape memory alloy rod 4 can be connected with the bolts on the two steel plates 1 respectively, and the two steel plates 1 are connected together through the superelastic shape memory alloy rod 4. In this way, when relative displacement occurs between the bridge towers, the superelastic shape memory alloy rod 4 can control the peak displacement and residual displacement between the two bridge towers due to its superelastic mechanical properties, and add an anti-buckling steel sleeve 5 to the core section of the superelastic shape memory alloy rod 4 to enable it to perform well. After the earthquake, check and release the prestressed steel bars 3, check whether the prestressed steel bars 3 and the superelastic shape memory alloy rod 4 are damaged, and repair or replace them in time if damaged.

[0028] A construction and use method of a double-span bridge transverse energy dissipation damper comprises the following steps:

[0029] S1. According to the design requirements of the relative displacement between the two bridge towers under earthquake action, the quantity, specifications and positions of the steel-concrete shear keys 2, prestressed steel bars 3 and superelastic shape memory alloy rods 4 are planned and designed to meet the pressure, friction and shear resistance requirements between the two steel plates 1.

[0030] S2. The steel plates 1 and steel-concrete shear keys 2 are prefabricated in the factory, transported to the bridge installation site and installed in place. A number of steel-concrete shear keys 2 need to be welded on the side of each steel plate 1 according to the specification requirements to provide sufficient shear force.

[0031] S3. Before pouring the bridge tower concrete, a hole for installing the prestressed steel bar 3 is reserved, and then the bridge tower concrete is poured using the two steel plates 1 as templates, and then the prestressed steel bar 3 is tensioned.

[0032] S4. Before pouring the bridge tower concrete, a mounting hole for the prestressed steel bar 3 is reserved, and a transverse through hole is set on the steel plate 1; then the bridge tower concrete is poured using the two steel plates 1 as a template, and when the bridge tower concrete reaches a certain strength, the two ends of the prestressed steel bar 3 are respectively penetrated and set in the transverse through holes of the two steel plates 1 and the mounting hole of the bridge tower, and then the prestressed steel bar 3 is tensioned and anchored to the two bridge towers, so that the steel plate and the bridge tower body form a unified whole; since the transverse through hole has a large aperture, it can prevent the relative displacement of the two steel plates 1, and the prestressed steel bar 3 and the transverse through hole will not generate friction so as to damage or even break the prestressed steel bar 3.

[0033] S5. At the side end surfaces of the two steel plates 1, the anti-buckling steel sleeve 5 is sleeved on the superelastic shape memory alloy rod 4, and then the two ends of the superelastic shape memory alloy rod 4 are fixedly connected to the side end surfaces of the two steel plates 1 respectively. The superelastic shape memory alloy rod 4 has good self-resetting performance, and the anti-buckling steel sleeve 5 is installed on the outside of its core section to prevent the superelastic shape memory alloy rod 4 from buckling; similarly, the installation of all superelastic shape memory alloy rods 4 is achieved.

[0034] S6. Under the action of a transverse earthquake, the steel plates 1 will dissipate energy through mutual friction. The prestressing force applied by the prestressed steel bars 3 passing through the bridge towers and the steel plates 1 increases the friction between the steel plates 1 and thus increases the energy dissipation capacity of the damper, thereby playing the role of a transverse energy dissipation damper. The superelastic shape memory alloy rod 4 can control the peak displacement and residual displacement between the bridge towers. After the earthquake, the relative displacement between the two bridge towers is returned to the initial position by releasing the tension of the prestressed steel bars 3, thereby realizing the use and construction of the transverse energy dissipation damper of the double-span bridge.

[0035] The lateral energy-absorbing damper for the double-span bridge of the present invention and the construction and use method thereof are simple and practical. For the bridge towers of the double-span bridge, the damper can effectively reduce the bridge tower response under earthquakes, avoid collision damage between the bridge towers, and provide a certain self-resetting capability, thereby reducing the damage of earthquakes to the double-span bridge and ensuring the normal use of the bridge towers. Moreover, this arrangement is also convenient for post-earthquake resetting or replacement of damaged components.

[0036] The above is an exemplary description of the invention in conjunction with the accompanying drawings. It is obvious that the specific implementation of the present invention is not limited to the above-mentioned method. As long as such non-substantial improvements are made by adopting the method concept and technical solution of the present invention, or the concept and technical solution of the invention are directly applied to other occasions without improvement, they are all within the protection scope of the present invention.

Claims

1. A double-bridge transverse energy dissipation damper, characterized in that: The invention comprises a steel plate (1), a steel-mixed shear force key (2), a prestressed steel bar (3), a superelastic shape memory alloy rod (4), and an anti-buckling steel sleeve (5). The steel plate (1) is provided with two pieces and is respectively provided at the transversely close positions of two bridge towers of a double-span bridge. The steel-mixed shear force keys (2) are provided with a plurality of pieces and are respectively installed on the outer end surfaces of the two steel plates (1). The two ends of the prestressed steel bar (3) respectively penetrate the two steel plates (1) and are respectively anchored to the two bridge towers. The two ends of the superelastic shape memory alloy rod (4) are respectively fixedly connected to the side end surfaces of the two steel plates (1). The anti-buckling steel sleeve (5) is sleeved on the superelastic shape memory alloy rod (4).

2. A double-bridge transverse energy dissipation damper according to claim 1, characterized in that: At least two superelastic shape memory alloy rods (4) are provided and are respectively installed on both side end surfaces of the steel plate (1).

3. The double-bridge transverse energy dissipation damper according to claim 1, characterized in that: The steel plate (1) is provided with a transverse through hole, and the prestressed steel bar (3) is arranged through the transverse through hole of the steel plate (1).

4. The double-bridge transverse energy dissipation damper according to claim 1, characterized in that: The plurality of steel mixed shear force keys (2) on the outside of the steel plate (1) are arranged on the outer end surface of the steel plate (1) in an equidistant matrix.

5. The double-bridge transverse energy dissipation damper according to claim 1, characterized in that: The two steel plates (1) are connected together via a superelastic shape memory alloy rod (4).

6. A construction and use method of a double-span bridge transverse energy dissipation damper, based on the double-span bridge transverse energy dissipation damper according to any one of claims 1 to 5, characterized in that: The steps include: S1. According to the design requirements of the relative displacement between the two bridge towers under earthquake action, the number, specifications and positions of the steel-concrete shear keys (2), prestressed steel bars (3) and superelastic shape memory alloy rods (4) are planned and designed to meet the pressure, friction and shear resistance requirements between the two steel plates (1); S2. Prefabricate the steel plate (1) and the steel-concrete shear key (2) in advance in the factory, transport them to the bridge installation site and install them in place; S3, before pouring the bridge tower concrete, a hole for installing the prestressed steel bar (3) is reserved, and then the bridge tower concrete is poured using the two steel plates (1) as a template, and then the prestressed steel bar 3 is tensioned; S4. After the buckling-proof steel sleeve (5) is sleeved on the superelastic shape memory alloy rod (4) at the side end surfaces of the two steel plates (1), the two ends of the superelastic shape memory alloy rod (4) are fixedly connected to the side end surfaces of the two steel plates (1) respectively; the installation of multiple superelastic shape memory alloy rods (4) is realized in the same way; S5. After the earthquake, the relative displacement between the two bridge towers is returned to the initial position by releasing the tension of the prestressed steel bars (3), thereby realizing the use and construction of the transverse energy-absorbing damper of the double-span bridge.

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