A combined pad stone structure and design method for damper installation

Abstract

The present application relates to a combined cushion stone structure and design method for installing a damper, comprising a cushion stone concrete and a steel frame, wherein one side of the cushion stone concrete is near the center of the pier, and the other side is near the edge of the pier, and a damper installation area is formed on the top surface of the cushion stone concrete near the edge of the pier; the steel frame comprises a frame body, an anchor bolt connector and a pier connector, wherein the frame body is arranged inside the cushion stone concrete; the anchor bolt connector is fixed to the steel frame, and the top of the anchor bolt connector passes through the damper installation area and forms an anchor bolt reserved hole; the pier connector is fixed to the bottom of the steel frame, and its bottom extends out of the bottom of the cushion stone concrete. When in use, it can be set at the edge of the pier beyond the pier top range and can also resist the horizontal force generated by the large-tonnage damper, so that the pin base on the steel truss bridge damper beam can be set at the lower chord node just above the center of the pier or main tower beam, reducing the structural length of the damper, enhancing its stability, and saving engineering costs.

Description

Technical Field

[0001] The present application relates to the technical field of bridges, and in particular to a combined pad stone structure and design method for damper installation. Background Art

[0002] In large-span bridges, dampers are often required to limit the longitudinal displacement of the main beam under the action of earthquakes, wind loads, traction and braking forces. The main beams of double-deck bridges built jointly by road and rail are often made of steel trusses. In order to ensure the rationality of the force on the truss, the damper pin base is often set at the lower chord node of the steel truss; the steel truss internode is large, and the pin bases at both ends of the damper are respectively set on the top surface of the pier or main tower beam and the lower chord node of the main beam internode adjacent to the pier center, which will cause the damper piston rod axis to be too long, affecting the stability of the damper and causing engineering waste; when the pin base is set at the lower chord node of the main beam just above the center of the pier or main tower beam, in order to meet the structural requirements of the damper, the pin base on the other side often needs to be set at the edge of the pier or main tower beam and beyond the top surface of the pier or main tower beam. The traditional concrete damper pad stone cannot meet the force requirements and is difficult to repair after damage. Summary of the Invention

[0003] The embodiment of the present application provides a combined pad stone structure and design method for installing a damper. When in use, it can be set at the edge of a pier beyond the pier top range and can also resist the horizontal force generated by a large-tonnage damper, so that the pin shaft base on the damper beam of a steel truss bridge can be set at the lower chord node just above the center of the pier or main tower beam, reducing the structural length of the damper, enhancing its stability, and saving engineering costs.

[0004] In a first aspect, a combined pad stone structure for installing a damper is provided, comprising:

[0005] The bolster concrete has one side surface close to the center of the pier and the other side surface close to the edge of the pier, and a damper installation area is formed on the top surface of the bolster concrete close to the edge of the pier;

[0006] The steel skeleton comprises a skeleton body, an anchor connector and a pier connector, wherein the skeleton body is arranged inside the pad stone concrete; the anchor connector is fixed to the steel skeleton, the top of the anchor connector passes through the damper installation area and is formed with an anchor hole; the pier connector is fixed to the bottom of the steel skeleton, and its bottom extends out of the bottom of the pad stone concrete.

[0007] In some embodiments, the skeleton body includes a steel skeleton top plate, a steel skeleton bottom plate, and a steel skeleton web plate, and the top and bottom of the steel skeleton web plate are respectively fixed to the steel skeleton top plate and the steel skeleton bottom plate;

[0008] The pier connector is fixed to the bottom of the steel frame base plate;

[0009] The anchor bolt connector is fixed to the steel frame web, and the top of the anchor bolt connector passes through the damper installation area.

[0010] In some embodiments, through holes are provided on the web of the steel skeleton.

[0011] In some embodiments, a reinforcement member is further provided in the pad stone concrete, and the reinforcement member is passed through the through hole.

[0012] In some embodiments, the pier connector includes a perforated plate having a through hole formed therein for the reinforcement member to pass through.

[0013] In some embodiments, the pier connector includes welding nails, and a plurality of the welding nails are arranged from the side close to the center of the pier to the side close to the edge of the pier.

[0014] In some embodiments, the pier connector further includes a perforated plate, wherein the perforated plate is provided with a through hole for the reinforcement member to pass through.

[0015] In some embodiments, the through hole is provided between two adjacent welding pins.

[0016] In some embodiments, pad stone steel bars are provided in the pad stone concrete.

[0017] In a second aspect, a design method for a combined pad stone structure for installing a damper as described above is provided, comprising:

[0018] Based on the overall layout of the bridge, the damper structure, and the thickness d of the concrete covering the steel frame, determine the height H and width B of the composite pad structure, the cantilever length L1 of the steel frame, the cross-sectional layout dimensions of the steel frame, and the location and diameter of the anchor bolt holes;

[0019] Determine the spacing of the weld nails and the hole spacing of the perforated plate according to the structural requirements, and calculate the shear stiffness k of the weld nail per unit length in the longitudinal bridge direction according to the tonnage N corresponding to the damper and the requirements of the specification. s and the shear stiffness k of the perforated plate p , calculate the shear force borne by the opening plate and the shear force borne by the welding nails respectively;

[0020] Shear force borne by the perforated plate: N p =N·k p / (k p +k s );

[0021] Shear force borne by the welding nail: N s = N·k s / (k p +k s );

[0022] According to the shear force N borne by the welding nail s , Shear force borne by the perforated plate N p , Design value of bearing capacity of weld nail per unit length in longitudinal bridge direction V s and the design value of the bearing capacity of the perforated plate V p , determine the longitudinal length of the pier connector L2=max{N p / V p ,N s / V s};

[0023] Based on the cantilever length L1 of the steel skeleton, the longitudinal length L2 of the pier connector in the bridge direction, and the thickness d of the concrete covering the steel skeleton, the longitudinal length L of the composite pad stone structure in the bridge direction is determined as L=L1+L2+2d.

[0024] The beneficial effects of the technical solution provided by this application include:

[0025] The combined pad stone structure provided in the embodiment of the present application has a simple structural design, a clear principle, a high connection strength with the bridge pier, good integrity, and a large overall shear strength, and can withstand large horizontal forces. It is suitable for large-tonnage damper pad stones located at the edge of the bridge pier and need to be set beyond the pier top range where the pier top space is limited.

[0026] Through this application, the pin base on the bridge damper beam whose main beam is a steel truss beam can be set at the lower chord node just above the center of the pier or main tower beam, reducing the structural length of the damper, enhancing its stability, and saving construction costs.

[0027] In the combined pad stone structure, anchor bolt pre-holes are provided in the steel frame to avoid the need for setting up a separate anchor bolt pre-hole template when pouring the pad stone, and to ensure the precise positioning of the anchor bolt pre-holes and the integrity of the connection between the pin shaft base and the pad stone, so that the horizontal force of the damper can be transmitted to the entire pad stone, ensuring that the pad stone as a whole resists the horizontal force of the damper.

[0028] The combined pad stone structure uses pad stone concrete to wrap the steel frame, which has good durability and does not require special maintenance work such as painting on the steel frame during the operation phase. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0030] Figure 1 A three-dimensional schematic diagram of a combined pad stone structure for installing a damper provided in an embodiment of the present application;

[0031] Figure 2 A cross-sectional view of a combined pad stone structure for installing a damper provided in an embodiment of the present application;

[0032] Figure 3 for Figure 2 Middle AA view;

[0033] Figure 4 for Figure 2 Middle BB view;

[0034] Figure 5 for Figure 2 Center CC view.

[0035] In the figure: 1. Pad stone concrete; 2. Steel frame top plate; 3. Steel frame bottom plate; 4. Steel frame web; 5. Anchor bolt reserved hole; 6. Welding nail; 7. Perforated plate; 8. Through hole; 9. Pier; 10. Damper; 11. Pin base. DETAILED DESCRIPTION

[0036] To make the purpose, technical solutions, and advantages of the embodiments of this application more clear, the technical solutions in the embodiments of this application will be clearly and completely described below in conjunction with the drawings in the embodiments of this application. Obviously, the described embodiments are part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0037] See also Figure 1 、 Figure 2 、 Figure 3 、 Figure 4 and Figure 5 As shown, an embodiment of the present application provides a combined pad stone structure for installing a damper, which includes a pad stone concrete 1 and a steel skeleton.

[0038] One side of the pad stone concrete 1 along the longitudinal direction of the bridge is near the center of the pier (marked as Z in the figure), and the other side is near the edge of the pier (marked as Y in the figure). A damper installation area is formed on the top surface of the pad stone concrete 1 near the edge of the pier, which reserves a position for subsequent damper installation.

[0039] The steel skeleton includes a skeleton body, an anchor connector and a pier connector. The skeleton body is arranged inside the pad stone concrete 1; the anchor connector is fixed to the steel skeleton, and the top of the anchor connector passes through the damper installation area and is formed with an anchor hole 5. The anchor hole 5 is provided on the steel skeleton at the sleeve bolt corresponding to the pin base 11 to ensure that the horizontal force of the damper can be transmitted to the entire pad stone, and the pad stone as a whole resists the horizontal force of the damper; the pier connector is fixed to the bottom of the steel skeleton, and its bottom extends out of the bottom of the pad stone concrete 1.

[0040] The composite pad stone structure of the present application adopts a steel-concrete composite structure, in which pad stone concrete is wrapped around a steel skeleton to form a steel-concrete composite structure. This structure not only ensures the durability of the pad stone, but also improves the integrity of the composite pad stone structure. The length of the pad stone can be extended toward the center of the pier to improve the overall shear bearing capacity of the pad stone and the connection strength between the pad stone and the pier.

[0041] A pier connector is provided at the bottom of the combined pad stone structure of the present application, which can connect the combined pad stone structure and the pier into one, thereby ensuring the reliability of the connection between the pad stone and the pier under the horizontal force of the damper.

[0042] In the combined pad stone structure, the steel frame is provided with anchor bolt reserved holes 5, which avoids the need to set up a separate anchor bolt reserved hole template when pouring the pad stone, and ensures the precise positioning of the anchor bolt reserved holes and the integrity of the connection between the pin shaft base and the pad stone, so that the horizontal force of the damper can be transmitted to the entire pad stone, ensuring that the pad stone as a whole resists the horizontal force of the damper.

[0043] It can be seen that the combined pad stone structure provided in the embodiment of the present application has a simple structural design, a clear principle, a high connection strength with the bridge pier, good integrity, and a large overall shear strength, and can withstand large horizontal forces. It is suitable for large-tonnage damper pad stones located at the edge of the pier and need to be set beyond the pier top range where the pier top space is limited.

[0044] Through this application, the pin base on the bridge damper beam whose main beam is a steel truss beam can be set at the lower chord node just above the center of the pier or main tower beam, reducing the structural length of the damper, enhancing its stability, and saving construction costs.

[0045] The combined pad stone structure uses pad stone concrete to wrap the steel frame, which has good durability and does not require special maintenance work such as painting on the steel frame during the operation phase.

[0046] It is understood that the pad stone concrete 1 is provided with pad stone steel bars. Before pouring, the pad stone steel bars are used to build a framework, and then the concrete is poured. On the one hand, the pad stone steel bars can effectively improve the compressive bearing capacity of the pad stone concrete, especially in key areas such as the tops of piers of bridges and large buildings, to avoid local stress concentration that may cause concrete crushing. On the other hand, when subjected to load, the pad stone steel bars work together with the concrete, with the steel bars bearing tensile stress and the concrete resisting compressive stress, forming a rigid and flexible force system to ensure the overall stability of the structure.

[0047] Further, see Figure 1 As shown, the main frame consists of a steel frame top plate 2, a steel frame bottom plate 3, and a steel frame web 4. The pier connectors are fixed to the bottom of the steel frame bottom plate 3, and the anchor connectors are fixed to the steel frame web 4, with their tops extending beyond the damper mounting area. The top and bottom of the steel frame web 4 are fixed to the steel frame top plate 2 and steel frame bottom plate 3, respectively, giving the main frame an I-shaped structure. This allows for direct use of I-beams, eliminating the need for welding and allowing for local materials. Alternatively, the main frame can be formed by directly welding three steel plates, which significantly reduces the workload. Because the flanges (top and bottom plates) of the steel frame primarily bear tensile and compressive stresses during bending, while the web bears shear stresses, a natural bending-resistant frame is formed. After being encased in concrete, the concrete constrains the lateral deformation of the steel frame. The synergistic effect of these two factors significantly increases the cross-sectional moment of inertia and flexural stiffness. Furthermore, the shear resistance of the steel frame web, combined with the shear stiffness of the concrete, reduces the risk of shear failure.

[0048] In fact, in one solution, two sets of split I-shaped skeleton bodies can be set up and arranged along the transverse direction of the bridge, while in another solution, see Figure 3 、 Figure 4 and Figure 5 As shown, two sets of I-shaped frame bodies are integrally formed, that is, the frame body has two steel frame webs 4 , and the two steel frame webs 4 share a steel frame top plate 2 and a steel frame bottom plate 3 .

[0049] It is understandable that, according to actual needs, more than two sets of split I-shaped skeleton bodies can be provided, or more than two steel skeleton webs 4 can be provided in an integrally formed skeleton body.

[0050] Further, see Figure 1As shown, the steel web 4 is provided with through-holes 8. During concrete pouring, the concrete passes through these holes, ensuring the continuity of the pad concrete 1. The benefit of providing through-holes 8 is that, after the concrete passes through these holes, it forms "concrete pins" on both sides of the steel web, tightly engaging the web with the concrete on both sides like a mortise and tenon joint. This mechanical embedding significantly enhances the bond strength at the steel-concrete interface, effectively preventing interfacial slip and ensuring coordinated force between the two.

[0051] Furthermore, a reinforcement is also provided in the pad stone concrete 1, and the reinforcement is passed through the through hole 8. The reinforcement can use reinforcing steel bars, or directly use the pad stone steel bars. Steel bars are set in the through hole 8 to further ensure the connection strength between the steel skeleton and the pad stone concrete 1.

[0052] There are multiple options for the specific structure of the pier connector.

[0053] For example, only the perforated plate 7 is used. Figure 1 and Figure 2 As shown, the pier connector includes a perforated plate 7, which is provided with a through hole 8 for the reinforcement member to pass through. It is understandable that the number of perforated plates 7 can be set accordingly according to the number of the steel skeleton webs 4.

[0054] The reinforcements can be made of reinforced steel bars or directly utilize the steel bars inside the piers. The perforated plate 7 is provided with through holes, and steel bars are arranged in the through holes, similar to the steel skeleton webs, to ensure the continuity of the piers and the integrity of the connection between the piers and the concrete pad 1.

[0055] For example, only welding nail 6 is used. Figure 1 and Figure 2 As shown, the pier connector includes welding nails 6, and a plurality of welding nails 6 are arranged from the center side of the pier to the edge side of the pier, such as a row of multiple nails, or multiple rows of multiple nails.

[0056] For example, as an example, the perforated plate 7 and the welding nail 6 are used at the same time. Figure 1 and Figure 2 shown.

[0057] It can be understood that, compared with using only the perforated plate 7 or only the welding nails 6, using both the perforated plate 7 and the welding nails 6 can achieve better results.

[0058] See also Figure 2 As shown, the through hole 8 is provided between two adjacent welding nails 6 . The advantage of adopting this solution is that the steel bar passing through the through hole 8 can be further wrapped around the welding nail 6 .

[0059] The "rebar-stud-concrete" composite anchoring system formed by wrapping rebar around studs significantly strengthens the interface between the perforated plate 7 and the concrete. The wrapped rebar acts as an additional "pin," sharing the shear forces at the interface with the studs. This significantly improves shear resistance compared to stud-only force transmission. This design effectively prevents relative slip between the perforated plate 7 and the concrete, ensuring a coordinated load-bearing relationship between the two.

[0060] Furthermore, the rebar wraps around the studs and passes through the through-holes, connecting the scattered studs into a cohesive network. This creates a three-dimensional load-bearing system among the concrete, rebar, and steel skeleton. When the structure is subjected to eccentric loads or vibration, this network quickly transfers stress, reducing local stress concentrations and improving the overall rigidity and stability of the structure.

[0061] Furthermore, an embodiment of the present application also provides a construction method of a combined pad stone structure for installing a damper, which comprises the following steps:

[0062] S1: Design of combined pad stone structure.

[0063] The specific steps include:

[0064] S11: Based on the overall layout of the bridge, the damper structure, and the thickness d of the concrete covering the steel frame, determine the height H and width B of the composite pad structure, the cantilever length L1 of the steel frame, the cross-sectional layout dimensions of the steel frame, and the location and diameter of the anchor bolt holes.

[0065] S12: Determine the spacing of the welding nails 6 and the hole spacing of the perforated plate 7 according to the structural requirements, and calculate the shear stiffness k of the welding nails 6 per unit length in the longitudinal bridge direction according to the tonnage N corresponding to the damper and the relevant specifications. s and the shear stiffness k of the perforated plate 7 p , calculate the shear force borne by the perforated plate 7 and the shear force borne by the welding nail 6 respectively.

[0066] Shear force borne by the perforated plate: N p =N·k p / (k p +k s )

[0067] Shear force borne by the welding nail: N s = N·k s / (k p +k s )

[0068] S13: According to the shear force N borne by the welding nail 6 s , Shear force N borne by the perforated plate 7 p , Design value of bearing capacity of weld nail 6 per unit length in longitudinal bridge direction V s and the design value of the bearing capacity of the perforated plate 7 V p, determine the longitudinal length of the pier connector L2=max{N p / V p ,N s / V s}, where max{N p / V p ,N s / V s To obtain N p / V p With N s / V s The maximum value in .

[0069] S14: Determine the longitudinal length of the composite pad stone structure in the bridge direction L=L1+L2+2d based on the cantilever length L1 of the steel skeleton, the longitudinal length L2 of the pier connector, and the thickness d of the concrete covering the steel skeleton.

[0070] S2: When the bridge pier 9 is constructed to the pier top, the steel frame is installed and accurately positioned, and is firmly connected to the bridge pier through the pier connector of the steel frame. Reinforced steel bars are inserted into the perforated plate 7 and the pad stone steel bars of the pad stone concrete 1 are pre-embedded;

[0071] S3: pouring concrete on the pier top;

[0072] S4: After the pier top concrete reaches its designed strength, the formwork is erected and the pad stone reinforcement is tied, and the pad stone concrete 1 is poured. During the pouring process, it should be ensured that no concrete flows into the anchor bolt reserved hole 5;

[0073] S5: After the cushion stone concrete 1 reaches its designed strength, the pin base plate is roughened and debris is removed from the surface of the cushion stone concrete 1 and the anchor bolt reserved hole 5.

[0074] S6: Hoist the pin base 11 to be installed on the pad stone into place so that the pin base pad is 1 to 2 cm higher than the surface of the pad stone concrete 1. After precise positioning, cast cement mortar on the surface of the combined pad stone structure to be flush with the pin base pad, and grout the anchor bolt reserved hole 5; after the cement mortar reaches a certain strength, install the damper.

[0075] The present application enhances the shear bearing capacity of the cushion stone by providing a steel skeleton inside the cushion stone, provides through holes on the web plate 4 of the steel skeleton, and inserts steel bars into the through holes to enhance the integrity of the cushion stone; it is connected to the bridge pier 9 by means of welded nails 6 and perforated plates 7, which can resist the large tonnage horizontal force generated by the damper 10; the steel skeleton is provided with anchor bolt reserved holes 5, which avoids the need to set up a separate anchor bolt reserved hole template when pouring the cushion stone, and ensures the precise positioning of the anchor bolt reserved holes and the integrity of the connection between the pin base and the cushion stone, so that the horizontal force of the damper 10 can be transmitted to the entire cushion stone; the design and manufacturing are convenient, the principle is simple, and the construction is convenient. It has obvious advantages for large-tonnage damper cushion stones with limited space on the pier top and the cushion stone located at the edge of the pier and beyond the pier top range. The pin base on the damper beam of a bridge with a steel truss main beam can be set at the lower chord node just above the center of the pier or main tower beam, reducing the structural length of the damper 10, enhancing stability, and saving engineering costs.

[0076] In the description of this application, it should be noted that the terms "upper" and "lower" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on this application. Unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be internal communication between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to the specific circumstances.

[0077] It should be noted that, in this application, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, an element defined by the sentence "comprising a ..." does not exclude the presence of other identical elements in the process, method, article or device comprising the element.

[0078] The foregoing is merely a list of specific embodiments of the present application, intended to enable those skilled in the art to understand or implement the present application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application is not limited to the embodiments shown herein, but is intended to conform to the broadest scope consistent with the principles and novel features of the present application.

Claims

1. A combined pad stone structure for installing a damper, characterized in that: It includes: The bolster concrete (1) has one side surface close to the center of the pier and the other side surface close to the edge of the pier, and a damper installation area is formed on the top surface of the bolster concrete (1) close to the edge of the pier; A steel frame, comprising a frame body, an anchor bolt connector, and a pier connector for connecting the combined pad stone structure and the pier into one piece, wherein the frame body is arranged inside the pad stone concrete (1), and one end of the frame body close to the edge of the pier is used to extend out of the edge of the pier to form a steel frame cantilever; the anchor bolt connector is fixed to the steel frame, and at least part of the anchor bolt connector is located on the steel frame cantilever, and the top of the anchor bolt connector passes through the damper installation area and is formed with an anchor bolt reserved hole (5); the pier connector is fixed to the bottom of the steel frame, and its bottom extends out of the bottom of the pad stone concrete (1).

2. The combined pad structure for installing a damper according to claim 1, wherein: The skeleton body comprises a steel skeleton top plate (2), a steel skeleton bottom plate (3) and a steel skeleton web plate (4), wherein the top and bottom of the steel skeleton web plate (4) are respectively fixed to the steel skeleton top plate (2) and the steel skeleton bottom plate (3); The pier connector is fixed to the bottom of the steel frame bottom plate (3); The anchor bolt connector is fixed to the steel skeleton web (4), and the top portion thereof passes through the damper installation area.

3. The combined pad stone structure for installing a damper according to claim 2, wherein: The steel skeleton web (4) is provided with a through hole (8).

4. The combined pad stone structure for installing a damper according to claim 3, wherein: A reinforcement member is also provided in the pad stone concrete (1), and the reinforcement member is passed through the through hole (8).

5. The combined pad stone structure for installing a damper according to claim 1, wherein: The pier connector comprises a perforated plate (7), and the perforated plate (7) is provided with a through hole (8) for the reinforcement member to pass through.

6. The combined pad stone structure for installing a damper according to claim 1, wherein: The pier connection piece comprises welding nails (6), and a plurality of the welding nails (6) are arranged from the side close to the center of the pier to the side close to the edge of the pier.

7. The combined pad stone structure for installing a damper according to claim 6, wherein: The pier connector also includes a perforated plate (7), and the perforated plate (7) is provided with a through hole (8) for the reinforcement member to pass through.

8. The combined pad stone structure for installing a damper according to claim 7, wherein: The through hole (8) is provided between two adjacent welding nails (6).

9. The combined pad stone structure for installing a damper according to claim 1, wherein: Pad stone steel bars are provided in the pad stone concrete (1).

10. A design method for a combined pad stone structure for installing a damper according to claim 7, characterized in that: It includes: Based on the overall layout of the bridge, the damper structure, and the thickness d of the concrete covering the steel frame, determine the height H and width B of the composite pad structure, the cantilever length L1 of the steel frame, the cross-sectional layout dimensions of the steel frame, and the location and diameter of the anchor bolt holes; The spacing of the welding nails (6) and the hole spacing of the perforated plate (7) are determined according to the structural requirements, and the shear stiffness k of the welding nails (6) per unit length in the longitudinal bridge direction is calculated according to the tonnage N corresponding to the damper and the requirements of the specification. s and the shear stiffness k of the perforated plate (7) p , calculate the shear force borne by the perforated plate (7) and the shear force borne by the welding nail (6) respectively; Shear force borne by the perforated plate (7): N p =N·k p / (k p +k s ); Shear force borne by the welding nail (6): N s = N·k s / (k p +k s ); According to the shear force N borne by the welding nail (6) s , Shear force N borne by the perforated plate (7) p , Design value of bearing capacity of weld nail (6) per unit length in longitudinal direction V s and the design value of the bearing capacity of the perforated plate (7) V p , determine the longitudinal length of the pier connector L2=max{N p / V p ,N s / V s }; Based on the cantilever length L1 of the steel skeleton, the longitudinal length L2 of the pier connector in the bridge direction, and the thickness d of the concrete covering the steel skeleton, the longitudinal length L of the composite pad stone structure in the bridge direction is determined as L=L1+L2+2d.

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