CN216999257U

CN216999257U - Prefabricated pier structure with external energy dissipators

Info

Publication number: CN216999257U
Application number: CN202220374417.4U
Authority: CN
Inventors: 杨光煜; 陈斌; 谢亮; 李春磊; 刘绍卿; 于沉香; 尤涵锐; 吴琪
Original assignee: Wuhan Surveying Geotechnical Research Institute Co Ltd of MCC
Current assignee: Wuhan Surveying Geotechnical Research Institute Co Ltd of MCC
Priority date: 2022-02-23
Filing date: 2022-02-23
Publication date: 2022-07-19
Anticipated expiration: 2032-02-23

Abstract

The utility model provides a prefabricated pier structure with an external energy dissipater. The pier structure comprises a pier main body, a bearing platform, built-in stainless steel bars and an external soft steel energy dissipater, wherein the pier main body comprises an upper reinforced concrete section and an ECC material reinforced section, the lower part of the ECC material reinforced section is meshed with the bearing platform, the ECC material reinforced section and the reinforced concrete section are connected into a whole through BFRP ribs and are connected with the bearing platform through the BFRP ribs, and the built-in stainless steel bars are arranged at the connecting part of the ECC material reinforced section and the bearing platform; external mild steel energy dissipator is along horizontal bridge to symmetrical arrangement in pier main part both sides, and every group mild steel energy dissipator includes low yield point mild steel, from reset spring, steel sheet shell and connector, corresponds at pier main part side and cushion cap upper portion and is equipped with the otic placode, the mild steel energy dissipator passes through the connector at both ends and is connected with the otic placode that corresponds. The pier structure provides restoring force through the self-resetting structure and also has two energy consumption devices for consuming earthquake energy.

Description

Take prefabricated pier structure of external energy consumer

Technical Field

The utility model relates to the field of bridge engineering, in particular to a prefabricated pier structure with an external energy dissipater.

Background

China is located between two earthquake zones in the world, namely the Pacific earthquake zone and the Eurasian earthquake zone, and earthquake fracture zones are very active under the extrusion and collision of Pacific plates, Indian plates and Philippine sea plates. The earthquake activity frequency is high, the intensity is high, the earthquake focus is shallow, the distribution is wide, and the earthquake disaster is a serious country in China. Therefore, most bridges in China are in very severe environments, and durability damage caused by corrosion of external aggressive media inevitably occurs in the service period, so that the seismic performance of the bridges is greatly degraded. As a junction of urban traffic engineering, the bridge plays an important role in emergency rescue and personnel escape. The bridge pier is used as a main lateral force resisting and supporting component of the bridge and is of great importance to the stability and safety of the whole bridge structure. A large number of earthquake damage investigation results show that under the action of high axial pressure ratio and earthquake, longitudinal rib buckling and concrete crushing stripping phenomena can occur in a plastic hinge area at the bottom of a reinforced concrete bridge pier, so that a bridge structure is damaged or collapsed and is difficult to repair, and the development of emergency rescue work is influenced. In view of this, in recent years, scholars at home and abroad propose and develop novel earthquake-resistant structures and systems based on a design concept of recoverable functions, and the recoverable structure system consists of assembled components, so that the construction is rapid and convenient, and the repairability after the earthquake is high. But compared with the conventional cast-in-place pier, the residual displacement of the self-reset pier after the earthquake is obviously reduced, and the self-reset pier has good self-reset capability, but the energy consumption capability of the self-reset pier is poorer. Therefore, the earthquake-resistant performance of the energy-consuming member can be greatly improved by adding the energy-consuming member and adopting a high-performance material.

The ECC is a cement-based composite material which takes cement, cement filler or fine aggregate with the grain diameter not more than 5mm as a matrix and takes fiber as a reinforcing material. Compared with common concrete, the ECC can disperse the stress of a material cracking area to a surrounding non-cracking area due to the bridging effect of internal fibers, so that the stress level of the material crack is effectively reduced, and the ECC shows the characteristics of strain hardening and multi-crack cracking under the tensile effect. Therefore, the ECC material can dissipate seismic energy through large deformation, multi-slit cracking and strain hardening, and has good seismic performance and powerful energy consumption capability.

The BFRP is a fiber material formed by soaking basalt fiber roving in resin and then drawing and extruding the basalt fiber roving through a special thermoforming mould under a certain traction force. Compared with the traditional engineering materials (steel, concrete, wood and the like), the BFRP has the characteristics of light weight, high strength, good durability, excellent fatigue resistance, excellent designability and the like, and the excellent mechanical property of the BFRP enables the BFRP to show great advantages in a prestressed structure. In addition, the basalt ore in China is rich in resources and wide in material availability, and provides a raw material guarantee for large-scale production of basalt fibers. Therefore, the basalt fiber has wide development prospect in China.

Disclosure of Invention

In order to solve the problem that the seismic performance and the durability of the prefabricated bridge pier are insufficient, the utility model provides a prefabricated bridge pier structure with an external energy dissipater, wherein the bridge pier structure has the energy dissipation function of both an internal energy dissipation component and an external energy dissipation component, and the seismic performance of the bridge pier structure can be greatly improved; and high-performance materials ECC and BFRP are introduced, so that the corrosion of external corrosive media to the pier structure can be effectively prevented, and the durability and the safety of the pier structure in a corrosive environment are greatly improved.

In order to achieve the technical purpose, the utility model provides a prefabricated pier structure with an external energy dissipater, which is characterized in that: the pier structure comprises a pier main body, a bearing platform, built-in stainless steel bars and an external soft steel energy dissipater, wherein the pier main body comprises a reinforced concrete section at the upper part and an ECC material reinforcing section at the lower part, which is meshed with the bearing platform, the ECC material reinforcing section and the reinforced concrete section are connected into a whole through BFRP ribs and are connected with the bearing platform through the BFRP ribs, the lower ends of the BFRP ribs are anchored in the bearing platform through steel plate anchoring structures, the upper ends of the BFRP ribs are anchored on the top surface of the reinforced concrete section through anchorage devices, and the built-in stainless steel bars are arranged at the connecting part of the ECC material reinforcing section and the bearing platform; the external soft steel energy dissipater comprises two groups of soft steel energy dissipaters which are symmetrically arranged at two sides of the pier main body along the transverse bridge direction at an angle of 30-60 degrees with the bearing platform, each group of soft steel energy dissipater comprises low-yield-point soft steel, self-resetting springs, a steel plate shell and connectors, the low-yield-point soft steel is positioned in the middle of the steel plate shell, the self-resetting springs are symmetrically distributed at two sides of the low-yield-point soft steel, and the connectors are respectively arranged at two ends of the steel plate shell; the side surface of the pier main body and the upper part of the bearing platform are correspondingly provided with lug plates, and connectors at two ends of the soft steel energy dissipater are respectively connected with the corresponding lug plates through high-strength bolts.

The utility model has the following excellent technical scheme: the ECC material reinforcing section and the reinforced concrete section are prefabricated in a factory and are connected through BFRP ribs, the ECC material reinforcing section and the bearing platform are connected through a concave-convex structure, and the size of the cross section of the concave-convex structure can be determined according to actual conditions.

The utility model has the following excellent technical scheme: the bridge pier main body is connected with the bearing platform through 4 BFRP ribs, each BFRP rib is arranged at the center of a bridge pier column at intervals, each BFRP rib runs through the whole bridge pier main body in a straight and bending-free mode, one end of each BFRP rib is anchored in the bearing platform through a steel plate anchoring structure, and the other end of each BFRP rib is anchored on the top surface of the bridge pier main body through a clamping piece type anchorage device.

The utility model has the following excellent technical scheme: the steel plate anchoring structure comprises a central steel pipe and 2-4 circular steel plates welded on the steel pipe, and the lower end of the BFRP rib penetrates through the central steel pipe to be fixedly connected with the circular steel plate at the bottom.

The utility model has the advantages that: the upper end of each built-in stainless steel bar is arranged on the ECC material reinforcing section, the distance between each built-in stainless steel bar and the outer surface of the pier is 40-80 mm, and the lower end of each built-in stainless steel bar is arranged in the deep part of the bearing platform by 200-500 mm; and the lower end of each built-in stainless steel bar is bent into an angle of 90 degrees, and the bending length is 500-1000 mm.

The utility model has the following excellent technical scheme: two connectors are symmetrically arranged at two ends of the steel plate shell respectively, two lug plates are symmetrically arranged at two sides of the ECC material reinforcing section respectively, and two lug plates are arranged on bearing platforms at two sides of the pier main body respectively.

The prefabricated pier structure is characterized in that an upper pier main body and a lower bearing platform structure of the prefabricated pier structure are connected through BFRP ribs, and two energy dissipation devices are arranged to dissipate seismic energy. In the earthquake process, the pier column and the bearing platform are separated, the structure returns to the original form through the self-weight of the structure and the self-resetting member, the pier enters a swinging motion state, external vibration is isolated, damage is reduced, and the pier structure can provide restoring force through the self-resetting member without the help of external force, so that the pier structure is restored to the original position. And the earthquake energy can be dissipated through the two energy dissipation devices, so that the pier can be recovered to be used after an earthquake without repairing or slightly repairing, the earthquake resistance of the pier structure is greatly improved, and the basic transportation function of the bridge structure is ensured.

The utility model has the beneficial effects that:

(1) according to the utility model, an external soft steel energy dissipater is used as a first energy dissipation defense line, and an internal stainless steel bar is used as a second energy dissipation defense line; the external soft steel energy dissipater adopts soft steel with a low yield point, and the yield time of the external soft steel energy dissipater is earlier than that of the stainless steel bars, so that the external soft steel energy dissipater plays a certain role in protecting the internal stainless steel bars, prevents the stainless steel bars from yielding too early, is favorable for the continuous exertion of the energy dissipation capacity of the pier structure under the action of an earthquake, and improves the safety performance of the pier structure; the steel plate shell in the external mild steel energy dissipater can isolate air and water in the external environment, and prevent the mild steel and the self-resetting spring from being corroded. The self-reset spring does not play an energy consumption role, but can provide a limiting or resetting function, and provides self-resetting capability for the structure together with the BFRP rib, so that the residual deformation of the pier after the earthquake is reduced. And the external soft steel energy dissipater is easy to replace after earthquake, and accords with the concept of a recoverable function earthquake-resistant structure.

(2) According to the utility model, the high-performance new material ECC is introduced to the plastic hinge area of the prefabricated pier, so that the characteristics of strain hardening, multi-joint cracking, high ductility and the like of the ECC material can be utilized to dissipate energy of earthquake energy, the peeling of a concrete protective layer and the buckling of longitudinal bars can be inhibited to a certain extent, and the excellent crack control capability can greatly improve the durability of the pier structure.

(3) According to the utility model, the stainless steel bars are adopted as the built-in energy-consuming steel bars, and the performance of the built-in energy-consuming steel bars is related to the energy-consuming capacity of the whole structure, so that once the built-in energy-consuming steel bars are corroded, the energy-consuming capacity is greatly reduced, and a good energy-consuming effect cannot be achieved. The corrosion problem of the built-in energy-consuming steel bars can be solved essentially by adopting the stainless steel bars, the hysteresis curve of the stainless steel bars is fuller, the energy-consuming capability is excellent, the ductility is good, the steel bars are prevented from being broken in the earthquake process to fully consume energy, and the later maintenance cost of the pier is reduced.

(4) The pier main body and the bearing platform are connected by adopting BFRP (basalt fiber reinforced composite) ribs, and prestress is applied to the BFRP ribs and generated in the structure by utilizing the retraction of the BFRP ribs, so that the self-resetting capability is provided for the structure. Compared with common reinforcing steel bars and steel strands, the BFRP reinforcing steel bars have high strength and low elastic modulus, so that the prestress loss value generated by concrete shrinkage and creep is obviously low; and the tensile stress-strain relation of the BFRP material is close to linear elasticity, so that plastic deformation does not exist, and the self-resetting and repairability of the structure are more favorably realized. In addition, common steel is easy to corrode in a corrosive environment, the corrosion rate is further increased due to the high prestress level of the common steel, and the BFRP rib has high corrosion resistance and can greatly improve the durability and safety of a concrete structure.

(5) The BFRP rib adopts a steel plate anchoring structure, in the unbonded prestressed structure, the holding of the tensile force of the prestressed rib and the transmission of the prestressed rib to the concrete completely depend on the prestressed anchoring end, and the anchoring structure can increase the contact area of the BFRP rib and the concrete and increase the anchoring force of the BFRP rib on one hand, thereby preventing the BFRP rib from falling off or slipping under the action of an earthquake. On the other hand, the stress concentration phenomenon of the anchoring section can be reduced, and the phenomenon that the local concrete of the bearing platform is cracked and peeled off due to overlarge stress of the anchoring end of the anchor rod, so that the anchoring is failed, is avoided.

In the earthquake process, the prefabricated pier structure returns to the original form through the self-weight of the structure and the self-resetting member, the pier enters a swinging motion state, external vibration is isolated, damage is reduced, two energy dissipation devices consume earthquake energy, the safety of the pier structure is guaranteed, the pier structure cannot be greatly damaged after the earthquake, and the using function of the bridge structure can be quickly recovered after the pier structure is simply repaired. The pier structure has the characteristics of high energy consumption capability and self-recovery, and has strong popularization and application values.

Drawings

Fig. 1 is a schematic structural view of a pier of the present invention;

FIG. 2 is a cross-sectional view taken along line A-A of FIG. 1;

FIG. 3 is a cross-sectional view taken along line B-B of FIG. 1;

FIG. 4 is a schematic plan view of an external mild steel energy consumer according to the present invention;

FIG. 5 is a schematic structural view of an external mild steel energy consumer according to the present invention;

fig. 6 is a schematic view of a steel plate anchoring structure in the present invention.

In the figure: 1-reinforced concrete section, 2-BFRP rib, 3-ECC material reinforcing section, 4-lug plate, 5-bearing platform, 6-steel plate anchoring structure, 6-1-round steel plate, 6-2-central steel pipe, 7-built-in stainless steel bar, 8-external soft steel energy dissipater, 8-1-low yield point soft steel, 8-2-self-reset spring, 8-3-steel plate shell, 8-4-connector, 9-high strength bolt, 10-clip type anchorage device and 11-concave-convex structure.

Detailed Description

The utility model is further illustrated by the following figures and examples. Fig. 1 to 6 are drawings of embodiments, which are drawn in a simplified manner and are only used for the purpose of clearly and concisely illustrating embodiments of the present invention. The following claims presented in the drawings are specific to embodiments of the utility model and are not intended to limit the scope of the claimed invention. All other embodiments, which can be obtained by a person skilled in the art without inventive step based on the embodiments of the present invention, are within the scope of protection of the present invention.

In the description of the present invention, it is to be understood that the terms "upper", "lower", "inner", "outer", "left", "right", and the like indicate orientations or positional relationships based on orientations or positional relationships shown in the drawings, or orientations or positional relationships conventionally placed when the products of the present invention are used, or orientations or positional relationships conventionally understood by those skilled in the art, which are merely for convenience of description and simplification of 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, should not be construed as limiting the present invention.

The embodiment provides a prefabricated pier structure of external energy dissipator, as shown in fig. 1 to 3, the pier structure includes a pier main body, a bearing platform 5, an internal stainless steel bar 7 and an external soft steel energy dissipator 8, the pier main body includes a reinforced concrete section 1 on the upper portion and an ECC material reinforcing section 3 on the lower portion and engaged with the bearing platform 5, the ECC material reinforcing section 3 and the reinforced concrete section 1 are prefabricated for a factory and are connected through four BFRP (bidirectional Forwarding resistance) ribs 2, and the ECC material reinforcing section 3 and the bearing platform 5 are connected through a concave-convex structure 11. The main body of the pier is connected with a bearing platform 5 through BFRP ribs 2, the BFRP ribs 2 are arranged at the center of a pier column of the pier at intervals, each BFRP rib 2 straightly penetrates through the whole main body of the pier body without bending, one end of each BFRP rib is anchored in the bearing platform 5 through a steel plate anchoring structure 6, and the other end of each BFRP rib is anchored on the top surface of the reinforced concrete section 1 through a clamping piece type anchorage device 10; as shown in FIG. 4, the steel plate anchoring structure 6 comprises a central steel pipe 6-2 and 2-4 circular steel plates 6-1 welded on the steel pipe 6-2, and the lower end of the BFRP rib 2 penetrates through the central steel pipe 7 to be fixedly connected with the bottom circular steel plate 6-1. The built-in stainless steel bars 7 are arranged at the joint of the ECC material reinforcing section 3 and the bearing platform 5, the upper ends of the built-in stainless steel bars 7 are arranged on the ECC material reinforcing section 3, the distance between each built-in stainless steel bar 7 and the outer surface of the pier column is 40-80 mm, and the lower ends of the built-in stainless steel bars are arranged in the depth of the bearing platform 5 to be 200-500 mm; and the lower end of each built-in stainless steel bar 7 is bent into an angle of 90 degrees, and the bending length is 500-1000 mm.

According to the prefabricated pier structure of the external energy dissipator, provided by the embodiment, as shown in the figures 1 to 3, the external soft steel energy dissipator 8 comprises two groups of soft steel energy dissipators which are symmetrically arranged on two sides of a pier main body along a transverse bridge direction and form an angle of 30-60 degrees with a bearing platform 5, as shown in the figure 5, each group of soft steel energy dissipators comprises low-yield-point soft steel 8-1, self-resetting springs 8-2, steel plate shells 8-3 and connectors 8-4, the low-yield-point soft steel 8-1 is located in the middle of the steel plate shells 8-3, the self-resetting springs 8-2 are symmetrically arranged on two sides of the low-yield-point soft steel 8-1, and the connectors 8-4 are respectively arranged at two ends of the steel plate shells 8-3; the side face of the pier main body and the upper portion of the bearing platform 5 are correspondingly provided with the lug plates 4, and the connectors 8-4 at the two ends of the soft steel energy dissipater are connected with the corresponding lug plates 4 through high-strength bolts 9. Two connectors 8-4 are symmetrically arranged at two ends of the steel plate shell 8-3 respectively, two lug plates 4 are symmetrically arranged at two sides of the ECC material reinforcing section 3 respectively, and two lug plates 4 are arranged on bearing platforms 5 at two sides of the pier main body respectively.

The ECC mix proportion in the embodiment is selected and prepared according to the study on the anti-seismic performance test of the high-ductility concrete reinforced concrete beam in the academic paper. Cement: fly ash: river sand: water: 1 of water reducing agent: 1: 0.72: 0.58: 0.01. the volume mixing amount of the PVA fiber is 2% of the volume of the test piece, and the mechanical property of the PVA fiber is as follows: the length is 12mm, the diameter is 0.39mm, the tensile strength is 1600MPa, the elastic modulus is 40GPa, and the elongation is 7 percent.

The utility model is further explained by combining a specific construction process, and the construction process of the novel prefabricated bridge pier structure specifically comprises the following steps:

the method comprises the following steps: and prefabricating the ECC material reinforced section 3 and the reinforced concrete section 1. And (4) carrying out blanking and binding work on the pier body steel bars according to the design drawing, and finishing the manufacturing of the pier body steel bar cage of each section of the pier. Processing and installing a wood template according to the section size of each section, reserving a section of pier body BFRP rib 2 and a stainless steel bar 7 hole channel by using a PVC pipe, fixing the PVC pipe with the reserved hole channel by using the wood template, and simultaneously embedding an ear plate 4 in an ECC material reinforcing section 3. And finally, pouring concrete and an ECC material for each section of pier component, vibrating to be compact and spraying water for maintenance, wherein the maintenance time can be adjusted according to the actual condition, but is not less than 14 d.

Step two: and (5) constructing a bearing platform. Leveling a field, measuring and setting off, excavating a foundation pit according to a construction scheme, chiseling a pier pile head and detecting the quality of a pile body after excavating to a designed depth. And then binding reinforcing steel bars of a bearing platform 5, processing and manufacturing a wooden template of the bearing platform 5, simultaneously embedding a steel plate anchoring structure 6 of a BFRP (bidirectional Forwarding resistance) rib 2, an ear plate 4 and a built-in stainless steel bar 7, erecting the BFRP rib 2, finally pouring concrete, vibrating and compacting, and watering, maintaining and forming.

Step three: and (6) assembling the prefabricated bridge piers. And after the main body of the pier and the bearing platform are maintained to the designed strength, assembling through BFRP ribs 2. Before assembling, the contact surface of the ECC material reinforcing section 3 and the reinforced concrete section 1 is manually polished to ensure that no protrusion or burr exists on the surface, and floating dust on the contact surface between the sections is cleaned. The joint part of the ECC material reinforcing section 3 and the reinforced concrete section 1 is uniformly coated with cement paste or epoxy resin glue with the thickness of 2 mm-5 mm, so that the shaking caused by the manufacturing error of the contact surface of the two sections is removed or the waterproof effect is achieved.

Step four: and (5) stretching the BFRP rib. The tensioning of pier BFRP rib 2 adopts the post-tensioning method, and the tensioning mode is for carrying out the stretch-draw through one end, and 5 bottoms of test piece cushion caps are steel sheet anchor structure 6, and the mound top position is the stretch-draw end, chooses for use clip formula ground tackle 10 anchor to anchor, carries out the symmetry stretch-draw to the pier body.

Step five: and an external mild steel energy dissipater 8 is installed. The external soft steel energy dissipater 8 is connected with the lug plates 4 arranged on the side face of the ECC material reinforcing section 3 and the upper part of the bearing platform 5 through high-strength bolts 9 and symmetrically arranged in the middle of the side edge of the pier along the transverse bridge direction at an angle of 30-60 degrees with the bearing platform. Thus, the construction of the bridge pier is completed.

While the present invention has been described with reference to the embodiments shown in the drawings, the present invention is not limited to the embodiments, which are illustrative and not restrictive, and it will be apparent to those skilled in the art that various changes and modifications can be made therein without departing from the spirit and scope of the utility model as defined in the appended claims.

Claims

1. The utility model provides a take prefabricated pier structure of external energy consumer which characterized in that: the pier structure comprises a pier main body, a bearing platform (5), built-in stainless steel bars (7) and an external soft steel energy dissipater (8), wherein the pier main body comprises a reinforced concrete section (1) at the upper part and an ECC material reinforcing section (3) with the lower part meshed with the bearing platform (5), the ECC material reinforcing section (3) and the reinforced concrete section (1) are connected into a whole through BFRP ribs (2) and are connected with the bearing platform (5) through the BFRP ribs (2), the lower end of the BFRP ribs (2) is anchored in the bearing platform (5) through steel plate anchoring structures (6), the upper end of the BFRP ribs is anchored on the top surface of the reinforced concrete section (1) through clamping piece type anchors (10), and the built-in stainless steel bars (7) are arranged at the joint of the ECC material reinforcing section (3) and the bearing platform (5); the external soft steel energy dissipaters (8) comprise two groups of soft steel energy dissipaters which are symmetrically arranged on two sides of the pier main body along the transverse bridge direction and form an angle of 30-60 degrees with the bearing platform (5), each group of soft steel energy dissipaters comprise low-yield-point soft steel (8-1), self-reset springs (8-2), steel plate shells (8-3) and connectors (8-4), the low-yield-point soft steel (8-1) is located in the middle of the steel plate shells (8-3), the self-reset springs (8-2) are symmetrically distributed on two sides of the low-yield-point soft steel (8-1), and the connectors (8-4) are respectively arranged at two ends of the steel plate shells (8-3); the side face of the pier body and the upper portion of the bearing platform (5) are correspondingly provided with the lug plates (4), and the connectors (8-4) at the two ends of the mild steel energy dissipater are respectively connected with the corresponding lug plates (4) through high-strength bolts (9).

2. The prefabricated pier structure with the external energy dissipator of claim 1, wherein: the ECC material reinforcing section (3) and the reinforced concrete section (1) are prefabricated for a factory and are connected through BFRP ribs (2), and the ECC material reinforcing section (3) and the bearing platform (5) are connected through a concave-convex structure (11).

3. The prefabricated bridge pier structure with the external energy dissipators as claimed in claim 1, wherein: the pier main body and the bearing platform (5) are connected through 4 BFRP ribs (2), the four BFRP ribs (2) are arranged at the center of a pier column at intervals, each BFRP rib (2) is straight and does not have the bent part and penetrates through the whole pier main body, one end of each BFRP rib is anchored in the bearing platform (5) through a steel plate anchoring structure (6), and the other end of each BFRP rib is anchored on the top surface of the pier main body through a clamping piece type anchorage device (10).

4. The prefabricated pier structure with the external energy dissipator of claim 1, wherein: the steel plate anchoring structure (6) comprises a central steel pipe (6-2) and 2-4 circular steel plates (6-1) welded on the steel pipe (6-2), and the lower end of the BFRP rib (2) penetrates through the central steel pipe (6-2) to be fixedly connected with the circular steel plate (6-1) at the bottom.

5. The prefabricated bridge pier structure with the external energy dissipators as claimed in claim 1, wherein: the upper end of the built-in stainless steel bar (7) is arranged on the ECC material reinforcing section (3), the distance between each steel bar and the outer surface of the pier stud is 40-80 mm, and the lower end of each steel bar is arranged in the depth of the bearing platform (5) to be 200-500 mm; and the lower end of each built-in stainless steel bar (7) is bent into an angle of 90 degrees, and the bending length is 500-1000 mm.

6. The prefabricated pier structure with the external energy dissipator of claim 1, wherein: two connectors (8-4) are symmetrically arranged at two ends of the steel plate shell (8-3), two lug plates (4) are symmetrically arranged at two sides of the ECC material reinforcing section (3), and two lug plates (4) are arranged on bearing platforms (5) at two sides of the pier main body.