CN210420905U

CN210420905U - Seismic damage pier mixed reinforcement structure based on shape memory alloy and carbon fiber cloth

Info

Publication number: CN210420905U
Application number: CN201921219577.6U
Authority: CN
Inventors: 李彬彬; 刘博�; 何露; 李�昊; 刘洋
Original assignee: Xian University of Architecture and Technology
Current assignee: Xian University of Architecture and Technology
Priority date: 2019-07-16
Filing date: 2019-07-30
Publication date: 2020-04-28
Anticipated expiration: 2029-07-30
Also published as: CN110359379A

Abstract

The utility model discloses a seismic damage pier mixing and reinforcing structure based on shape memory alloy and carbon fiber cloth, which comprises a sleeve extrusion joint for connecting fracture steel bars in the seismic damage pier and quick-setting cement-based mortar for replacing and filling loose concrete around the seismic damage pier and repairing cracks on the surface of the seismic damage pier, wherein an epoxy resin layer and the carbon fiber cloth are sequentially arranged on the surface of the pier body of the seismic damage pier from inside to outside, a steel plate pressing strip for pressing the carbon fiber cloth is fixed at the bottom of the seismic damage pier, and NiTiNb shape memory alloy wires are wound on the outer surface of the carbon fiber cloth, during construction, the NiTiNb shape memory alloy wire is connected with external thermal excitation power supply equipment for activating the shape memory effect of the NiTiNb shape memory alloy wire, this reinforced structure can combine together through initiative restraint power and passive restraint power and realize the reinforcement of the earthquake damage pier, and the cost is lower, and the durability is better.

Description

Seismic damage pier mixed reinforcement structure based on shape memory alloy and carbon fiber cloth

Technical Field

The utility model belongs to the technical field of engineering structure reinforcement, a shake and decrease pier mixes reinforced structure based on shape memory alloy and carbon cloth is related to.

Background

Since the 50 s in the 20 th century, reinforced concrete structures have been widely used in bridge engineering in China due to their characteristics of firmness, durability, good fireproof performance and the like. However, with the lapse of service time and the influence of environment, even a bridge with better material selection, reasonable design and guaranteed construction quality can be continuously aged, various diseases such as exposed ribs, pitted surfaces, surface layer blocking and falling and the like are generated, and the safety performance of the structure has hidden troubles. Particularly, under the action of an earthquake, once the bridge pier is damaged, a large amount of economic loss can be caused, and even serious life safety threat can be generated. The reinforced concrete pier is a ductile member, and can dissipate energy through the bending deformation of a plastic hinge area when bearing a large earthquake load, so that how to reinforce the earthquake-damaged pier becomes particularly important.

The lateral restraint can improve the brittleness of concrete and improve the strength and the deformability of the reinforced concrete member. Concrete restraint methods are divided into active and passive methods. For active restraint of concrete, the lateral restraint is applied to the structural member in the form of a pre-stress prior to the application of the axial compressive force. Whereas for passive restraint, the restraining force is applied indirectly to the elements as a result of the compressive lateral expansion of the concrete. However, the existing active constraint means and passive constraint means have the defects that: for passive restraint, the concrete is inevitably damaged to some extent in order to fully "activate" the passive restraint. For active restraint, at present, the most common materials for active restraint reinforcement of concrete are steel (prestressed steel wires, prestressed steel strands and prestressed steel plate hoops) and fiber reinforced composites (FRP). However, the steel material is easily rusted and has poor durability. FRP is attached to the surface of a member using an epoxy resin layer as an adhesive, and may be detached. In addition, the application of the prestress of the two materials needs a special tensioning device, and the labor, material and financial resources are excessively consumed.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to overcome above-mentioned prior art's shortcoming, provide a seismic damage pier mixed reinforced structure based on shape memory alloy and carbon cloth, this reinforced structure can combine together the reinforcement that realizes seismic damage pier through initiative restraint power and passive restraint power, and the cost is lower, and the durability is better.

In order to achieve the purpose, the earthquake damage pier mixed reinforcement structure based on shape memory alloy and carbon cloth comprises a sleeve extrusion joint and quick-setting cement-based mortar, wherein the sleeve extrusion joint is used for connecting fracture reinforcing steel bars in the earthquake damage pier, the quick-setting cement-based mortar is used for replacing and filling loose concrete around the earthquake damage pier and repairing cracks on the surface of the earthquake damage pier, an epoxy resin layer and the carbon cloth are sequentially arranged on the surface of a pier body of the earthquake damage pier from inside to outside, a steel plate pressing strip used for pressing the carbon cloth is fixed at the bottom of the earthquake damage pier, a NiTiNb shape memory alloy wire is wound on the outer surface of the carbon cloth, and when construction is carried out, the NiTiNb shape memory alloy wire is connected with an external thermal excitation power supply device used for activating the shape memory effect of the NiTiNb shape memory.

The carbon cloth upwards twines on the outer wall of the bridge pier that decreases that shakes from the bottom of the bridge pier that decreases that shakes along the axial, and the winding height of carbon cloth is 1/3 of the bridge pier height that decreases that shakes.

The steel plate pressing strip is fixed at the bottom of the seismic damage pier through a bolt.

The NiTiNb shape memory alloy wires are spirally wound on the outer side of the carbon fiber cloth at a pitch of 40 mm.

The utility model discloses following beneficial effect has:

seismic damage pier mixed reinforcement structure based on shape memory alloy and carbon cloth when concrete operation, be provided with carbon cloth and NiTiNb shape memory alloy silk in the outside of seismic damage pier, the passive restraint that provides through carbon cloth and the initiative restraint that NiTiNb shape memory alloy silk provided combine organically, with the anti lateral rigidity and the ductility that restore and improve seismic damage pier, simple structure, the construction is simple and convenient, can effectively overcome traditional initiative restraint reinforcement method prestressing force and apply the step loaded down with trivial details, the heavy and serious scheduling defect of prestressing force construction machinery of prestressing force, and effectively promote engineering structure quality and construction speed, and the cost is lower, the durability is better. In addition, it should be noted that the NiTiNb shape memory alloy wire can provide a permanently stable recovery stress, does not need mechanical tensioning, can generate a prestress through thermal excitation, is simple and effective to operate, and has high damping performance and strong energy consumption capability, so that the NiTiNb shape memory alloy wire plays a crucial role in improving the structure earthquake resistance.

Drawings

FIG. 1 is a schematic view of the structure of the present invention;

fig. 2 is a schematic view of the sleeve compression joint 2 connecting broken steel bars 9;

FIG. 3 is a schematic cross-sectional view of the present invention;

fig. 4 is a connection diagram of the NiTiNb shape memory alloy wire 5 and an external thermal excitation power supply device 8.

The seismic damage pier is characterized in that 1 is a seismic damage pier, 2 is a sleeve extrusion joint, 3 is an epoxy resin layer, 4 is quick-setting cement-based mortar, 5 is NiTiNb shape memory alloy wires, 6 is carbon fiber cloth, 7 is a steel plate pressing strip, 8 is external thermal excitation power supply equipment, and 9 is a broken steel bar.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings:

referring to fig. 1 to 4, the mixed reinforced structure of loss of earthquake pier based on shape memory alloy and carbon cloth including being used for connecting the sleeve extrusion joint 2 of the interior fracture reinforcing bar 9 of loss of earthquake pier 1 and being used for replacing and filling loose concrete and the quick setting cement base mortar 4 of restoring the 1 surperficial fissures of loss of earthquake pier around the loss of earthquake pier 1, the pier shaft surface of loss of earthquake pier 1 has set gradually epoxy layer and carbon cloth 6 from inside to outside, the bottom of loss of earthquake pier 1 is fixed with the steel sheet layering 7 that is used for compressing tightly carbon cloth 6, the surface winding of carbon cloth 6 has NiTiNb shape memory alloy silk 5, when the construction, NiTiNb shape memory alloy silk 5 is connected with the outside thermal excitation power supply unit 8 that is used for activating the shape memory effect of NiTiNb shape memory alloy silk 5.

The carbon fiber cloth 6 is wound on the outer wall of the seismic damage pier 1 from the bottom end of the seismic damage pier 1 upwards along the axial direction, and the winding height of the carbon fiber cloth 6 is 1/3 of the height of the seismic damage pier 1; the steel plate pressing strip 7 is fixed at the bottom of the seismic damage pier 1 through a bolt; the NiTiNb shape memory alloy wires 5 are spirally wound on the outside of the carbon fiber cloth 6 at a pitch of 40 mm.

The utility model discloses an implementation process does:

1) removing loose concrete around the seismic damage pier 1;

2) straightening the bent longitudinal bars and connecting the broken bars 9 using the sleeve squeeze joints 2;

3) replacing the removed concrete with quick-setting cement-based mortar 4 and repairing cracks on the surface of the earthquake-damaged pier 1;

4) coating an epoxy resin layer on the surface of the seismic damage pier 1, and sticking the carbon fiber cloth 6 on the surface of the seismic damage pier 1;

5) a NiTiNb shape memory alloy wire 5 is helically wound to the post damaged area and the NiTiNb SMA shape memory effect is activated using an external thermal excitation power supply device 8.

The present embodiment is only for explaining the present invention, and it is not limited to the present invention, and those skilled in the art can make modifications to the present embodiment without inventive contribution as required after reading the present specification, but all of them are protected by patent law within the scope of the claims of the present invention.

Claims

1. A seismic damage pier mixed reinforcement structure based on shape memory alloy and carbon fiber cloth is characterized by comprising a sleeve extrusion joint (2) used for connecting broken steel bars (9) in a seismic damage pier (1), and quick-setting cement-based mortar (4) used for replacing and filling loose concrete around the seismic damage pier (1) and repairing cracks on the surface of the seismic damage pier (1), wherein an epoxy resin layer and the carbon fiber cloth (6) are sequentially arranged on the surface of a pier body of the seismic damage pier (1) from inside to outside, a steel plate pressing strip (7) used for pressing the carbon fiber cloth (6) is fixed at the bottom of the seismic damage pier (1), NiTiNb shape memory alloy wires (5) are wound on the outer surface of the carbon fiber cloth (6), during construction, the NiTiNb shape memory alloy wire (5) is connected with an external thermal excitation power supply device (8) for activating the shape memory effect of the NiTiNb shape memory alloy wire (5).

2. The seismic damage pier hybrid reinforced structure based on the shape memory alloy and the carbon fiber cloth as claimed in claim 1, wherein the carbon fiber cloth (6) is wound on the outer wall of the seismic damage pier (1) from the bottom end of the seismic damage pier (1) in the axial direction upwards, and the winding height of the carbon fiber cloth (6) is 1/3 of the height of the seismic damage pier (1).

3. The seismic pier hybrid reinforcement structure based on the shape memory alloy and the carbon fiber cloth as claimed in claim 1, wherein the steel plate batten (7) is fixed to the bottom of the seismic pier (1) through bolts.

4. The seismic damage pier hybrid reinforced structure based on the shape memory alloy and the carbon fiber cloth of claim 1, wherein the NiTiNb shape memory alloy wires (5) are spirally wound on the outer side of the carbon fiber cloth (6) at a pitch of 40 mm.