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Steel-concrete interface damage monitoring and reinforcing method based on shape memory alloy

A technology of memory alloy and damage monitoring, which is applied in measuring devices, building maintenance, instruments, etc., can solve the problem that there is no effective method for damage monitoring of steel-concrete composite beam interface, so as to prevent serious structural damage and ensure structural safety Good effect with durability, compatibility

Inactive Publication Date: 2018-11-13
DALIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, there are few studies on the microscopic damage of the interface of composite structures, and there is no effective method for monitoring the interface damage of steel-concrete composite beams.

Method used

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  • Steel-concrete interface damage monitoring and reinforcing method based on shape memory alloy
  • Steel-concrete interface damage monitoring and reinforcing method based on shape memory alloy
  • Steel-concrete interface damage monitoring and reinforcing method based on shape memory alloy

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Experimental program
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Effect test

Embodiment 1

[0038] Such as figure 1 As shown, this embodiment discloses a steel-concrete interface monitoring and active adjustable reinforcement method based on shape memory alloys, which monitors the damage state of the composite beam interface in real time, and imposes controllable reverse constraints on the composite beam interface according to the damage situation. force. The implementation plan includes: shaped steel beam SB, reinforced concrete slab RCS, interface connecting stud HS, shape memory alloy wire SMA, both ends of shape memory alloy wire SMA are connected with interface connecting stud HS and shaped steel beam SB, grouting port GH , wire W, measurement control system MC, etc.

[0039] The shape memory alloy wire SMA is obliquely arranged on the tensile side of the interface connection stud HS in the composite beam, one end is connected with the interface connection stud HS, and the other end is connected with the steel beam SB, and the shape memory alloy wire SMA is con...

Embodiment 2

[0043] Such as figure 2 As shown, in this embodiment, the two ends of the shape memory alloy wire SMA are respectively connected to two adjacent interfacial connection pegs HS, and are arranged parallel to the upper surface of the shaped steel beam SB. During the specific implementation process, the interface connecting studs HS undergo relative deformation under the action of external load, causing the shape memory alloy wire SMA to deform and change in resistance. The measurement and control system MC directly measures the relative deformation between the interface connecting studs HS, and indirectly calculates the composite beam Interface slip, finally determine the damage degree of composite beam interface. According to different interface damage levels, the measurement and control system MC controls the temperature of the shape memory alloy wire SMA to different degrees to make it recover and deform, and exerts different degrees of reverse recovery force on the interface...

Embodiment 3

[0045] Such as image 3 As shown, this embodiment discloses a method for monitoring and reinforcing studs at the steel-concrete interface connection based on shape memory alloys. This embodiment includes: shaped steel beam SB, reinforced concrete slab RCS, interface connecting stud HS, shape memory alloy wire SMA, wire W, measurement control system MC and so on.

[0046] In this embodiment, the shape memory alloy wire SMA is fixed on the tension side of the interfacial connection stud HS, and the two are co-deformed. The two ends of the shape memory alloy wire SMA are connected with the same interfacial connection peg HS, and the resistance and length of the shape memory alloy wire SMA change. It directly reflects the deformation of the interfacial connection stud HS. According to the different damage levels of the interface connecting stud HS, the measurement and control system MC controls the temperature of the shape memory alloy wire SMA to cause different degrees of recov...

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Abstract

The invention belongs to the field of civil engineering combined structure reinforcement and health monitoring., and relates to a steel-concrete interface damage monitoring and reinforcing method based on shape memory alloy. Shape memory alloy wires are buried in concrete and are connected with interface connection studs in a combined beam and a profile steel beam, or are fixed on the surfaces ofthe interface connection studs. An external measurement control system can obtain interface relative slippage and stud deformation damage information by monitoring the resistance and length change ofthe shape memory alloy wires. When the interface damage degree of the combined beam exceeds a certain threshold value, the shape memory alloy wires are subjected to heating control, and the shape memory alloy wires apply restoring force in the reverse direction of interface slippage or stud deformation in the combined beam, so that interface reinforcement is carried out. If the interface damage degree is serious, the interface can be grouted and reinforced through a reserved grouting opening. The implementation scheme is simple, flexible, high in feasibility and good in compatibility, interface monitoring and active adjustable reinforcing of the combined beam in a long period can be realized.

Description

technical field [0001] The invention belongs to the field of civil engineering composite structure reinforcement and health monitoring, and relates to a steel-concrete interface damage monitoring and reinforcement method based on a shape memory alloy. Background technique [0002] Steel-concrete composite beam is a new structural component with many advantages such as light weight, high rigidity, strong bearing capacity, good ductility, and convenient construction. It is widely used in various new buildings and special building structures, such as super high-rise structures, Heavy industrial buildings, large bridges and long-span space structures, etc. The steel-concrete composite beam mainly works together as a whole by setting shear connectors (such as studs, bolts, channel steel, bending bars, etc.) between the lower steel beam and the upper reinforced concrete flange plate. Steel and concrete have different material properties, and under load, there may be lifting and r...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E04G23/02G01D21/02
CPCE04G23/0218G01D21/02
Inventor 李冬生都方竹张月
Owner DALIAN UNIV OF TECH
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