Steel-concrete composite structure damage measurement system

Abstract

The invention discloses a steel-concrete composite structure damage measurement system. The system comprises: a fiber bragg grating measurement group, a fiber bragg grating temperature compensation group, a fiber bragg grating demodulator, a display, an acoustic emission measurement device and an extensometer. The fiber bragg grating measurement group and the fiber bragg grating temperature compensation group are arranged on the surface of a steel beam at the interface of a longitudinal steel-concrete composite bridge, the surface of a steel beam at the interface of a transverse steel-concretecomposite bridge and the surface of an embedded steel bar in a steel-concrete composite structure; wherein the fiber bragg grating measurement group and the fiber bragg grating temperature compensation group are connected to the fiber bragg grating demodulator, the fiber bragg grating demodulator is connected to the display, and the acoustic emission measurement device comprises an acoustic emission sensor, a data line, a sensor fixation device and an acoustic emission acquisition instrument; the acoustic emission sensor is installed on the surface of a concrete slab and is connected to the acoustic emission acquisition instrument through a data line, and the acoustic emission acquisition instrument is connected to the display. The extensometer is pre-buried in concrete and used for measuring the displacement difference between the steel beams and concrete.

Description

technical field [0001] The invention belongs to the fields of optical fiber grating sensing detection, acoustic emission detection, displacement measurement and the like, and in particular relates to a comprehensive damage measurement system for steel-concrete composite structures under stress. Background technique [0002] Steel-concrete composite structures can give full play to the mechanical properties and advantages of steel and concrete, and are widely used in bridge structures. In the steel-concrete composite structure, a large number of shear connectors are usually set between the steel structure and the concrete structure to ensure that the structure composed of two different materials can work together and work together. Slippage and cracking etc. occur at the interface. The mechanical properties of the steel structure and concrete structure at the composite structure interface are the key to the performance of the steel-concrete composite structure. Therefore, ho...

AI Technical Summary

Problems solved by technology

The existing strain measurement technology has disadvantages such as poor anti-electromagnetic interference ability, large measuring element size, and poor measurement stability, so it is not suitable for steel girder strain measurement of railway steel-concrete composite bridges.

②Provide an acoustic emission technology to measure the performance of concrete internal cracks in steel-concrete composite bridges, which solves the problem that the existing measuring equipment in the prior art cannot measure the internal cracks of concrete

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