Internal strain monitoring device and method for steel pipe concrete

Abstract

The invention discloses an internal strain monitoring device and method for steel pipe concrete. The device is composed of a strain sensing module, a positioning module and a data collection module; the strain sensing module is composed of a test base body, a strain rosette, a lead and a binding post; the positioning module is composed of a positioning pipe, a fixed handle, a movable handle, a torsion spring, a line ranger, an extended positioning rod, a wire rope, a rotating shaft, a spring and a calibrated scale; and the data collection module is composed of a data collector and a computer.The test base body is fixed in a predetermined position by the positioning module, the fixed handle is rotated to adjust the angle of the test base body, and concrete is placed and maintained; and thestrain of the test base body is monitored, and further strain in the predetermined position in the steel pipe concrete is monitored. The test base body is positioned accurately via the positioning module, disturbance of concrete placement to the position of the strain sensing module is eliminated, the problem that a present strain test component tends to offset in a sample is solved, and the device and method can be widely applied to the field of internal strain monitoring and test of concrete.

Description

technical field [0001] The invention relates to the technical field of deformation monitoring of steel pipe concrete, in particular to a device and method for monitoring internal strain of steel pipe concrete. Background technique [0002] Concrete filled steel pipe refers to a composite structure formed by pouring concrete in steel pipes. Concrete-filled steel tube members have the characteristics of high bearing capacity, good plasticity, and good fire resistance. The hoop constraint effect of the steel pipe on the core concrete makes the concrete in a state of lateral compression, and its compressive strength can be doubled. At the same time, due to the existence of concrete, the rigidity of the steel pipe is improved, and the two work together to increase the bearing capacity. However, it is difficult to monitor the internal strain of CFST due to the concealment of concrete during the stress process of CFST. [0003] Among the current CFST tests, there is a method to ...

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Problems solved by technology

However, it is difficult to monitor the strain inside the CFST due to the concealment of the concrete during the stress process of the CFST

[0003] Among the current CFST tests, there is a method to monitor cracks and voids at the interface between the steel pipe and concrete, but this method is limited to the interface between the steel pipe and concrete, and cannot monitor the internal strain of the CFST; there is also a method that uses lead sheet as the base sheet material (sticking strain gauges on it) is a method for monitoring the internal strain of concrete, but using metal materials such as lead sheets as the base sheet will cause large disturbances at the concrete cracking point, resulting in inaccurate results, especially preventing potential cracking points. The cracking of the steel pipe concrete cannot truly monitor the internal stress

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