A self-compensating concrete-integrated strain gauge

Abstract

The invention discloses a self-compensating concrete integrated strain gauge, which is mainly characterized in that a compensation resistor is provided on the strain gauge, the compensation resistor and the working piece form a half-bridge or full-bridge working mode, and the compensation resistor adopts a high-precision resistor with no stress output Or small grid strain gauges, which can automatically compensate the influence of temperature on the bridge and wires, overcome the difficulty that it is impossible to equip each measuring point with a compensation block and ensure that its temperature and change are consistent; it can also eliminate the influence of wire length on detection sensitivity At the same time, the reinforced fiber insulation base and flexible waterproof sealing material are used to carry out the overall waterproof sealing treatment, which not only ensures the technical requirements of the insulation resistance of the strain gauge, but also has the effect of convenient, fast, accurate and safe on-site installation. .

Description

Technical field [0001] The invention relates to a resistance strain gauge, which is a special strain gauge for concrete. Background technique [0002] Theoretically, the stress-strain test of the structure has the highest accuracy of the resistance strain test, but in the past field tests of concrete structures, the accuracy of the strain test directly attached to the resistance strain gauge is mostly not up to the requirement, and many of them still fail. The main reasons are as follows: [0003] 1. It is difficult to perform temperature compensation on the strain gauge [0004] Because the concrete structure is directly affected by factors such as direct sunlight, wind, and rain, the temperature field of the concrete structure changes in a very complex and intense manner. A measuring point is equipped with a compensation block to ensure that its temperature and change are consistent. It is indeed a very difficult task to effectively compensate the temperature difference ...

AI Technical Summary

Problems solved by technology

[0007] 3. The influence of wire resistance on detection sensitivity is not strictly corrected

[0008] In the on-site stress test of engineering structures, the detection sections and measurement points are relatively scattered, resulting in a large difference in the length of the connecting wires, and the influence of wire resistance on the detection sensitivity is inconsistent. Due to the troublesome measurement records, many people did not make corrections.

Images