The commonly used deflection measurement methods include theodolites, level gauges, and dial indicators, which have disadvantages such as inconvenient use, difficulty in real-time measurement, and susceptibility to environmental influences. Considering that the deformation of the bridge under live load is smooth and continuous, there is a derivative relationship between the deflection of the bridge main beam and the inclination angle of the section. Therefore, inclination sensors can be used to test the structural deflection.
This method uses a structural finite element model to calculate the deflection curve of a unit load acting at different positions, and uses this deflection curve as the reference displacement mode, while the real deflection is a linear combination of the reference displacement modes; The determination of the combination coefficient adopts the method of least squares fitting on the inclination test data, effectively reducing the influence of test errors. Meets engineering requirements and is suitable for online deflection monitoring.
Assuming that the deflection curve of the bridge main beam is continuously differentiable, the derivative of the deflection curve line with respect to position is equal to the tangent of the section angle.
Wuxi Huilian single axis and dual axis tilt sensors are both based on advanced MEMS technology. The product has analog output and RS485, RS232, CAN digital output, etc., with high accuracy, excellent anti vibration and long-term stability. In the temperature range of -40-85 ° C, the zero drift is less than 0.2 °, the measurement range is from 0 to ± 180 °, the nonlinearity is better than 0.02, and the repeatability is excellent. Due to the advanced anti vibration technology adopted by the sensing unit, the problem of large data changes in the tilt sensor under vibration environment has been solved. The module is insensitive to vibration and can withstand impacts higher than 1000g.
