Publish Time: 2021-12-20 Origin: Site
First of all, for the use of the heavy weight deflectometer, take the detection of bridge deflection as an example: install the heavy weight deflectometer on the detector bracket and place it in contact with the measured point on the bridge. In the same way, install the others in order according to the points to be measured. Deflection detector. Connect the deflection detector to the terminal controller through a transmission cable. When the bridge undergoes deflection and deformation after the bridge is loaded, a corresponding displacement and deformation sensor is placed on the deflection detector to measure the corresponding deformation and displacement and transmit it to the terminal controller. The terminal controller displays the maximum deflection and minimum deflection of the corresponding bridge vibration through software processing.
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Introduction to heavy weight deflectometer
How to use heavy weight deflectometer
The heavy weight deflectometer can measure the level of rotation changes at any angle, used to track the distance of the instrument, the measurement of dynamic elastic curvature, preliminary acceptance, identification; military floating bridges, suspension bridges and other special trajectory detection; moving deformation and displacement monitoring; or Deformation and vibration displacement of beams, columns, high-rise buildings, mechanical machinery, large elastic platforms, existing dynamic and static load experiments, various mechanical arms, cantilever displacement detection, etc. of span structures.
First of all, for the use of the heavy weight deflectometer, take the detection of bridge deflection as an example: install the heavy weight deflectometer on the detector bracket and place it in contact with the measured point on the bridge. In the same way, install the others in order according to the points to be measured. Deflection detector. Connect the deflection detector to the terminal controller through a transmission cable. When the bridge undergoes deflection and deformation after the bridge is loaded, a corresponding displacement and deformation sensor is placed on the deflection detector to measure the corresponding deformation and displacement and transmit it to the terminal controller. The terminal controller displays the maximum deflection and minimum deflection of the corresponding bridge vibration through software processing.
This study presents a comparison between measured deflections and deflections computed using the Spectral Element Method (SEM) which was implemented during this work. The tested pavement was built within the test facility of the French Civil Aviation Technical Center (STAC). It is equipped with temperature probes at several depths within bituminous layers. The Spectral Element Method is a semi-analytical method in frequency domain. The pavement response is computed for unit load and for each frequency (from 1–200 Hz, every 1 Hz) at each geophone location, which leads to the Frequency Response Function (FRF). Then, frequency-domain deflections are obtained by weighting the FRF when calculating the Fast Fourier Transform (FFT) of the measured HWD load. This method is numerically efficient and shows good potential to solve axisymmetric multilayered problems. In particular, it allows to take into account frequency-dependent complex modulus analytical expressions. Spectral Element Method results have been validated with time-domain Finite Element Method data computed on a common pavement structure. SEM which is much faster than FEM shows great potential for further backcalculations application.
Nanjing T-Bota Scietech Instruments & Equipment Co., Ltd reminds you to read the maintenance methods of the heavy weight deflectometer carefully so that its service life can be prolonged.