Measure Point Layout of Modal Test of Highway Curved Beam Bridge
LIANG Dong1,2, ZHANG Congzheng1, CHEN Lei1
(1. School of Civil and Transportation, Hebei University of Technology, Tianjin 300401, China;
2. Civil Engineering Technology Research Center of Hebei Province, Tianjin 300401, China)
Abstract：In order to obtain the optimal layout of the measuring points for testing the modal shape of the highway curved beam bridge, the effective independent method was used to calculate the layout position of measuring points, and the modal assurance criterion was introduced to check the accuracy of the measuring points. Taking an actual three-span continuous curved beam bridge as an engineering background, the program of finding the location of corresponding measuring points by the effective independent method was compiled by MATLAB, and the sensor arrangement measuring points of the first 10 modes were calculated respectively. The angle of the modal vector space (PMACi value) of each modal measuring point was calculated, and four modes among them were selected for real bridge verification. The results show that most of the PMACi values meet the modal assurance criterion, and the results of real bridge test are very similar to those of the finite element modal, which indicates that the proposed scheme of measuring point arrangement can be applied to the modal test of three-span continuous curved beam bridge, and the effective independent method can effectively provide a reference for the measuring point layout of modal test of highway curved beam bridge under environmental excitation.
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2020, Vol. 39 
