Digital Model Construction and Precision Structural Analysis Of Bridges Based On Full Field and Life Circle Intensive Measurement

摘要

Two aspects are needed to improve in the research and practice of current bridge structural test. First, test data is incomplete compare with calculation data, and survey times are insufficient compare with the bridge life circle. Second, although the analysis and calculation accuracy can not be always guarantee, the test program is formulated based on the results of structural analysis and calculation, and the assessment of the test results is determined by the comparison of the structural calculation results and the measured results. Therefore, digital image methods are suggested here for the full-field and spatially intensive measurement of the bridge. And the digital test structural models and the parametric test models which are isomorphic with the calculation model are suggested to construct based on the full-field data. Consistent with the stages of the structure life circle, multiple generations of digital design model, digital calculation model, digital measurement model and digital test model are established through intensive inspection, testing and identification. The 4 types of digital models are integrated in digital model set. The parameters and outputs of the set are precisely analyzed. Digital consistency and convergence of the parameters and output results of the sets of all generations are studied. Current state and previous history of the bridge structure is graphically and digitally represented by the comparison results of the contemporary digital model set with each generation of digital models set. The future state and static or dynamic load test of the bridge structure are virtue described and performed. The virtue test results are used to construct the virtue digital model sets of the bridge structure. The structure aging process is recorded and expected, the structure load capacity is digitally expressed, and the structure remaining life is estimated through the precisely analysis of the property characteristics, track changes, trends and development process of the various parameters and the response of the digital model sets.