Abstract
For the highway bridges with small or medium span, a vehicle will stay on the bridge after the excitation. So the measured values of the vibration characteristics of the bridge are related to the vehiclebridge system. In order to analyse the natural vibration characteristics of simply supported bridge and the loaded frequency of vehicle-bridge system, theoretical analysis was carried out firstly, then the simply supported beam calculation model was built based on finite element method, and the results were compared with the measured values. The finite element model of a mass block-simply supported beam system was built by regarding the vehicles as a concentrated mass block attached. Both the vibration modals of the bridge system and the loaded frequencies of the vehicle-bridge system under diffident vehicle positions were obtained by software analysing. As a result, the variation characteristics of the loaded frequency for this simply supported bridge were extracted and discussed through the comparison of the results from both finite element method and the measured.
Highlights
With the sustainable development of national economy and engineering technology, achievements of bridge construction change with each passing day
As an onsite test for highway bridges with short or medium span, their vibrations were excited usually by a single vehicle, and the vehicle will stay on the bridge after excitation, so the measured values of the bridge under the action of a single vehicle are the vibration characteristics of vehiclebridge system
The authors firstly analysed a supported steel beam theoretically, a finite element model was built based on the software of Ansys, and the analysis results were compared with the measured values
Summary
With the sustainable development of national economy and engineering technology, achievements of bridge construction change with each passing day. The literatures show that the frequency differences between the vehicle-bridge system and bridge structure cannot be neglected [1], of even larger [2] than the changes of structural damage. The authors firstly analysed a supported steel beam theoretically, a finite element model was built based on the software of Ansys, and the analysis results were compared with the measured values. The finite element model of a mass block- supported beam system was built by regarding the vehicles as a concentrated mass block attached. The analysis results from software were compared with the tested values, and the authors gave some useful conclusions which are appreciated for reference
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