Title: Experimental Study on Vehicle-Bridge Dynamic Characteristics of Thin-Walled Trough Girder Bridge for Urban Rail Transit
Abstract: Field tests were conducted on a standard span thin-walled trough girder bridge for the elevated urban rail transit.The free vibration characteristics of the bridge,such as the frequency,mode and damping ratio were got.The test data for both the bridge and train during the train passing through the bridge, including the displacement,amplitude,stress and the acceleration responses of the bridge and the acceleration of the carbody were obtained and analyzed.The analysis results show that the deflection-span ratio of the girder body is less than the code limit.No resonance phenomenon occurs as the train passing through the bridge.The vertical stiffness of the girder body meets the requirements.The transverse fundamental frequency of the girder span is greater than the code value while the transverse fundamental frequency of the bridge is smaller.The lateral amplitude at the pier top is larger.The transverse stiffness of the girder body meets the requirements,whereas the stiffness of the pier is somewhat insufficient.Local vibration is found in the roadbed slab and the web.Therefore, more attention should be paid to the local stability of running lines and the web when the design speed is increased.The total longitudinal bending dynamic coefficient of the girder body is smaller than specification regulated value.However,the local transverse bending dynamic coefficient of the roadbed slab is much larger than the total longitudinal bending dynamic coefficient of the girder body.The acceleration of the bridge deck is within the limit.Judging by Sperling index and ISO2631 evaluation index,the ride comfort of the test train running on the bridge is found to be excellent.According to the test and analysis,thin-walled trough girder is proved to be suitable for elevated urban rail transit.
Publication Year: 2011
Publication Date: 2011-01-01
Language: en
Type: article
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Cited By Count: 1
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