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| Analysis and Study of Train-bridge Coupling Dynamic Considering the Effect of Temperature Difference of Piers |
| ZHENG Xiao-long，YAN yong，FAN Qi-wu |
| (China Railway Eryuan Engineering Group Co. Ltd，Chengdu，Sichuan 610031，China ) |
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Abstract Research purposes:For the analysis of the impact of piers height change due to temperature changes on the train running of long span concrete continuous rigid frame bridge，taking a long span concrete continuous rigid frame bridge as an example，firstly the dynamic analysis model of the full bridge was built and the natural vibration characteristics were investigated. Then the coupling vibration equation of train-bridge system was established considering the height change influence of piers under two kinds of temperature system(without considering temperature change，considering temperature change of 20 0C)and the dynamic response was calculated under the two conditions based on the train running safety evaluation indexes in order to test whether the bridge has sufficient lateral and vertical rigidity and good operation stability of dynamic characteristics.
Research conclusions:(1)According to analysis of calculation results of the longitudinal and transverse displacement of the bridge all span，acceleration power index，the conclusion can be obtained:the changes of pier height has little effect on the dynamic response of the bridge temperature difference effect，the vibration response of the bridge can meet the requirements of the specification limits. (2)Considering the 20 0C effect of temperature difference condition，when the CRH2 and ICE3 EMU trains pass over the bridge，the calculation results of the derailment coefficient，reduction rate of wheel and the rate of wheel/rail lateral force，change little compared with the bridge under normal condition and meet the standard，train safety can be guaranteed.(3)Considering the 20 0C effect of temperature difference condition，when the CRH2 and ICE3 EMU trains pass over the bridge，the calculation results of earbody lateral and vertical acceleration， lateral and vertical Sperling index，change little compared with the bridge under normal condition，can meet the requirements of specification，pier height has a limited impact on the train comfort. (4)The research results can provide good reference and guidance for the related analysis and evaluation of similar railway bridges.
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Received: 24 May 2015
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2015, Vol. 32 
