摘要
The seismic damage to ancillary facilities on high-speed railway(HSR)bridges can affect the normal movement of trains.To propose the bridge deck acceleration response spectra of the typical HSR simply-supported girder bridge for simplifying the seismic responses analysis of the facilities on bridges,the finite element models of the HSR multi-span simply-supported girder bridges with CRTSII track were established,and the numerical model was validated by tests.Besides,the effects of the span number,peak ground acceleration(PGA),pier height on the seismic acceleration and response spectra of the bridge deck were investigated.Afterward,the bridge acceleration amplification factor curves and bridge deck response spectra with different PGAs and pier heights were obtained.The formula for bridge deck acceleration amplification factor,with a 95%guarantee rate,was fitted.Moreover,the finite element models of the overhead contact lines(OCL)mounted on rigid base and bridges were established to validate the fitted formula.The results indicated that the maximum seismic acceleration response is in the midspan of the beam.The proposed formula for the bridge deck acceleration response spectra can be used to analyze the earthquake response of the OCL and other ancillary facilities on HSR simply-supported girder bridges.The bridge deck acceleration response spectra are conservative in terms of structural safety and can significantly improving the analysis efficiency.
地震对高速铁路桥梁上的附属设施造成破坏会影响列车的正常行驶。为提出典型高速铁路简支梁桥的桥面加速度反应谱,简化桥梁上附属设施的地震反应分析,建立了带CRTSII轨道的高速铁路多跨简支梁桥的有限元模型,并通过试验验证了该模型。此外,还研究了桥梁跨数、地面峰值加速度、墩高对桥面地震加速度和反应谱的影响。随后,得到了不同地面峰值加速度和不同桥墩高度下的桥面加速度放大系数曲线和桥面反应谱。在95%的保证率下,拟合了桥面加速度放大系数公式。此外,为了验证拟合公式,分别建立了安装在刚性基础和桥梁上的架空接触网的有限元模型。结果表明,最大地震加速度响应位于梁的跨中。所提出的桥面加速度反应谱公式可用于分析高铁简支梁桥上及其他附属设施的地震反应。桥面加速度反应谱应用在结构安全方面是保守的,并能显著提高分析效率。
作者
LIU Bo-lun
HE Chang
LAI Zhi-peng
JIANG Li-zhong
LI Dong-ping
刘博伦;何畅;赖智鹏;蒋丽忠;李东平(School of Civil Engineering,Central South University,Changsha 410075,China;National Engineering Research Center of High-Speed Railway Construction Technology,Changsha 410075,China;Hunan Tieyuan Civil Engineering Testing Co.,Ltd.,Changsha 410075,China)
基金
Project(HNTY2022K03)supported by the Hunan Tieyuan Civil Engineering Testing Co.,Ltd.,China
Project(52478573)supported by the National Natural Science Foundation of China。
