不同相位差地震作用下钢管混凝土拱桥减震研究

Study of Seismic Mitigation of CFST Arch Bridge Under Action of Earthquake of Different Phase Differences

强震发生时大跨度钢管混凝土拱桥地面各支承处所受激励并不相同,按多点激励的模式进行地震反应分析较为合理。通过ANSYS建立三维有限元模型,以某99 m跨径的钢管混凝土拱桥为分析对象,在其拱脚设置粘滞阻尼器,考虑不同相位差行波效应进行地震响应分析,研究设置粘滞阻尼器的减震效果以及粘滞阻尼系数对减震效果的敏感性。

At the time of strong earthquake, the excitation to the ground supports of long span concrete-filled steel tube （CFST） arch bridge is not the same and the analysis of the seismic response based on the multi-point excitation mode will be rational. Taking a CFST arch bridge with span length 99 m as the analysis object, this paper analyzes the seismic response of the bridge by means of the three-dimensional finite element model established by ANSYS, the viscous dampers set at the arch springs of the bridge and the consideration of traveling wave effect of different phase differences and also studies the seismic mitigation effect of the dampers and the sensitivity of the drag coefficients of the dampers to the effect of the seismic mitigation.