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针对某带风缆且索塔底部铰接管线悬索跨越工程,输入三条频谱特性不同的地震波,采用时程分析法研究地震激励作用对管线悬索桥结构关键部位内力及位移的影响.研究结果表明:在加速度峰值相同但频谱特性不同的地震波激励下桥梁结构地震反应存在显著差异;由于塔底铰接,主缆内力在地震力作用下变化显著;管线弯曲内力在地震载荷作用下变化幅度较大,考虑到其特殊的使用性,在抗震设防时必须优先考虑管线结构的抗震能力.
In this paper, three seismic waves with different spectral characteristics are input into a suspension cable-stayed bridge with a wind-driven cable and the bottom of the tower. The time-history analysis is used to study the effect of seismic excitation on the internal forces and displacements of the key parts of the suspension bridge. Because of the hinge of the bottom of the tower, the internal force of the main cable changes obviously under the action of the earthquake force. The internal force of pipeline bending changes greatly under the action of the earthquake load. Considering that the seismic response of the bridge structure is different under seismic excitation with the same peak acceleration but different spectral characteristics, Its special usability, seismic fortification must give priority to the earthquake resistance of pipeline structure.