论文部分内容阅读
以一座大跨悬索桥中塔沉井基础为工程背景,采用“m”法建立了沉井-土动力相互作用计算模型,研究了沉井-土动力相互作用对全桥结构地震反应的影响,并对其影响机理进行了探讨,最后分析了河床冲刷深度的变化对结构地震反应的影响。研究结果表明,沉井-土动力相互作用对边塔的地震反应影响较小,但会增大中塔的地震反应;考虑沉井-土动力相互作用时,在与基础的自振周期相近时,结构的地震反应表现出显著的共振效应,使得结构地震反应增大;河床冲刷深度变化对结构的地震反应有很大的影响,随着冲刷深度的增加,桥梁结构的地震反应并不是单调变化,而可能出现一个峰值。
Taking a large-span suspension bridge mid-tower caisson foundation as an engineering background, the calculation model of caisson-soil dynamic interaction was established by using “m ” method and the effect of caisson-soil dynamic interaction on the seismic response of full-bridge structure was studied The influencing mechanism was discussed. Finally, the influence of river bed depth on the seismic response was analyzed. The results show that the interaction between caisson and soil has little effect on the seismic response of the side tower, but it will increase the seismic response of the middle tower. When the caisson-soil dynamic interaction is considered, , The seismic response of the structure shows significant resonance effect and the seismic response of the structure increases. The variation of riverbed erosion depth has a great influence on the seismic response of the structure. With the increase of erosion depth, the seismic response of the bridge structure does not change monotonically , But a peak may appear.