Research on Seismic Response Characteristics of High-Speed Railway Hub StationStructure System Considering Pile-Soil Interaction
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摘要: 高铁枢纽车站作为关键交通基础设施,保证其抗震安全具有重要意义。以常德高铁枢纽车站结构为研究对象,选取代表性的强震记录作为基岩地震动,考虑场地工程地质特性、土体非线性和桩-土动力相互作用,采用有限元方法对高铁枢纽车站结构三维体系进行非线性地震反应分析。结果表明:考虑桩-土相互作用的高铁枢纽车站结构体系整体上呈现“上柔下刚”的特点,自振频率相比刚性地基假定的车站结构体系降低;在三种强地震动作用下,场地非线性地震效应显著,地表加速度显著放大,场地土的加速度与位移响应随着埋深增大逐渐减小;桩-土之间相互作用与场地非线性地震效应相关,两者共同变形来抵抗强地震动引起的地基变形,且两者相互作用的强度随着地震动强度的增大而增大;三种地震波中以Kobe波的卓越频率与车站结构体系自振频率最为接近,El Centro波次之;屋盖结构的存在导致车站框架结构地震响应随高度逐渐放大,且屋盖结构与下部框架结构连接处的地震响应放大最大,因此导致车站结构顶层的最大层间位移角大于底层的最大层间位移角。
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Abstract: As a key transportation infrastructure, the high-speed railway hub station is of great significance to ensure its seismic safety. Taking the structure of Changde high-speed railway hub station as the research object, the representative strong earthquake records are selected as the seismic bedrock motion. Considering the engineering geological characteristics of the site, soil nonlinearity, and pile-soil dynamic interaction, the finite element method is used to analyze the nonlinear earthquake response of the three-dimensional system of the high-speed railway station structure. The results show that: the structural system of a high-speed railway hub station considering pile-soil interaction presents the characteristics of 'soft-upper-rigid-down' as a whole, and the natural frequency is lower than that of the station structural system with rigid foundation assumption; Under the action of three kinds of strong ground motions, the nonlinear seismic effect of the site is significant, the surface acceleration is significantly enlarged, and the acceleration and displacement response of the site soil gradually decreases with the increase of buried depth; The interaction between pile and soil is related to the nonlinear seismic effect of the site. Both of them deform together to resist the foundation deformation caused by strong ground motion, and the strength of the interaction between the two increases with the increase of the intensity of ground shaking; Among the three kinds of seismic waves, the predominant frequency of Kobe wave is the closest to the natural frequency of the station structure system, followed by El Centro wave; The existence of the roof structure leads to the gradual amplification of the seismic response of the station frame structure with height, and the seismic response amplification at the connection between the roof structure and the base frame structure is the largest. Therefore, the maximum inter-story displacement Angle of the top layer of the station structure is greater than that of the bottom layer. -
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