Analysis on Dynamic Interaction of Subway Station-soil-aboveground Frame Structure Under Inclined Incidence of SV Wave
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摘要: 地震作用下地铁车站和邻近建筑间的动力相互作用问题已引起许多学者的关注和重视，然而斜入射地震波作用下的相互作用分析研究较少，有关规律仍不明确。为此建立基于黏弹性人工边界的地铁车站-土-地表框架结构整体动力分析有限元模型，围绕入射角、地上与地下结构间距、场地类别等因素，采用频域刚度矩阵自由场地震响应分析方法获得任意角度斜入射SV波作用下地铁车站-土-地表框架结构动力响应规律。研究结果表明，地表框架结构的存在会显著增大车站中柱轴力幅值，当地表框架结构与车站紧邻时，中柱轴力放大幅度最大为730%，放大效应会改变轴力随入射角的变化规律，总体上使车站中柱轴力在SV波垂直入射和超临界角10°左右入射时均具有相当的幅值；地表框架结构对地铁车站层间位移角的影响与场地条件密切相关，在较硬的场地（Ⅱ类场地）中，车站层间位移角放大幅度最大为74%，在较软的场地（Ⅳ类场地）中，车站层间位移角缩小幅度最大为30%；地铁车站的存在对地表框架结构层间位移角具有放大作用，总体上地铁车站与地表框架结构的距离越近，放大作用越明显，地表框架结构层间位移角放大幅度最大为52%。建议将0°入射和超临界角10°左右入射工况作为地上或地下结构地震响应分析的不利工况。Abstract: Dynamic interaction between subway station structure and adjacent building under the action of earthquake has been given much attention. However, the analysis of interaction under oblique incident seismic wave is still lacking, and the relevant laws are not clear. In this paper, based on viscoelastic artificial boundary, finite element model of the whole dynamic system of subway station-soil-aboveground frame structure is established, free field seismic response analysis method by means of the frequency domain stiffness matrix is adopted to obtain the seismic input under the action of oblique incident SV wave at any angle, and dynamic response law of the subway station-soil-aboveground frame structure system is analyzed by taking the incidence angle, the space between the aboveground and underground structures, the site category into account. It is found that: (1) The existence of aboveground structure will significantly increase the axial force amplitude of central column of station structure, when the aboveground frame structure is close to the station structure, axial force amplitude of the central column can be increased by up to 7.3 times, and this increase effect will change the variation law of the axial force amplitude with the incident angle, generally, the axial force of central column of the station has a considerable amplitude when SV wave is vertically incident and when it is about 10° higher than the critical angle. (2) The influence of the aboveground frame structure on the story drift ratio of subway station is closely related to the site conditions, in hard site (class Ⅱ site), the story drift ratio of station is amplified by 74% at the highest, and in soft site (class Ⅳ site), the story drift ratio of station is reduced by 30% at the lowest. (3) The existence of subway station structure can amplify the story drift ratio of aboveground frame structure, generally, the closer the subway station is to the aboveground building, the more obvious the amplification effect is, and the story drift ratio of aboveground frame structure can be amplified by 52% at most. It is suggested that cases of 0° incidence and the supercritical angle incidence, which is about 10° higher than the critical angle, should be considered as the unfavorable condition for seismic response analysis of aboveground or underground structures.
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图 5 自由场地表中点加速度峰值随入射角变化曲线
Figure 5. Curve of peak acceleration of midpoint on the surface of free field varying with incident angle
图 6 Ⅱ类场地中地铁车站内力幅值随入射角变化曲线
Figure 6. Amplitudes of internal forces of subway station varying with incident angles in class Ⅱ site
图 7 Ⅲ类场地中地铁车站内力幅值随入射角变化曲线
Figure 7. Amplitudes of internal forces of subway station varying with incident angles in class Ⅲ site
图 8 Ⅳ类场地中地铁车站内力幅值随入射角变化曲线
Figure 8. Amplitudes of internal forces of subway station varying with incident angles in class Ⅳ site
图 9 El Centro波作用下车站层间位移角随入射角变化曲线
Figure 9. Variation curves of story drift ratio versus incident angle under El Centro wave
图 10 Kobe波作用下车站层间位移角随入射角变化曲线
Figure 10. Variation curves of story drift ratio versus incident angle under Kobe wave
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