高烈度区双柱式大悬挑高架车站抗震设计  

SEISMIC DESIGN OF DOUBLE-COLUMN LARGE-CANTILEVER ELEVATED STATION IN AREA WITH HIGH SEISMIC INTENSITY

作　　者：董磊 范圣刚[2,3] DONG Lei;FAN Sheng-gang(Guangzhou Metro Design&Research Institute Co.,Ltd.,510010,Guangzhou,China;Key Laboratory of Concrete and Prestressed Concrete Structures of Ministry of Education,Southeast University,211189,Nanjing,China;School of Civil Engineering,Southeast University,210096,Nanjing,China)

机构地区：[1]广州地铁设计研究院股份有限公司,广州510010 [2]东南大学混凝土及预应力混凝土结构教育部重点实验室,南京211189 [3]东南大学土木工程学院,南京210096

出　　处：《建筑技术》2024年第22期2743-2748,共6页Architecture Technology

摘　　要：以8度区某双柱式大悬挑高架车站为例,进行了上部结构和桩基抗震分析。结果表明:结构在小震下满足规范的整体计算指标和位移要求,振型分解反应谱法计算结果可包络弹性时程分析结果;大震下结构关键构件基本无损伤,满足性能设计要求;竖向地震分析时,应选择底部轴力法和竖向振型分解反应谱法包络计算结果,且振型数目的增多对竖向振型分解反应谱法计算结果影响很小;对于墩柱,增加芯柱仅提高了其在高轴压比下的延性和承载力;对于地震作用下的桩基,提高承台侧面一定范围内回填土质量以及增加承台埋深,可有效降低桩基最大剪力和弯矩,尤其是弯矩;然而,桩顶固接会使最大弯矩集中在桩顶附近,增加了大震下桩基被破坏的风险。因此高烈度区双柱式大悬挑高架车站抗震设计分析具有一定的代表性,可为高烈度区类似工程提供参考。Taking a double-column large-cantilever station in a magnitude-VIII zone as an example,the seismic analysis was conducted to the superstructure and pile foundation.Results show that the structure subjected to minor earthquakes meet the requirements for the overall calculation index and displacement in standards,and the results of elastic time-history analysis are enveloped in those of calculation by the mode-superposition response spectrum method;key structural components are essentially undamaged and compliant with the performance design requirements in major earthquakes;the calculation results shall be enveloped by the bottom axial force method and vertical mode-superposition response spectrum method during the vertical seismic analysis,and the increase in vibration modes has little impact on the results of calculation by the vertical mode-superposition response spectrum method;the increase in core columns enhances the ductility and bearing capacity of piers at a high axial compression ratio;for pile foundations subjected to seismic actions,the maximum shear force and bending moment can be effectively reduced by improving the backfill quality within a certain range on the lateral side and increasing the buried depth of caps,and the bending moment is affected more;but the maximum bending moment is concentrated near the top of the pile subjected to rigid connection,which increases the likelihood of damage to the pile foundation in major earthquakes.Accordingly,the analysis on the seismic design of double-column large-cantilever elevated stations in areas with high seismic intensity is of representative significance,which can provide a reference for similar projects in areas with high seismic intensity.

关 键 词：高烈度 双柱式大悬挑 高架车站 抗震设计 桩基分析 

分 类 号：TU318[建筑科学—结构工程]