摘要
目前,对于超高层结构进行动力弹塑性分析时,大多采用刚性地基假定,并忽略土-结构相互作用的影响。为了研究土-结构相互作用对超高层结构的影响,建立精细化的土体-地下室-上部结构三维非线性有限元模型,并对一栋高度366 m超高层塔楼进行了罕遇地震动力弹塑性分析。首先根据工程场地条件进行了一维等效线性化分析,以获取土层的地震反应。然后,利用波动法解决了在三维土层地震波动输入的问题,并验证了所采用方法的准确性。计算结果表明:与刚性地基假定相比,考虑土-结构相互作用会增加塔楼的自振周期;在预估的罕遇地震作用下,考虑土-结构相互作用后,塔楼的整体地震反应减小;塔楼层间位移角在低区增大,在高区减小,高区最大层间位移角减小,呈现变形向底部转移的趋势;塔楼高区墙体损伤减轻,结构整体刚度退化程度减小,同时基底剪力和倾覆弯矩降低;塔楼巨柱个别位置的内力增大,忽略土-结构相互作用的影响可能会导致设计结果偏于不安全;所提出的方法能够全面考虑场地土的影响,较为真实地模拟超高层结构的地震响应。
In existing dynamic elasto-plastic analysis of supertall structures,rigid foundation assumptions are commonly adopted,neglecting the influence of soil-structure interaction.To investigate the effects of soil-structure interaction on supertall structures,a refined three-dimensional nonlinear finite element model of soil-foundation-superstructure was established and dynamic elastoplastic analysis of a 366m supertall tower in case of rare earthquakes was conducted.A one-dimensional equivalent linearization analysis based on the engineering site conditions was first conducted to capture the seismic response of the soil layers.Subsequently,the wave propagation method was utilized to resolve seismic wave input issues in the three-dimensional soil layers and then the accuracy of the adopted approach was validated.The results indicate that the natural period of the tower increases compared with the rigid foundation assumption when considering soil-structure interaction.Under the estimated rare seismic action,considering soil-structure interaction leads to a reduction in the overall seismic response of the tower.The inter-story drift angles of the tower increase in the lower zone and decrease in the higher zone,with the maximum inter-story drift angle in the higher zone decreasing,exhibiting a trend that the deformation transfers to the bottom.The damage to the walls in the higher zone of the tower is alleviated,and the overall degree of stiffness degradation in the structure is reduced.Additionally,the base shear and overturning moments decrease when soil-structure interaction is considered.Individual locations of the tower's mega-columns experience increased internal forces,highlighting the potential risk of neglecting the effects of soil-structure interaction.The proposed method comprehensively considers the influence of site soil,providing a more realistic simulation of the seismic response of supertall structures.
作者
潘玉华
王翠坤
时继瑞
陈才华
邱盛源
马明
崔明哲
董皓
PAN Yuhua;WANG Cuikun;SHI Jirui;CHEN Caihua;QIU Shengyuan;MA Ming;CUI Mingzhe;DONG Hao(CABR Technology Co.,Ltd,Beijing 100013,China;National Engineering Research of Building Technology,Beijing 100013,China)
出处
《建筑结构学报》
EI
CAS
CSCD
北大核心
2024年第6期25-38,共14页
Journal of Building Structures
基金
国家重点研发计划项目(2022YFC3801200)
中国建筑科学研究院有限公司科研项目(20220122330730017)
中建研科技股份有限公司科研项目(20221902970730032)。
关键词
超高层结构
土-结构相互作用
一维场地分析
黏弹性边界
弹塑性分析
supertall structure
soil-structure interaction
one-dimensional site response eanalysis
viscoelastic boundary
elasto-plastic analysis
