摘要
传统输电线路抗震研究中,输电塔底部通常设置为固定约束,鲜少考虑土-结构相互作用(SSI)和沿土层深度变化地震动对输电塔-线体系的影响,导致无法准确评估其抗震性能。基于此,建立未考虑SSI、考虑SSI而忽略空间变化地震动、综合考虑SSI和沿土层深度变化地震动的输电塔-线体系有限元模型,采用增量动力分析(IDA)方法建立不同性能状态下的概率地震需求模型,随后开展输电塔-线体系易损性分析,以明确SSI和土层深度变化地震动对输电塔-线体系抗震性能的影响规律。结果表明:SSI显著增大了输电塔-线体系的地震响应,而忽略地震动的沿土层深度的空间变化效应会高估结构抗震性能,考虑土层深度变化地震动下,塔底桩体长度与抗震性能呈反比,文章强调了在输电塔-线体系抗震设计与分析中考虑SSI和土层深度变化地震动的必要性。
In traditional seismic studies of transmission lines,the tower base is typically modeled with fixed constraints,and the effects of soil-structure interaction(SSI)and varying ground motions along soil depth are rarely considered.This simplification leads to inaccurate seismic performance assessment.To address this problem,this work established three finite element models of a transmission tower-line system(ignoring SSI,considering SSI but ignoring varying ground motions along soil depth,and comprehensively considering SSI and varying ground motions).Incremental dynamic analysis was employed to develop probabilistic seismic demand models for different performance states.Fragility analysis was also performed to clarify the impacts of SSI and varying ground motions on the seismic response of the transmission tower-line system.Results demonstrate the following:(1)SSI notably amplifies the seismic response of the tower-line system.(2)Ignoring the spatial variation effect of ground motions along soil depth leads to an overestimation of structural seismic performance.(3)Under varying ground motions along soil depth,the pile length at the tower base is inversely proportional to the seismic performance.This study underscores the necessity of incorporating SSI and vertically varying ground motions in the seismic design and analysis of transmission tower-line systems.
作者
徐震
刘凯悦
张涛
张航
李大卫
刘士远
田利
XU Zhen;LIU Kaiyue;ZHANG Tao;ZHANG Hang;LI Dawei;LIU Shiyuan;TIAN Li(Inner Mongolia Ludian Mengyuan Power Engineering Co.,Ltd.,Hohhot 010041,Inner Mongolia,China;School of Civil Engineering,Shandong University,Ji'nan 250061,Shandong,China)
出处
《地震工程学报》
北大核心
2025年第6期1281-1291,共11页
China Earthquake Engineering Journal
基金
国家自然科学基金面上项目(52178489)。
关键词
输电塔-线体系
土-结构相互作用
土层深度变化地震动
易损性分析
transmission tower-line system
soil-structure interaction(SSI)
varying ground motions along soil depth
fragility analysis
