摘要
为研究下击暴流作用下输电塔结构的倒塌机理,在考虑输电塔结构的塔身主杆和腹杆的杆件失稳特征差异基础上,建立塔身主杆失稳的弯矩-轴力-轴向刚度关系曲面,并重现下击暴流强风作用下输电塔主杆受压弹塑性失稳破坏的全过程,得到输电塔在下击暴流强风荷载作用下倒塌时塔身斜腹杆和主杆失稳破坏的顺序。结果表明,在下击暴流强风作用下,输电塔在中上部和中下部的交接部位有大量塔身斜腹杆和少量塔身主杆相继发生失稳破坏,进而引起输电线塔结构整体倒塌。
In order to research the collapse mechanism of transmission tower under downburst strong wind, the moment-axial force-axial stiffness relationship of main chord members during buckling was proposed with considering the different buckling characteristics of chord and web members. Then, an elastic-plastic buckling analysis of transmission tower under downburst strong wind was accomplished. The whole elastic-plastic buckling collapse process of transmission tower was studied, and buckling damage order of chord and web
出处
《中国安全科学学报》
CAS
CSCD
北大核心
2014年第12期90-95,共6页
China Safety Science Journal
基金
国家自然科学基金资助(51308430
51438002)
教育部高等学校博士学科点专项科研基金新教师类资助课题(20110143120003)
道路桥梁与结构工程湖北省重点实验室(武汉理工大学)开放课题基金资助(DQJJ201310)
关键词
下击暴流
输电塔
弹塑性失稳
动力时程分析
倒塌
downburst
transmission tower
elastic-plastic buckling analysis
dynamic time-history analysis
collapse
