摘要
建立了覆冰荷载作用下寻找输电铁塔主要失效模式的方法,该方法以覆冰厚度为控制量,可以方便地获得铁塔的主要失效模式及其相应的极限覆冰厚度。分析了南方某既有输电线路铁塔在两种工况下的主要失效模式,指出该类铁塔的薄弱处位于挂导线处、上曲臂以及塔身上部。同时指出如果存在20%不平衡纵向张力,挂导线处及上曲臂的极限覆冰厚度接近于该铁塔的设计覆冰厚度,塔的安全储备不足。铁塔的失效模式分析的结果与实际倒塔情况相吻合。
A method controlled by ice thickness was introduced to generate dominant failure modes of a transmission tower.In two conditions,dominant failure modes of a broken down transmission tower in southern China were gotten.The examples showed that th is kind of tower had three weakparts： points of hanging lines,upside braces and upside tower body,and the limit ice thickness of points of hanging lines And upside braces were very close to the designed ice thickness of the tower if 20% unbalance tension existed.The numerical results of failure modes analysis were consistent with the conclusion given by the accident investigation report.
出处
《计算力学学报》
EI
CAS
CSCD
北大核心
2011年第3期468-472,478,共6页
Chinese Journal of Computational Mechanics
基金
国家自然科学基金(51078296)资助项目
关键词
失效模式
输电铁塔
覆冰荷载
极限荷载
倒塔
failure modes
transmission tower
ice load
limit load
tower collapses
