摘要
为了研究输电塔-线体系的风致动力稳定,本文结合增量动力分析法和弧长法有限元分析了安徽某输电塔-导地线结构的风致动力响应,通过杆塔顶侧移比、底层受压侧主材应力和导线挂线点反力、张力和振幅的变化规律分析了塔-线相互作用及结构动力失稳前、后的受力特征。根据非线性静力与动力失稳塔顶侧移比相等原则得到了不水平档距塔-线结构动力失稳临界平均风速。结果表明:塔-线结构动力失稳过程主要为杆塔挂线点杆件屈服、塔身底部受压侧主材屈服、塔顶侧移比增大、塔底主材压屈;随着水平档距增加,塔顶侧移比增大,挂线点反力增大,导地线张力减小,导地线振幅增大,动力失稳临界平均风速减小;输电塔的风致稳定性设计应考虑动力效应及塔-线相互作用的影响。
In order to analyze the dynamic stability of transmission tower-line system,some transmission tower-line systems in Anhui under wind load was studied utilizing incremental dynamic analysis combining with arc length method.To reveal the pre-and post-instability behaviors of transmission tower-line,the developments of top drift ratio,Mises stress of bottom structural elements,hanging reaction forces,tensions and amplitudes of conductors were investigated.The critical wind speeds of dynamic instability of various span length transmission tower were captured by the principle of equal top drift ratio of tower.The results indicate that the process of dynamic instability of transmission tower include the plastic developing of wire hanging position,column yielding and top drift ratio increasing.Increasing the span length increases the top drift ratio,the hanging reaction force,the amplitude of conductor,and decreases conductor tension and the critical wind speed of tower.The influences of dynamic responses and interactions between tower and wires on the instability of transmission tower should be taken into account in the design.
作者
凌晓斌
杜伟
周转
高玄
齐益
赵宝成
LING Xiao-bin;DU Wei;ZHOU Zhuan;GAO Xuan;QI Yi;ZHAO Bao-cheng(State Grid Huangshan Power Supply Co., Ltd., Huangshan 245000, China;Anhui Huadian Engineering Consulting and Design Co., Ltd., Hefei 230061, China;School of Civil Engineering, Suzhou University of Science and Technology, Suzhou 215011, China)
出处
《科学技术与工程》
北大核心
2022年第8期3134-3143,共10页
Science Technology and Engineering
基金
国家自然科学基金(52008283)
江苏省建设系统科技项目(2019ZD009)。
关键词
输电塔线体系
动力失稳
风荷载
增量动力分析法
transmission tower-line system
dynamic instability
wind load
incremental dynamic analysis
