考虑结构极限状态的输电塔-线体系风洞试验研究  

STUDY ON COLLAPSE STATES OF TRANSMISSION TOWERS BY WIND-TUNNEL TESTS OF TOWER-LINE SYSTEMS

作　　者：刘石 杨毅 黄正 高庆水 张楚 李正良[3] 汪之松[3] LIU Shi;YANG Yi;HUANG Zheng;GAO Qingshui;ZHANG Chu;LI Zhengliang;WANG Zhisong(Electric Power Research Institute of Guangdong Power Grid Co.,Ltd.,Guangzhou 510080,China;Guangdong Diankeyuan Energy Technology Co.,Ltd.,Guangzhou 510080,China;School of Civil Engineering,Chongqing University,Chongqing 400045,China)

机构地区：[1]广东电网有限责任公司电力科学研究院,广州510080 [2]广东电科院能源技术有限责任公司,广州510080 [3]重庆大学土木工程学院,重庆400045

出　　处：《工业建筑》2020年第10期145-151,共7页Industrial Construction

基　　金：中国南方电网有限责任公司科技专项(GDKJQQ20153007)。

摘　　要：为研究输电塔-线体系的耦合效应,探索塔-线体系极限状态的失效模式和破坏机理,以广东省某220 kV输电塔-线体系为研究对象,研制考虑结构极限状态的输电塔气动弹性试验模型,通过风动试验,再现了输电塔-线体系极限风荷载下的倒塌现象,并与有限元法分析结果进行了对比分析。研究表明:1)基于稳定应力等效设计的输电塔极限状态气动弹性模型能够较好地在风洞试验中模拟出结构的破坏情况;2)强风作用时,塔-线体系的耦合振动使塔-线体系的振动比相同环境中单塔的振动更为复杂,破坏可能与发生强非线性振动、局部响应扩大有关,结构杆件发生失稳破坏;3)在输电塔结构设计时,应加强塔身中部沿垂直于导线走向方向的稳定承载力,不可忽视横风向风振响应的贡献。In order to study the coupling mechanism of transmission tower-line systems and explore failure modes and mechanisms of ultimate states,an aeroelastic model of transmission tower-line systems considering ultimate states was designed based on a 220 kV transmission tower-line system in Guangdong province.The wind tunnel tests of a single tower and a tow-line system in the turbulent wind field were carried out,and the phenomenon of tower collapese under the ultimate wind load of transmission tower-line systems was reappeared.The comparisons of the results between the finite element analysis and the tests showd that:1)Based on the equivalent design of stable stress,the model of the transmission tower under ultimate states could be simulated the structive failure well in the wind tunnel test.2)In the case of strong wind,the coupling vibration caused by the tower line system made vibration caused by the tower-line system made vibration of the tower-line system more complicated than that of a single tower in the same environment.The failure might be related to the occurrence of nonlinear internal resonances and local responses to be amplified,and the elastic-plastic instability failure would occured.3)designing of transmission tower structure,the stable bearing capacity of the middle of the tower along the direction perpendicular to the conductor direction should be strengthened,and the contribution of the across-wind vibration response should not be ignored.

关 键 词：输电塔-线体系 风洞试验 气动弹性模型 极限状态 非线性振动 

分 类 号：TM75[电气工程—电力系统及自动化]