330kV输电线路倒塔事故分析  

ANALYSIS OF COLLAPSE OF A 330 KILOVOLT TRANSMISSION LINE TOWER

作　　者：胡晓光[1] 崔智婕[2] 李清华[1] 韩军科[1] 李茂华[1] 杨靖波[3] 张子富[1] 朱彬荣[1] 王飞[1] 

机构地区：[1]中国电力科学研究院,北京100055 [2]航天材料及工艺研究所,北京100076 [3]电力规划设计总院,北京100120

出　　处：《工业建筑》2016年第8期50-55,共6页Industrial Construction

基　　金：国家电网公司科技项目

摘　　要：对陕北地区的某330 k V输电线路倒塔事故进行静力和动力计算,综合考虑设计标准、塔型、大风、微地形等多重因素,深入分析倒塔事故的原因。分析结果与铁塔的实际破坏情况一致,总结出铁塔倒塌破坏的主要原因是该线路采用的330 k V通用设计84A塔型是依据SDGJ 94—1990《架空送电线路杆塔结构设计技术规定》进行设计的,未对直线塔进行60°或45°计算,且其矩形塔身在承受顺线路方向风载的能力较弱。由于事故发生时,实际风速超设计风速21%,其风向角与线路方向成45°左右,线路事故段的局部地形对风荷载有放大效应,各种不利情况叠加造成杆塔结构超载受损。Static and dynamic analyses were made for a 330 kV transmission line in northern area of Shaanxi Province. The causes of the accident were analyzed by considering design code, tower type, strong wind, and micro- topography. Analysis and calculation results confirm to actual damage of the tower. It arrived at the conclusion that the principal reasons of the collapse of the transmission line towers were as follows ： 84A type tower did＇ t require to calculate suspend tower under 60° or 45° wind, according to Technical Code for the Design of Tower and Pole Structure of Overhead Transmission Line （SDGJ 94--1990） , and the capacity of 84A type tower of 330 kV general design was low when bearing wind load along line direction. The wind speed during the accident exceeded tower＇ s designed wind speed by 21%, and the wind angle was about 45°, and micro-topography magnified the wind load. All the said disadvantages made tower structure be overloaded and collapsed.

关 键 词：输电线路 大风 倒塔 事故分析 

分 类 号：TU391[建筑科学—结构工程] TU312.3