摘要
输电线路一般位于空旷地带,遭遇地震作用时,一般同时承受风荷载,有必要对其地震-风耦合作用下的多灾害响应进行研究。采用ABAQUS分析软件,建立某输电塔-线体系有限元模型。基于Kaimal功率谱密度函数,采用谐波叠加法进行风场模拟,生成输电塔-先体系各加载点风荷载动力时程,用以计算输电塔结构风振响应。选取三组三维地震波,分别对输电塔-线体系进行罕遇地震作用、罕遇地震-风耦合作用下的响应分析,研究风速、耦合作用时间及风向对结构动力响应的影响。研究结果表明:风荷载对输电塔-线体系罕遇地震作用下响应的影响不容忽视,其风荷载影响系数随风速的增大呈增大趋势。风荷载与地震作用耦合时间影响多灾害峰值响应,当单独作用的极值响应(正负号相同)接近于同一时刻发生时,输电塔极值响应可明显增大。风向对输电塔-线体系多灾害响应影响显著,不同风向的风荷载可能增大也可能减小输电塔在罕遇地震作用下峰值响应。
Transmission lines are often located in open areas,and the wind is exist nearly all the year round.When an earthquake occur,a transmission line is subjected to earthquake action and wind load at the same time.Therefor,it is necessary to study the responses of transmission tower-line system under the coupling of earthquake and wind.The transmission tower-line system is establish by ABAQUS analysis software.And thedynamic time histories of wind load are calculated according to Kaimal power spectrum and harmonic superposition method.The structure responses of the transmission tower are obtained from the dynamic time histories of wind and three sets of seismic waves.The dynamic responses of transmission tower under the coupling of earthquake and wind are compared with that under earthquake only to study the influences of wind speeds,coupling-time and wind directions.The results show that the influence of wind load can not be neglected to calculate the responses of transmission tower under rarely occurred earthquakes,and the wind load influence factors increase with the increase of wind speeds.The maximum response under the coupling of earthquake and windare influenced by coupling-time because of that the response under wind is random.The responses of tower under multiple hazards are related to wind direction,and it not only can increase,but also can decrease with different wind directions.
作者
王文明
王冠惠
盛寒柯
高雅慧
吕晓
WANG Wenming;WANG Guanhui;SHENG Hanke;GAO Yahui;Lü Xiao(Department of Civil Engineering,Shandong Jianzhu university,Jinan 250101,China;Key Laboratory of Building Structural Retrofitting&Underground Space Engineering,Ministry of Education,Shandong Jianzhu University,Jinan 250101,China)
出处
《世界地震工程》
北大核心
2023年第3期165-173,共9页
World Earthquake Engineering
基金
国家自然科学基金项目(51908340)
山东省重点研发计划(2021CXGC011204)。
关键词
输电塔-线体系
地震作用
风荷载
多灾害
数值模拟
transmission tower-line system
earthquake action
wind load
multiple hazards
numerical simulation
