摘要
台风有风速大、湍流强且风向不断变化的特点,可能导致转角塔承受不合理的不平衡张力,甚至造成结构破坏.以2014年台风“威马逊”为背景,利用YanMeng风场并结合谐波叠加法,模拟台风登陆时海南电网宝邑Ⅱ线位置处的脉动风速以及登陆过程风向的变化.首先通过理论分析研究线路转角和风向对转角塔受力的影响;随后建立转角塔线体系有限元模型,通过对模型施加模拟所得脉动风荷载以及不同方向台风静态荷载,研究台风脉动特性以及风向变化特点对转角塔受力的影响.结果表明:输电线路逆风向转角会减小转角塔整体受力,在90°风向台风作用下,逆风向15°转角塔线体系中转角塔主材轴力极值为-521.6kN,为对应顺风向15°转角塔主材轴力极值的56.8%;台风风向与线路转角间关系对转角塔主材受力有显著影响,在全方向台风作用下,顺风向15°转角线路中转角塔主材轴力最大值均大于逆风向15°转角线路中相应轴力最大值,且相对百分比最大可达399.9%.
Strong wind speed,turbulence and constantly changing wind direction characterize typhoon,which may lead to the unbalanced tension in conductors and even cause the structural damage of angle towers.In this paper,both the fluctuating wind speed and the change of wind direction of typhoon “Rammasun” at the position of Baoyi Ⅱ line of Hainan Power Grid during landing process were simulated by using YanMeng typhoon wind field combined with harmonic superposition method.After this,the influence of angle in transmission line and wind direction on the internal force of the angle tower was studied through the theoretical analysis.Then the finite element model of the tower-line system with angle was established to research the specific influence of the typhoon fluctuating wind speed and the variation of wind direction on the internal force of the angle towers.The results show that,under 90° direction wind load,the extreme axial force of angle towers in transmission lines with 15° upwind angle is calculated to be -521.6 kN,56.8% of the maximum axial force of that with 15° downwind angle.Meanwhile,under the action of typhoon static load in all directions,the maximum axial force of leg members of the angle tower in the transmission lines with 15° downwind angle is greater than the corresponding maximum axial force value of that with 15° upwind angle,and the maximum relative percentage is 399.9%.
作者
葛永庆
吴炅
安利强
王璋奇
GE Yongqing;WU Jiong;AN Liqiang;WANG Zhangqi(Department of Mechanical Engineering,North China Electric Power University,Baoding 071003,Hebei,China)
出处
《中国工程机械学报》
北大核心
2019年第3期189-195,共7页
Chinese Journal of Construction Machinery
关键词
转角塔线体系
台风模拟
风荷载
风致响应
tower-line system with angle
simulation of typhoon
wind-induced response
