长短腿猫头直线塔的自振特性及静力分析

SELF-VIBRATION CHARACTERISTIC AND STATIC ANALYSIS OF LINEAR TOWERS WITH UNEQUAL LEGS

采用ANSYS和MATLAB软件,对长短腿猫头直线塔与等长腿猫头直线塔在大风工况下的静力和自振特性进行分析。自振特性分析表明:长短腿铁塔的塔腿高差对结构纵向和横向的前几阶振型影响很大。静力计算结果表明:背风面长腿塔柱轴力随塔腿高差的增大而减少,背风面短腿塔柱轴力随塔腿高差的增大而增大;纵向总位移随着塔腿高差的增大而减小,横向位移则相反;底部第一、第二横隔面斜杆对长短腿产生的支座高差非常敏感。

Compared with each other and based on finite element analysis with ANSYS and MATLAB, it is analyzed that the self-vibration characteristics and static forces of linear towers with different kinds of incremental legs under the largest wind load. The self-vibration characteristic analysis shows that the leg＇s increment of linear towers with unequal legs has a greater effect on the structural longitudinal and lateral vibration of the modes of the first few orders. The results of static analysis indicate that the axial force of the leeward tower bars which overlap the long leg＇s axial line descreases when the increments of leg increase , but the reaction of the axial force of the leeward tower bars which overlap the short leg＇s axial line is on the contrary; the structural longitudinal displacements descrease and the structural lateral displacements increase when the increments of leg increase ; the diagonals at the tower sections of the first and second orders are sensitive to the increments at the base that are aroused by the unequal legs.