考虑土-结构相互作用的输电塔风振系数计算

Transmission Tower Wind Vibration Coefficients Calculation in Consideration of the Soil-Structure Interaction

研究运用ABAQUS软件分别建立I类场地土体条件下考虑土-结构相互作用(SSI)的整体有限元模型和基础固支的输电塔三维有限元模型,进行了输电塔结构动力特性分析,最后利用新旧荷载规范[1~2]分别计算考虑SSI和基础固支工况下输电塔的风振系数.结果表明:考虑SSI效应后输电塔自振周期增大,风振系数也有不同程度增大,新荷载规范计算得出的两种工况的风振系数均有非常显著地增大.研究认为,利用新荷载规范同时考虑SSI效应能更准确的计算结构风振系数.

In this research,ABAQUS was adopted to establish the finite element model separately for consider-ing soil-structure interaction （SSI） in class I site condition and foundation fixed support of transmission tower（3D）,and conducted a transmission tower modal analysis. finally,calculated transmission tower wind vibrationcoefficients of considering SSI and clamped condition by use of new and old load specifications. The resultsshowed that：After considering SSI effect,transmission tower vibration period increases,the wind load factoralso increased significantly under the new conditions of the two kinds of standardized load wind load factorshave improved significantly. In this research,Taking advantage of the new load specification and consideringPSSI effect can more accurately calculate the wind vibration coefficients.