摘要
运用ABAQUS软件分别建立四类场地土体条件下考虑桩-土-结构相互作用(简称PSSI)的整体有限元模型和基础固支的输电塔三维有限元模型,并通过在桩和土体交界面上设置主从接触面来考虑桩-土-结构相互作用效应,然后基于线性滤波法模拟输电塔结构脉动风,进行了输电塔结构模态分析和风振响应分析,最后计算输电塔的风振系数。结果表明:考虑PSSI效应后输电塔自振周期随土体柔度增大而增大,塔身主要节点位移最大增至2.8倍,主要控制点加速度与应力有不同程度的减小,Ⅰ类场地土体条件下风振系数有明显增大。研究认为,考虑PSSI效应可以更准确地分析输电塔的风振响应。
In this study,ABAQUS was used to build the integrated finite element model of considering pilesoil-structure interaction （PSSI） and the three-dimensional finite element model of foundation supported transmission tower in four types of site conditions separately, and the master-slave contact in the pile and soil interface was set to consider pile-soil-structure interaction. Then, simulating the fluctuating wind of transmission tower on the basis of linear filtering method, and conducting the analysis of modal response and wind vibration of transmission tower. Finally, the wind vibration coefficient of transmission tower was calculated. The results show that after considering the PSSI effect the natural vibration period of transmission tower increases with the soil flexibility, and the maximum nodal displacement of the tower is increased to 2.8 times. In addition, the acceleration and stress of the main control points have different degrees of reduction, and the wind vibration coefficient of I site soil conditions have significantly increased. Therefore, it is considered that the wind vibration response of the transmission tower can be more accurately analysed by taking into account the PSSI effect.
出处
《东北电力大学学报》
2016年第6期84-90,共7页
Journal of Northeast Electric Power University
基金
国家自然科学基金项目(51278091
50978049)
吉林省科技计划项目(20140429
20140519001JH)
关键词
输电塔
桩-土-结构相互作用
模态分析
风振响应
风振系数
Transmission tower
Pile-soil-structure interaction
Modal analysis
Wind vibration response analysis
Wind vibration coefficients
