摘要
多回路输电塔由于质量与面积沿杆塔高度存在突变,按照规范公式求解风振系数将偏于危险。基于杆塔的集中质量模型,对输电塔风振系数的频域分析方法进行了探讨,推导了考虑背景响应的等效静力风荷载计算公式。通过比较阐明了多回路输电塔风振系数沿塔高的变化特点,分析了背景响应分量对风振系数的影响,并建议在进行多回路输电塔的抗风设计时,采用杆塔多阶振型的CQC组合计算等效风荷载。
The standard formula is inapplicable to solve the wind vibration coefficient because the area and mass of the multi-loop transmission towers are discontinuity along the height direction.The frequency domain analysis method of the wind vibration coefficient was discussed and the formula of the equivalent static wind load considering the background response had been deduced based on the lumped mass model of the tower.The features of the coefficient along the height were given and the influence of the background response was analyzed.The CQC combination of the multi-mode vectors was proposed to calculate the equivalent wind load in the wind resistance design of the multi-loop transmission towers.
出处
《建筑结构》
CSCD
北大核心
2011年第3期110-113,共4页
Building Structure
关键词
多回路输电塔
风振系数
等效静力风荷载
集中质量模型
multi-loop transmission tower
wind vibration coefficient
equivalent static wind load
lumped mass model
