格构式塔架顺风向风振响应简化计算

Simplified Evaluation of Along-wind Dynamic Responses of Lattice Towers

基于格构式塔架顺风向一阶广义荷载谱解析模型,提出了格构式塔架顺风向风振响应简化计算公式,这些简化公式将求格构式塔架顺风向风振响应的复杂积分变为简便的代数运算.分别应用简化公式和随机振动理论的频域积分计算求得了三种典型格构式塔架顶部位移和加速度均方根响应值,将简化公式计算结果与积分计算结果相比较,相对误差都在5%以内.因此,本文提出的简化公式有较高的精度.

Based on the analytical model of the generalized force spectra of the first mode of typical lattice towers in along-wind direction,simplified empirical formulae to evaluate along-wind dynamic responses of lattice towers under wind load are proposed in this paper.By using these formulae,along-wind dynamic responses of lattice towers can be conveniently evaluated by algebra operation instead of by complex integral calculus.The RMS displacement and acceleration responses at apexes of three typical lattice towers in along-wind direction are calculated by the simplified empirical formulae and integral calculus respectively,the error between them for all case are basically within 5%,thus the formulae proposed are fairly reliable.