格构式塔架动力风荷载解析模型

Analytical Model of Dynamic Wind Loads on Lattice Towers

摘要:

基于高频底座天平测力风洞试验, 得到了三种典型的格构式塔架的顺风向、横风向与扭转向一阶振型广义荷载谱与均方根广义力系数.在此基础上,利用最小二乘法拟合,建立了格构式塔架的一阶振型广义风荷载谱解析模型.该模型与风洞试验结果吻合较好,可在此基础上建立格构式塔架二维或三维动力响应的频域计算方法.

关键词:格构式塔架;风洞试验;广义风荷载谱;解析模型;格构式塔架;动力风荷载;解析模型;Lattice;Wind;Dynamic;Model;频域计算方法;三维动力响应;结果;风荷载谱;拟合;乘法;最小;利用;系数;广义力;均方根;扭转;横风向

Abstract:

Based on base balance technique in a boundary layer wind tunnel, the generalized force spectra and RMS coefficients of the first mode of three typical lattice towers in along-wind, across-wind as well as torsional directions were obtained. In light of these results, the analytical models of generalized force spectra of the first mode of the lattice towers were established by applying least-square method. These models are in good agreement with the experimental results obtain by wind tunnel tests, and a 2 -D or 3-D calculation method can be developed on the basis of the models to evaluate wind-induced dynamic responses of typical lattice towers in frequency domain.

Key words:lattice tower; wind tunnel test; generalized force spectrum; analytical model