格构式塔架顺风向风振响应

Wind-induced Dynamic Responses in Along-wind Direction for Lattice Towers

基于高频底座测力天平风洞试验数据得到了格构式塔架顺风向一阶振型广义荷载均方根系数和广义荷载谱解析模型,并从修正线性振型广义荷载谱的角度推导了一阶振型广义荷载谱修正方法和高阶振型广义荷载谱表达式,进而利用推导得到的广义荷载谱,计算了3种典型格构式塔架气弹模型的顶部加速度均方根响应,通过将计算结果和气动弹性模型风洞试验数据对照,分析了振型修正对风振响应的影响和高阶振型、气动阻尼对风振响应的贡献,并得到了若干结论。

Based on high-frequency force balance technique in a boundary layer wind tunnel, the root mean square （RMS） coefficients of generalized force and the analytical model of the generalized force spectra of the first mode of typical lattice towers in along-wind direction were proposed. And the generalized force spectra were deduced trom deriving the method ol the l^rst mode and generalized torce spectra ot higher modes by mode shape corrections of generalized force spectra. The top RMS acceleration responses in aeroelastic model of three typical lattice towers were evaluated by using the generalized force spectra. And compared with experimental data of wind tunnel, the influence of mode shape corrections and the contributions of higher modes and aerodynamic damping on wind-induced dynamic responses were analyzed and several conclusions were drawn.