For semi-rigid models of the special structures,the fundamental frequencies in the directions of the principal axes of the models are still in or near the frequency range of wind load spectra.

• 对于频率不够高的半刚性模型,其一阶振型频率处于结构荷载谱频带以内,因而共振作用比较明显,对结构动力荷载的影响不可忽视。