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本文用能量法研究了横向加劲单曲悬索屋盖的动力特征,给出了屋盖结构自振频率的表达式,得到了关于这类结构动力特征方面的一些结论并给予了解释。注意到这类结构与一般结构的一个重要不同点是必须考虑振动过程中索内力的变化,从而揭示了这类结构基本振型为反对称振型的原因。通过一个具体的模型试验,将本文所提方法的计算结果与试验的实测结果作了比较,结果是令人满意的。
In this paper, the dynamic characteristics of the laterally stiffened single suspension cable roof are studied by the energy method. The expression of the natural vibration frequency of the roof structure is given. Some conclusions about the dynamic characteristics of this kind of structure are given and explained. It is noted that an important difference between this type of structure and the general structure is that it is necessary to take into account the changes in the internal forces of the cable during the vibration process, thus revealing the reason why the fundamental modes of such structures are anti-symmetric modes. Through a specific model test, the calculation results of the method proposed in this paper are compared with the actual test results. The results are satisfactory.