以下为句子列表：
英文: The article calculates the free-shake character of large-span cantilever truss by the repeatedly substitution method of sub-space, and analyzes the regularity of frequency and shake-type about the structure, at the same time, the actual calculating method
中文: 摘要用子空间迭代法计算了大跨度悬臂桁架的自由振动特性，并分析研究了此类结构的频率和振型规律，给出其在竖向地震力作用下的实用计算方法。
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