针对我国古建筑的维修及保护，需了解、把握其结构动力特性。在不损伤古建结构性能条件下获得结构动力响应数据，利用自然环境激励对纯木古建筑飞云楼进行动力测试。用随机减量技术（RDT）改进随机子空间识别（SSI）法精度，并用改进的SSI分析飞云楼动力响应数据，获得结构自振频率、阻尼等模态参数，所得动力特性参数能为保护该古建筑提供借鉴依据。%ChineseancientarchitectureisasignificantembranchmentofChinesecivilization,whoseexquisite construction technology and unique architectural aesthetic value has made profound influence on ancient buildings in surrounding countries.The protection of wooden architectures,the most Chinese style building,because of its long civilized history and extensive distribution is becoming more and more urgent accompanying the passing of time. Understanding and grasping the structural dynamic characteristics of the building has great significance to its maintenance and protection.In order to collect dynamic response data under the condition of no damage to structural performance of the tested ancient architecture,the dynamic tests on the pure wood structural building of Feiyun pavilion which is a representative sample of Chinese ancient wood structure were carried out employing environment excitation.Modal parameters such as natural frequencies,and modal damping ratios were solved by the Stochastic Subspace Identification (SSI)method combined with the Random Decrement Technique (RDT).The results offer references to the protection of this ancient building.
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