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A STUDY ON DYNAMIC CHARACTERISTICS OF TRADITIONAL WOODEN BUILDING

传统木结构建筑的动力特性研究

基本信息

批准号：
10650584
负责人：
UCHIDA Akito
金额：
$ 1.86万
依托单位：
Nara National Research Institute for Cultural Properties
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
1998
资助国家：
日本
起止时间：
1998 至 1999
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-10650584/
关键词：
MICRO TREMOR MEASUREMENT NATURAL FREQUENCY DIAGNOSIS METHOD FOR SESMIC PERFORMANCE VIBRATION MODE DAMPING FACTOR

项目摘要

As the traditional timber buildinds are generally valuable cultural properties, we usually have to employ the non destructive examination philosophy to understand their dynamic characteristics. Micro tremor measurement is a method of measuring the continuous micro vibration of the buildings whose amplitude is from 1/1000 mm to 1/100 mm with high sensitive sensors. This method is satisfactorily applicable as it is not to damage or swing the buildings and it is easy to place the sensors on the beam or floor during the measurement.To clarify the dynamic characteristics of Japanese traditional timber buildings, micro tremor measurement were performed on nine buildings. By FFT analysis on the record of micro tremor, we obtained natural frequencies , damping factors and vibration modes of each building. Next, the lateral load- displacement relationships of five buildings among them were estimated, considering column rocking resistance and the effect of clay walls. And the values of natural frequency for parallel mode vibration were obtained using calculated values of initial stiffness and the estimated values of mass. Finally , the calculated values of natural frequency were compared with those observed in micro tremor measurements. The comparison showed an adequate correlation between the calculated values and the observed values of natural frequency, though the absolute values by calculation were lower than those observed. Therefore, micro tremor measurement seems to be applicable as one method in non-destructive diagnosis for seismic performance of.Japanese traditional timber buildings.

由于传统木结构建筑一般都是有价值的文化财产，因此我们通常必须采用无损检测的方法来了解其动态特性。地脉动测量是用高灵敏度传感器测量建筑物在1/1000 ~ 1/100 mm范围内的连续微振动的一种方法。该方法不会损坏建筑物或使建筑物摇摆，并且测量过程中易于将传感器放置在梁或地板上，因此具有良好的适用性。为了阐明日本传统木结构建筑的动力特性，对9座建筑物进行了微动测量。通过对地震动记录的FFT分析，得到了各建筑物的自振频率、阻尼因子和振型。其次，考虑柱的抗摇能力和粘土墙的影响，对其中5栋建筑的荷载-位移关系进行了估算。由初始刚度的计算值和质量的估算值得到了并联模态振动的固有频率。最后，将计算的固有频率值与实测结果进行了比较。结果表明，虽然计算的固有频率绝对值低于实测值，但两者之间有较好的相关性。因此，微动测量似乎是适用于作为一种方法，在无损诊断的日本传统木结构建筑的抗震性能。