Research concerning the seismic damage decrease of the traditional wooden building and the cultural asset enshrined there.

传统木结构建筑及其所珍藏的文化财产的抗震减害研究。

• 批准号: 15500671
• 负责人: HATTORI Hideto
• 金额: $ 0.7万
• 依托单位: NAGANO NATIONAL COLLEGE OF TECHNOLOGY
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 2003
• 资助国家: 日本
• 起止时间: 2003 至 2004
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-15500671/
• 关键词: Characteristics of vibration; Traditional wooden building; Microtremor; Natural frequency; Damping constant; 減衰特性; 文化財; 地震被害; 振動測定

We researched concerning the seismic damage decrease of the traditional wooden building and the cultural asset enshrined there. Experimented buildings are the three-storied wooden pagoda in Miyota town in Nagano Prefecture and the main temple of Shogenji in Nagano City. About the seismic damage decrease of the cultural asset, study results concerning the seismic isolator in the past were examined. The vibration characteristic before it repaired and after it had repaired was examined along with the repair of the three-storied pagoda. The microtremor was observed for about 30 minutes. Moreover, the resonance experiment by the human strength excitation was done according to the first natural frequency that had been obtained from the microtremor. As a result, natural frequency was 1.5Hz, 2.3Hz, 3.7Hz before it repaired and after it had repaired respectively. The damping constant was about 0.03. The mode of vibrations were obtained up to third modes. The first mode showed bending deformation, and the second mode showed shearing deformation. The vibration measurement was done while repairing before it repaired along with the repair of the main temple of Shogenji that existed in Nagano City. As for the measurement after it repairs, it is scheduled to do after the repair is completed. The microtremor was observed for 30 minutes as well as the case of true easy temple Three-Storied Pagoda. And, the resonance experiment by the human strength excitation matched to the first natural frequency was conducted. As a result, the first natural frequency was 1.35Hz before it repaired and was 1.45Hz under the repair. The damping constant were 0.026 and 0.027 respectively. About the seismic damage decrease of the cultural asset, study results concerning the seismic isolator in the past were examined. It has been understood that response acceleration decrease about 1/12 against the revised earthquake wave of JMA Kobe NS, adjusting to 50 kine as the maximum velocity value.

对传统木结构建筑的震害减损和其中所蕴藏的文化资产进行研究。实验建筑是长野县宫田镇的三层木塔和长野市申根寺的主庙。关于减少文化资产的震害，回顾了过去关于隔震器的研究成果。结合三层塔的修复，对修复前和修复后的振动特性进行了分析。微震观察了大约30分钟。根据从微震获得的第一阶固有频率，进行了人体强度激励下的共振实验。结果表明，修复前、修复后的固有频率分别为1.5、2.3、3.7 Hz。其阻尼常数约为0.03。获得了高达3阶的振动模式。第一种模式表现为弯曲变形，第二种模式表现为剪切变形。振动测量是在修复之前进行的，修复前是与长野市现存的申根寺主庙一起修复的。至于修复后的测量，按计划在修复完成后进行。对微震进行了30分钟的观测，并对真易寺三层塔进行了观测。并进行了与第一阶固有频率匹配的人体强度激励的共振实验。结果表明，修复前第一阶固有频率为1.35 Hz，修复后为1.45 Hz。其阻尼常数分别为0.026和0.027。关于减少文化资产的震害，回顾了过去关于隔震器的研究成果。据了解，与JMA Kobe NS的修订地震波相比，响应加速度降低了约1/12，调整为最大速度值为50 kine。