Study on measurement for impact waves in the earthquake and seismic design methods

地震冲击波测量及抗震设计方法研究

• 批准号: 14550482
• 负责人: SHIOI Yukitake
• 金额: $ 1.28万
• 依托单位: Hachinohe Institute 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: 2002
• 资助国家: 日本
• 起止时间: 2002 至 2004
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-14550482/
• 关键词: Impact wave; Seismic wave; Vertical wave; Wide range seismograph; Earthquake; Dropping test; Reinforced concrete filled concrete; Acceleration; 極短周期波動; 地震波; 耐震設計

Since the high-cycle seismic waves with very large acceleration have influence as the results of investigation on severe damage by earthquakes, we started to develop a wide-range seismograph able to measure higher cycle waves than the standard seismograph. We used piezo register type piezo electric elements for the sensor and succeeded to complete an aimed three-component seismograph with extent of cycle up to 500Hz and sampling interval of 2kHz. Because the first one was too sensitive to maintain, the vertical component was selected for the object of measurement considering the situation of damage. Consequently, the seismograph became stable and was installed in some buildings at Tsukuba City.In 2004 to 2005, the seismographs installed at Tsukuba recorded accelerations of middle sized earthquakes on 6 and 23 October, 2004 and on 16 February, 2005 and proved the high cycle waves of 50-500Hz in earthquake. The seismograph of SMAC type installed at the same place recorded waves until 50 Hz and the values of acceleration was about three times of the high cycle waves. The performance of seismographs may be examined in the range of high frequency. On other hand, fabricate of a seismograph able to record the higher cycle waves than 500Hz is easily possible.Since we could not gain the large accelerations expected, we performed a series of dropping tests of steel blocks at a distance of 30 cm. The blocks of 5 and 10 kg fallen from a height of 15 cm generated the accelerations of about 300 gal. These values are large enough to suggest the existence of excessive acceleration with the high frequency.We confirmed trough a series of loading tests that the structural members such ductile as a reinforced concrete filled tube (RCFT) are effective for these excessive acceleration in the earthquakes.

由于具有非常大的加速度的高周期地震波对地震严重破坏的调查结果有影响，我们开始开发能够测量比标准地震仪更高周期波的宽范围地震仪。传感器采用压电记录器式压电元件，成功地完成了周期幅值达500 Hz、采样间隔为2kHz的三分量地震仪。由于第一种方法过于敏感，不易维护，因此考虑到损伤情况，选择了垂直分量作为测量对象。2004年至2005年，筑波地震仪记录到了2004年10月6日和23日以及2005年2月16日的中等地震加速度，证实了地震中存在50- 500 Hz的高周波。安装在同一地点的SMAC型地震仪记录到50 Hz的波，加速度值约为高周波的3倍。地震仪的性能可以在高频范围内检验。另一方面，制造一台能够记录500 Hz以上的高周波的地震仪是很容易的。由于我们无法获得预期的大加速度，我们在30 cm处进行了一系列的钢块跌落试验。从15 cm高度落下的5和10 kg的块产生约300 gal的加速度。通过一系列的荷载试验，我们证实了在地震作用下，钢筋混凝土空心管（RCFT）等延性构件对这些过大的加速度是有效的。

项目成果

鉄筋コンクリート構造の靱性向上とせん断補強方法

提高钢筋混凝土结构韧性和抗剪加固方法

• 发表时间: 2004
• 期刊: 三陸はるか沖地震10周年記念シンポジウム論文集
• 作者: 塩井 幸武

Improvement of ductility of reinforce concrete and Reinforcing methods for shear force (in Japanese)

提高钢筋混凝土的延性和抗剪力的加固方法（日语）

• 发表时间: 2004
• 期刊: Proceedings of 10 Years Anniversary Symposium of 1994 Far-Off Sanriku Earthquake
• 作者: 塩井 幸武;塩井 幸武;塩井 幸武;Yukitake SHIOI;Yukitake SHIOI;Yukitake SHIOI
• 通讯作者: Yukitake SHIOI

xistence of impact waves in earthquakes and Development of a wide range seismograph (in Japanese)

地震中冲击波的存在和大范围地震仪的开发（日语）

• 发表时间: 2004
• 期刊: Proceedings of 10 Years Anniversary Symposium of 1994 Far-Off Sanriku Earthquake
• 作者: 塩井 幸武;塩井 幸武;塩井 幸武;Yukitake SHIOI;Yukitake SHIOI
• 通讯作者: Yukitake SHIOI

Influence of impact on base course and sub-grade by circulation

循环对基层和路基的影响

• 发表时间: 2005
• 期刊: International Conference on Geotechnical and Foundation Engineering, TC-3 Workshop
• 作者: 泉谷恭男;Y.Izutani;泉谷恭男;Y.Izutani;Y.Izutani;Y.Izutani;塩井 幸武
• 通讯作者: 塩井 幸武

鉄筋コンクリート充填鋼管(RCFT)の力学的特性

钢管钢筋混凝土力学性能（RCFT）

• 发表时间: 2004
• 期刊: 三陸はるか沖地震10周年記念シンポジウム論文集
• 作者: 塩井 幸武;塩井 幸武
• 通讯作者: 塩井 幸武