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• Main Authors: Ssu-ming Lin, 林思銘
• Other Authors: Huei-wen Chang
• Format: Others
• Language: zh-TW
• Published: 2010
• Online Access: http://ndltd.ncl.edu.tw/handle/99202694547745323201

碩士 === 國立中央大學 === 土木工程研究所 === 98 === Abstract Impact or shock will be applied to piers of viaduct while bullet trains pass through. The impact energy will be transmitted to the pile shaft and then transferred to the pile tip. A new vibration source will be formed in bearing layer, and spread the vibration waves to the surrounding area. The purpose of this study is to improve the pile foundation to reduce this kind of vibration. According to the previous studies, it is understood that a single spring shock absorber has an obvious improving effect, but the amount of dynamic displacement may exceed the determined value of designing code. Thus, this study used a hydraulic shock-absorber, installed on the head of pile to reduce the shock or vibration energy. The results of experiments shows that the pure spring vibration damper can achieve the best result of vibration suppression, but the maximum amount of dynamic displacement is 5.14mm, the value limited by the designing code. However, if the shock-absorber is filled with oil, the maximum dynamic displacement can be decreased to the value of 0.5mm. Especially for the shock-absorber filled with the machine oil (oil height=3.0cm), the peak acceleration at pile tip can be decreased from 1.75g to 0.50g, and the maximum dynamic displacement is only 0.224mm. Therefore, the hydraulic shock-absorber can achieve the purpose of reduceing vibration and keep the dynamic displacement within a small value. Keywords: pile of vibration suppression, hydraulic shock-absorber, shock wave, dynamic displacement