A ClOsed-Form Approximation Analysis Of Near-fault Ground Motion Pulses

• Main Authors: Ming-Feng Liu, 劉銘峯
• Other Authors: none
• Format: Others
• Language: zh-TW
• Published: 2005
• Online Access: http://ndltd.ncl.edu.tw/handle/14475667699619622389

碩士 === 逢甲大學 === 土木及水利工程所 === 93 === In 1999, the devastaking Chi-Chi earthquake occurred in Taiwan and in that event, many strong earthquakes were recorded by the central weather Bureau of Taiwan. Among them are many near-fault earthquake data with long period and high acceleration in characteristics . By choosing some of these near-fault earthquake data which are less than 6 kilometers form the fault, and by using the three pulse types (type A,B,C) proposed by Makris and decaying sinusoidal pulse type proposed by A.K.Agrawal , this study has done the following research works. First, constructed the elastic response spectra-displacement, pseudo velocity and pseudo acceleration- of the choosen time history. Second, derived the closed-form solutions of response of SDOF systems to the approximate aforementioned 4 types of pulses representing the corresponding earthquake data. The response spectra were also obtained for those 4 types of pulses. After comparing the researched results, the following conclusions can be made. The ground motions are more like pulses if the records are taken more close to the fault. The displacement response spectra obtained by the approximate pulse are in good agreement with those obtained by the real time history simulation. Therefore the theory proposed by Makris & A.K.Agrawal are proven to be applicable to the near-fault earthquakes.