The Feasibility Assessment of the Setup of Earthquake Early Warning System and Post-Earthquake Rapid Structural Health Diagnosis for a Real Building

• Main Authors: Chih-Lung Hsieh, 謝志龍
• Other Authors: Li-Hsien Chen
• Format: Others
• Language: zh-TW
• Published: 2019
• Online Access: http://ndltd.ncl.edu.tw/handle/5gp288

碩士 === 國立臺北科技大學 === 土木工程系土木與防災碩士班 === 107 === Earthquake in Taiwan has the inevitable fate of coexistence. We are facing the risk of major disaster that may caused by a serious earthquake at any time and it may also lead to a large number of casualties and property loss. In this research, we installed an economical disaster prevention system in a full-scale 10-story RC structure building in area1 of Taipei Basin to make the feasibility assessment of system identification for the earthquake early warning and the post-earthquake rapid structural health diagnosis. We set one seismometer on the ground and the top floor respectively. It can record earthquake information while release early warning and earthquake report immediately. This system is not only designed to start up passive protection from the earthquake disaster but also to take the initiative self-inspection for safety building. As earthquakes occur, this system will process earthquake prevention actions in three stages. The first stage, “Before earthquake”, when P wave has reached , there are few seconds of crucial time before S wave arrives. The early warning is issued to building occupants by linking to the seismic strong motion early warning system of CWB ( Central Weather Bureau, Taiwan). The second stage, “ During earthquake”, when earthquake causes the building structure shaking , the seismic monitoring system of On-Site type is able to detect it immediately and broadcast to community residents all information including seismic intensity and turn on the escape warning light automatically in order to avoid panic from earthquake and also prevent secondary disasters may be caused by escaping hastily. At the same time, the system is also recording the period of acceleration waveform of seismic responses from the structure. The third stage, “After earthquake”, called the usage of RSHD (Rapid Structure Health Diagnosis) system. This system contains three terms: (1) apply absolute acceleration-displacement diagram to calculate the Pseudo-stiffness (k/m) of structure. (2) utilize FFT ( Fast Fourier Transform) to count natural frequency of building. (3) evaluate the drift angle of whole building. Complete the health diagnosis of structure rapidly after an earthquake, for the purpose of avoiding a secondary damage from building collapse that may caused by householder do not aware of the previous damage and a following-up shake. Spending almost a year, we took a target building with ten floors that in area1 of Taipei Basin and gathered data of seismic intensity were above 1 for 33 records in total from July, 2017 to June, 2018 and make a feasibility assessment of system identification for the earthquake early warning and the post-earthquake rapid structural health diagnosis for a real building.