Empirical formula for fundamental vibration periods of reinforced concrete buildings in Taiwan
✍ Scribed by Hong, Li-Ling; Hwang, Woei-Luen
- Publisher
- John Wiley and Sons
- Year
- 2000
- Tongue
- English
- Weight
- 112 KB
- Volume
- 29
- Category
- Article
- ISSN
- 0098-8847
No coin nor oath required. For personal study only.
✦ Synopsis
More than 30 buildings around Taiwan have been selected to monitor the #oor responses under seismic excitation. The structural array monitoring system in each building controls at most 27 channels of accelerometers distributed in several #oors. Those buildings were triggered by many events during the past "ve years of operation. In each building, the records at the basement can be considered as the ground excitation, and the others at the upper #oors are the structural responses. The frequency transfer functions of those buildings can be identi"ed by ARX models, and then the fundamental vibration periods are estimated. The identi"ed fundamental vibration periods using di!erent events are compared in order to ensure the reliability of system identi"cation. An empirical formula in predicting the fundamental vibration period is presented through the regression analysis to the identi"ed fundamental vibration periods of 21 reinforced concrete (RC) moment-resisting frame (MRF) buildings. It is found that the height of a building plays an important role in predicting the fundamental vibration period, compared with the length, width, and time after completion of the building. It is also found that the RC MRF buildings in Taiwan tend to be sti!er than those in the U.S.