頻率相差超過30%後扭轉耦合現象即不明顯。而在頻率比為1. 0且具3~10% 的偏心距
時，橫風向位移反應放大50% '順風向反應更達三倍之多。 I .Graduate student. Institute of Water Resource and Environmental Engineering, Tamkang Universit)'. Taipei
Hsi, Taiwan, R.O.C.
2.Professor, Department of Ci\·i\ Engineering. Tamkang University, Taipei Hsi, Taiwan, R.O.c.
The dynamic response due to wind loads of a square shaped high-rise building with aspect
ratio of four were studied to determined the coupling effects of torsional and lateral motions.
The alongwind, acrosswind and torsional wind loads were taken simultaneously in a wind
tunnel high frequency force balance measurement. Results indicate that the ratio between
torsional and lateral natural frequencies of the building played an important role: frequency
difference excess of 30% could suppress the coupling effect efficiently. However, for the case
of frequency ratio equal to one, three to ten percentage of eccentricity in eitherfboth axes,
would cause an increase of acrosswind response by nearly 50%, and more then triple the
中華民國第二屆結構工程研討會暨國科會工程處結構工程專題研究成果研討會論文集(二)=Proceedings of the second National Conference on Structural Engineering，頁505-514