受風水平振動之舒適度評估

Evaluation of Human Comfort Criteria to Wind-Induced Horizontal Vibration

陳振堂(Jeng-Tang Chen)

指導教授 ： 吳重成

淡江大學/工學院/土木工程學系碩士班/碩士(2007年)

https://doi.org/10.6846/TKU.2007.00622

摘要

建築物在受風擾動下，除了安全性上受關注，其使用人員的舒適度在結構設計裡亦是一個重要的議題。對於建築物受風影響造成的振動，其舒適度規範的制定長久以來一直備受爭議，除了身體因素之外，還包括心理因素等眾多因素影響。最近台灣風力規範訂定之舒適度標準為5 mm/sec²加速度，其對應之回歸週期為半年。

為建立在地資料以作為未來風力規範改進之參考，本研究使用淡江大學風工程研究中心新建置之振動模擬台，建立一套方法學及流程，以求得舒適度門檻值與回歸週期；並具體執行簡諧振動之初步試驗與正式試驗，獲得調查資料，並據以建立舒適度規範(2%、5%與50%反對百分比)與對應之回歸週期。

由結果得知：(1)舒適度門檻值將隨不同振動頻率而改變(0~1Hz)；(2)處於前後振動方向較處於左右振動方向敏感。然而，依據本論文之方法求得之回歸週期並無法合理地隨反對百分比增加而增長。此乃因為假設包松分配並不隨振動情況之不同而變，未來之研究將對此做適當修正，使回歸週期之決定更合理。

關鍵字

風致振動 ； 舒適度標準 ； 回歸週期 ； 振動模擬台 ； 包生分布

並列摘要

Under wind disturbance, the comfort of occupants in buildings is an important issue in the structural design aside from safety consideration. The human comfort criterion for wind-induced motion has been a long-time controversial issue because many factors, either physiological or psychological, can considerably differentiate the outcome. Recently, a constant criterion of 5 cm/sec2 for a half-year return period was regulated in Taiwan building wind code.
In an attempt to build up the local data base in preparation for improving the building wind code in the future, this research aims to conduct surveys to investigate the comfort criteria by using a motion simulator newly constructed at the wind engineering research center, Tamkang University. A methodology and feasible procedure to determine the comfort threshold and the return period were proposed in this study. Two surveys (one tentative and one formal) using harmonic motion have been performed to obtain the comfort thresholds for 2%, 10% and 50% of people objecting and their corresponding return periods.
The results show that (1) comfort thresholds are frequency-dependent within 0~1 Hz; (2) people with body orientation in fore-aft direction are more senitive to vibration than in side-to-side direction. However, it is found that, following the methodology proposed, the return period obtained does not reasonably increase with percentage of people objecting. It is due to the assumption of the same Poisson distribution for each vibration case in the methodology, which is to be improved in the future consecutive studies.

並列關鍵字

Wind-Induced Motion ； Comfort Criteria ； Return Period ； Motion Simulator ； Poisson Distribution

參考文獻

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15. W. H. Melbourne and J.C.J. Cheung (1988), “Designing for Serviceable Accelerations in Tall Buildings”, Proceedings of 4th International Conference on Tall Buildings, Hong Kong and Shanghai, pp. 148-155.