半圓柱形溫室風壓係數之實驗研究

Other Title
Experimental Study of Pressure Distribution on Semi-Circular Greenhouses
Journal
農業工程學報
Journal Volume
62
Journal Issue
3
Pages
63-73
Date Issued
2016-09
Date
2016-09
Author(s)
朱佳仁
林坦誼
劉明怡
Chia-Ren Chu
Tan-Yi Lin
Ming-I Liu
DOI
URI
Abstract
本研究使用風洞實驗研究半圓柱形隧道式溫室的風力負載，實驗入流流況為紊流邊界層流，在不同風向角下，利用高頻率的壓力掃描計量測單棟、二連棟與三連棟半圓柱溫室表面風壓的分佈及瞬間變化，再用甘保機率分佈計算極值風壓，並探討室外紊流強度與陣風因子的關係，以計算建築物的最大風載。研究結果發現：最大負壓皆發生在溫室頂部，風向角22.5°的最大負壓大於風向角0°時的最大負壓，且實驗量測得之溫室外牆的時間平均風壓係數符合「建築物耐風設計規範及解說」(2015)所建議的風壓係數，但耐風設計規範(2015)所建議之陣風因子偏小，無法承受瞬間發生的極值風壓，建議增大陣風因子。本研究之成果可提供半圓柱形溫室的耐風結構設計之用，亦有助於吾人對圓形物體上風壓分佈、分離點及極值風壓的瞭解。 This study uses wind tunnel experiments to investigate the pressure distribution and wind load of semi-circular greenhouses. The instantaneous pressures on the surface of the greenhouse are measured by a multi-channel pressure scanner under different wind directions and arrangements. The experimental results showed that when the time-averaged pressure coefficient of oblique wind (wind direction 22.5°) is larger than that of wind direction normal to the ridge line (wind direction 0°). In addition, the peak pressure is several times larger than the time-average pressure, and the gust effect factor suggested by the Wind Resistance Design Code of Taiwan is not sufficient to protect the semi-circular greenhouses against the peak pressure caused by the turbulent wind. The results of this study not only facilitate a better understanding of the peak pressure around circular-bodies, but also to provide the needed information for the structural design of the arch-roof greenhouses.
Subjects
溫室
半圓柱形屋頂
風壓係數
風力負載
風洞實驗
Greenhouse
Arch roof
Pressure coefficient
Wind load
Wind tunnel experiment
Publisher
社團法人台灣農業工程學會
Type
journal article
File(s)
Loading...
Thumbnail Image
Name

index.html

Size

22.13 KB

Format

HTML

Checksum

(MD5):9c3999c967f47619f5365cd30d046508