透過您的圖書館登入
IP:52.90.227.42
  • 學位論文

探討有效受風面積對於雙斜式屋頂低矮建物局部風壓係數之影響

Investigation on area effects to local peak pressure coefficients of gable-roof low-rise building

指導教授 : 羅元隆
共同指導教授 : 張正興(Cheng-Hsin Chang)

摘要


根據美國最新規範ASCE7-16之修訂結果,風力係數及風壓係數皆有更加保守的趨勢,表示對於未來極端氣候的防範更為提升。我國風力規範所參考之ASCE7-88及ASCE7-02,距今已有十幾年差距,同時在第三章局部構材及外部被覆物之設計風壓係數其實為參考美國規範並乘上一個倍數而得,基於此,希望透過本研究之實驗以及計算來確立出一套能夠探討這部分的流程,並與規範進行初步的比對。 本研究之主要目的為探討低矮建物之局部風壓係數受有效受風面積之影響,在此藉由傳統的風洞物理模擬方法作為進行內容各部分的探討依據。首先在風壓係數部分,選擇數座具代表性的低矮建築物作為風洞試驗之模型,量取其表面風壓並分析成風壓係數,之後再進行面積加權之計算以探討有效面積之影響。同時將本研究中不同模型之實驗成果進行比較,最後將本研究所認為之最佳成果與規範進行初步的比較與討論。本研究分別於內政部建築研究所風雨風洞實驗室以及淡江大學風工程研究中心第一號大氣邊界層風洞實驗室進行縮尺模型的風壓量測實驗。將量測到之各模型表面動態分壓分布,利用參考風速壓來計算風壓係數。接著利用以甘保分布為基礎的極值分析估算出最佳極值風壓係數,並利用該設計值進行面積加權動作。 比較其結果可推測,將估算出之最佳極值風壓係數的結果進行面積加權後,比對本研究中不同模型之實驗成果並探討其面積效應之影響,同時與現今台灣建築耐風設計規範之第三章之內容進行初步之比較。透過以上的流程確立出與規範第三章局部構材及外部被覆物之設計風壓係數比對的一套流程,並希望以此作為判斷現今規範設計值保守與否之初步分析。

並列摘要


The main purpose of this study is to investigate the area effects on the local peak pressure coefficients of gable-roof low-rise buildings by using traditional wind tunnels of physical simulation. In the first stage, select several representative low-rise buildings as the model of wind tunnel test, then measure the wind pressure of the model’s surface, then analyze the wind pressure coefficient. In the second stage, calculate the weighted of the area to discuss the impact of area effects, and compare the results of the different models in this research. After the two stages, the results considered by this research are compared with the codes to show the main purpose of this research. The experiments are conducted at the wind tunnel of the Architecture and Building Research Institute, Ministry of the Interior, and the wind tunnel of Tamkang University, The measured dynamic partial pressure distribution on the surface of each model is used to calculate the wind pressure coefficient by using the reference pressure of the wind speed. Then analysis the extreme value of the pressure coefficient into extreme pressure coefficient by using Gumbel distribution, and conduct area weighting. Finally, compare the experimental results of different models in this study and discuss the effect of the impact of area effects, At the same time, contrast with the current code of Taiwan. And hope to use this as a preliminary analysis to judge whether the current code design values are conservative or not.

參考文獻


參考文獻
[1]American Society of Civil Engineers,(2012), “Wind tunnel testing for buildings and other structures (ASCE/SEI 49-12) ”, Structural Engineering Institute, American Society of Civil Engineers.
[2]內政部營建署,(2015),“建築物耐風設計規範及解說”,詹氏書局編輯部。
[3]羅元隆,陳瑞華,(2020),“國際耐風設計規範局部風壓係數之本土化擬合研究”,109年內政部建築研究所委託研究報告,內政部建築研究所。
[4]羅元隆,林逸崧,(2016),“低矮建物屋頂表面極值風壓之特性分布探討”,2016年全國風工程研討會論文。

延伸閱讀