摘要
　　運用雨屏牆(Rainscreen wall)系統來做外牆改修，這樣的構法除了符合綠建築節省建築資源耗用以及減少營建廢棄物外，在台灣這種多颱風的氣候環境下，更可運用雨屏牆中空層作為等壓空間來達到減輕風壓之效果，提高外牆之安全性；此外經蒐集國內外牆改修應用雨屏牆之案例發現，由於國內對雨屏牆性能了解的不多，造成設計者對於雨屏牆之構法與材料選擇無所依據，所以許多關於雨屏牆的基礎研究及數據資料極需建立起來。本論文將探討所選定之參數對等壓性能之影響和運用等壓原理減輕風載之折減係數的參考資料以建立雨屏牆等壓性能之基本資料。

　　研究之進行，先透過文獻、案例與建材型錄之蒐集，對雨屏牆之構法與影響等壓效果參數之整理來確定研究範圍，並彙整文獻相關實驗方式與儀器設備，作為本論文擬定實驗計畫之參考；選定研究範圍為運用點支撐系統構法之雨屏牆，以不同雨屏透風孔幾何形狀，在不同風速情形下，改變透風開孔率、中空層容積來達等壓效果；選定實驗方式以較接近實際流場情況之風洞實驗來進行。

　　實驗之數據透過統計分析得到以下兩項研究成果：
一、雨屏背面與氣屏量測壓力之比較仍有些許差異（最大相差約20％，最小約5％），故建議未來進行相關研究時仍應將測點安裝於雨屏背面。

二、正面迎風且風速由8～19m/s時，條狀透風孔之等壓效果由96％下降至87％；圓形透風孔由90％下降至82％；開放式接縫則在85％～82％範圍間。其中以條狀透風孔之等壓效果為最佳。

三、正面迎風且風速為8～19m/s時，中空層容積之變化所影響之等壓效果最大約3％（83％～86％）；透風開孔率影響之等壓效果最大約7％（83％～90％）；孔徑大小最大約影響11％；故由改變中空層容積所獲得之等壓效果是較不明顯的。

　　最後再將本實驗分析數據對等壓原理減輕風載之折減係數建立一基礎資料參考表。

Abstract
　The construction that adopts rainscreen wall system for outer wall recladding not only conforms to the ideal of green building that reduces construction resource usage and construction waste, but also raises the safety of outer wall by using the cavity in rainscreen wall as pressure equalization space to reduce wind load which very well suits Taiwan’s climate that has many typhoons. In addition, through studying foreign/domestic cases of rainscreen wall application in outer wall recladding in Taiwan, it is found that designers have no rules to follow for the construction of rainscreen wall and choosing materials due to lack of understanding of rainscreen wall functions. Therefore it is of an urgent need to conduct fundamental researches on rainscreen wall and build relevant databases. By discussing the effect of selected parameters on pressure equalization performance and the reduction factor of applying pressure equalization to reduce wind load, this thesis intends to gather some basic data on the pressure equalization performance of rainscreen wall.

　Through collecting documents, case studies and construction material catalogs, as well as via studying of rainscreen wall construction and parameters that affect pressure equalization performance, the research scope was determined to focus on how rainscreen wall with point support system and rainscreen vent holes in different geometric shapes achieves the effect of pressure equalization by changing vent rate and cavity volume under various wind velocity. After making reference to related experiment methods and instruments, it was selected to carry out a wind tunnel experiment which is closer to the flow-field conditions in a real situation.

　The following results are presented after statistical analysis of the experiment data:
I. There is data deviation between pressure measured from the back side of rainscreen and on air barrier (the maximum difference is about 20% while minimum is about 5%). It is suggested to set up measure points on the back side of rainscreen when conducting related experiments in the future.

II. Located at front windward with wind velocity of 8-19 m/s, the pressure equalization performance of striped vent hole went down from 96% to 87%. For circular vent hole, it went down from 90% to 82%; while for open joint the performance was between 82-85%. Striped vent hole has the best pressure equalization performance among all.

III. Located at front windward with wind velocity of 8-19 m/s, the effect of cavity volume changes on pressure equalization performance was about 3% maximum (83-86%); the effect of vent rates on pressure equalization performance was about 7% maximum (83-90%); the effect of hole aperture changes on pressure equalization performance was about 11% maximum. It can be stated that changing cavity volume has the less obvious effect on pressure equalization performance.

　As a conclusion, a table regarding reduction factor of applying pressure equalization to reduce wind load will be provided according to the data gained from the experiment.

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