頁籤選單縮合
題 名 | 不同直徑環圈柱橋墩保護工周圍流場之變化=Numerical Simulation of Flow Field Around Ring Columns with Various Diameters for Pier Protection |
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作 者 | 王傳益; 林志遠; 黃上軒; 張詠善; | 書刊名 | 水土保持學報 |
卷 期 | 43:3 2011.09[民100.09] |
頁 次 | 頁297-310 |
分類號 | 441.816 |
關鍵詞 | 橋墩沖刷; 環圈柱; FLOW-3D; Pier scour; Ring columns; |
語 文 | 中文(Chinese) |
中文摘要 | 台灣河川之橋墩沖刷情形相當嚴重,落橋事件時有所聞,因此如何避免橋梁遭破壞為當前 重要課題。本研究利用FLOW-3D 軟體模擬墩前設置環圈柱保護工時,其三維流場之變化及物 理特性。在定床條件下,於不同環圈柱直徑(D/b=0.7、0.775、1)、潛沒環圈柱(H/y=0.5)、不同 環圈柱設置距離(L/b=1、2、3、4)等變化,針對流速、壓力與紊流能量加以探討。結果顯示, 設置環圈柱保護工時,由於不規則表面及透水孔隙削減紊流之動能,因而減緩橋墩沖刷深度。 當環圈柱高於水面且D/b=1、L/b=1 時,墩前之流速較未設置保護工時為小,橋墩保護效果最 為顯著。 |
英文摘要 | The pier scour is very serious in Taiwan's river. Bridge falling down accidents happened from time to time so that how to avoid the destruction of the bridge becomes an important subject. A numerical model FLOW-3D was used to simulate the three-dimensional flow field and physical characteristics when the ring columns protection works were setting in front of the pier. The velocity was discussed under the various parameters of ring columns diameter (D/b=0.7, 0.775, 1), submerged ring of columns (H/y=0.5), ring columns arranged distance (L/b=1, 2, 3, 4) in the fixed-bed condition. The results show that turbulence energy is reduction due to the irregular surface and permeable porosity when the ring column is arranged in front of the pier so that the scour depth of pier becomes weakerin degree. When the height of ring columns above the water surface and the condition D/b=1, L/b=1, the velocity in front of the pier is less than those not set protection works, and which is the most significant protective effect of bridge piers. |
本系統中英文摘要資訊取自各篇刊載內容。