- 期刊
- OpenAccess
水庫輸水隧道壓力鋼管靜態結構之有限元素分析及實驗量測
Experimental Measurement and FEM Analysis of the Structure of the Penstock in the Water Releasing Tunnel
摘要
本研究應用美國ANSYS公司發展的ANSYS 5.2有限元素軟體，以及現場實驗量測的方法，分析南化水庫輸水隧道之壓力鋼管靜態結構。FEM分析的情況包括：（i）埋設山腹中承受均佈內壓，均佈外壓，及局佈外壓的壓力鋼管；（ii）靠近伸縮節且暴露於大氣，承受均佈內壓的壓力鋼管。由於受限於客觀環境，實驗只針對靠近伸縮節且暴露於大氣，承受均佈內壓之壓力鋼管。比較FEM數值與實驗數據，得知本研究所採用的FEM Model為一合理而且可靠的Model。利用此一FEM Model預估水庫加20公尺，現有輸水隧道之壓力鋼管之應變。結果顯示現有輸水隧道之壓力鋼管，如果在山腹中有管湧作用在壓力鋼管外壁，且局部外壓在9.5kgf／cm^2，以及作用面積小於1m^2時，足以承受加高後之最高水庫水位（205m）之靜態負荷。
並列摘要
By employing finite element software, ANSYS 5.2 and the filed instrumention, the static structure of the penstock in water Releasing tunnel of Nan-Haw Reservoir, Nan-Haw, Taiwan, R.O.C. was studied numerically and experimentally. The FEM analysis cases included (i) penstock in the tunnel receiving the uniform internal pressure, the uniform external pressure and the concentrated external pressure; (ii) penstock close to expansion joint receiving the uniform internal pressure. By copmaring FEM numerical results with experimental data, we obtained a reasonable and reliable FEM model. By using this FEM model, we evaluated whether the existent penstock is able to stand for the additional 20 m water head or not. If there is piping acting upon the outer surface of the penstock, the concentrated external pressure is 9.5 kgf/cm^2, and the area is less than 1 m^2, the existing penstock is able to stand for additional 20 m hydrostatic water head.