- 摘 要
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（華僑大學土木工程學院，泉州 362021）
［摘要］構(gòu)造了簡單的體外預(yù)應(yīng)力梁的摩擦單元，模擬轉(zhuǎn)向塊和體外筋之間的摩擦，同時指出了摩擦單元的位置。分析了不同偏心距和摩擦系數(shù)的體外預(yù)應(yīng)力簡支梁。計算結(jié)果表明：增加體外筋的偏心距是提高體外預(yù)應(yīng)力梁承載能力的最有效手段，偏心距對預(yù)應(yīng)力增量影響明顯；摩擦的存在可減小梁的最大彎矩和撓度，增加預(yù)應(yīng)力增量；當體外筋為無粘結(jié)筋時，可以忽略摩擦效應(yīng)；當體外筋為未經(jīng)潤滑的鋼絞線時，對于工程計算而言，忽略摩擦也是可行的。
［關(guān)鍵詞］簡支梁；體外預(yù)應(yīng)力；摩擦；體外筋；轉(zhuǎn)向塊
中圖分類號：TU378-2文獻標識碼：A文章編號：1002-848X(2012)03-0123-02
Analysis on friction element and friction effect for external prestressed beams
Fang Deping, Wang Quanfeng(College of Civil Engineering, Huaqiao University, Quanzhou 362021, China)
Abstract:A simple friction element of external prestressed beams was constructed, which simulated the friction between the external tendon and deviator. The location of the friction element was pointed out. The external prestressed simply supported beams with various eccentricities and friction coefficients were analyzed. The calculation results indicate that increasing the eccentricity is the most effective measure to enhance the load bearing capacity of external prestressed beams, and the influence of the eccentricity on the prestress increment is significant. The existence of friction reduces the maximum bending moment and the deflection of beams, and increases the prestress increment. For the unbounded tendon as external tendon, the friction effect can be neglected. For the strand without lubrication as external tendon, the neglect of friction is feasible in engineering calculation.
Keywords:simply supported beam; external prestress; friction; external tendon; deviator
*高校博士點專項科研基金(200803850001）。
作者簡介：方德平，博士，教授，Email：fdp@hqu.edu.cn。
參考文獻
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