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（華僑大學土木工程學院，泉州 362021）

［摘要］提出了普遍適用的無粘結筋應力增量的計算方法,用等效荷載來表示無粘結筋的作用，既滿足縱向變形協(xié)調條件又滿足梁截面彎矩-軸力-曲率關系。計算了對稱和不對稱加載的無粘結預應力連續(xù)梁的應力增量。計算表明對稱加載的應力增量與回歸公式的計算值吻合良好；不對稱加載的應力增量低于相應的對稱加載值，兩者的比值近似等于兩種加載產生的線彈性變形的比值，約為0.55～0.75。

［關鍵詞］預應力混凝土；無粘結筋；非線性分析；極限應力；加載模式

Influence of asymmetric loading on ultimate stress of unbonded prestressed tendon

Fang Deping, Wang Quanfeng

(College of Civil Engineering, Huaqiao University, Quanzhou 362021, China)

Abstract:A generally applicable method to calculate stress increment of unbonded prestressed tendon is presented. The action of unbonded prestressed tendon is expressed by its equivalent loads. The method meets both longitudinal deformation compatibility condition and M-N-Φrelationship of beam section. The stress increments of unbonded prestressed tendon in the continuous beams subjected to both symmetrical and asymmetrical loads are analyzed. The increments for symmetrical loads conform well to results of the regression formula. The increment for asymmetrical loads is less than corresponding increment for symmetrical loads. The ratio of two increments is approximately equal to the ratio of the linear elastic deformations due to both loads, between 0.55～0.75.

Keywords:prestressed concrete; unbonded tendon; nonlinear analysis; ultimate stress; load mode

*福建省自然科學基金資助項目(E0410023，E0540005)；廈門市科技計劃項目(3502Z20074039)。

作者簡介：方德平，教授，博士，Email:fdp@hqu.edu.cn。