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趙燕潞1，王 維2
(1中國建筑上海設計研究院有限公司，上海200063; 2上海市政設計研究總院，上海200092)[摘要] 對變截面預應力梁進行有限元分析時，其預應力荷載最終要轉化到單元節(jié)點上，因此有關變截面梁預應力效應的計算是解決此類問題的關鍵，根據(jù)有限元理論，引入變截面梁單元的形函數(shù)，推導了計算具有任意預應力筋曲線形狀及沿預應力筋縱向具有任意分布的預應力所產生的變截面梁端等效荷載的積分表達式。從而為預應力混凝土變截面梁的計算提供了一種新的求解思路。
[關鍵詞] 變截面梁；預應力混凝土；等效節(jié)點荷載Calculation of the pre-stress effects in concrete non-prismatic beam
Zhao Yanlu1, Wang Wei2
(1 China Shanghai Architectural Design and Research Institute Co., Ltd., Shanghai 200063, China; 2 Shanghai Municipal Engineering Design Generallnstitute Shanghai 200092, China)Abstract: When analyzing prestressed concrete non-prismatic beams with the theory of finite element, the prestres:sed load will be eventually transferred to the element node, so calculating the equivalent nodal load of prestressed concrete beams with non-prismatic sections is very important. According to the theory of finite element,a formula for calculating the equivalent nodal load due to prestressing with any initial tendon profile and any distribution of prestress along the cable has been developed by using the shape function of a non-prismatic beam element, which offers a effective analysis algorithm for designing non-prismatic beams in prestressed concrete structures.
Keywords: non-prismatic beam; prestressed concrete; equivalent nodal load
