- 摘 要
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薛偉辰 王 驊?。ㄍ瑵髮W建筑工程系 上?！?00092）
[提要] 對國內(nèi)外有關(guān)鋼－混凝土組合梁體外預應力筋極限應力的研究成果進行了較為系統(tǒng)的綜述。根據(jù)近期完成的4根體外預應力鋼－混凝土組合梁單調(diào)全過程試驗，提出了體外預應力筋預應力損失的設計建議。基于虛功原理和變形協(xié)調(diào)條件分別推導了體外預應力筋彈性增量和極限應力的計算公式，在此基礎上建立了體外預應力鋼－混凝土組合梁抗彎承載力的計算公式，并編制了計算程序，程序計算值與試驗結(jié)果吻合良好。
[關(guān)鍵詞] 體外預應力 鋼－混凝土組合梁 預應力損失 極限應力 抗彎承載力The existing research achievements, at home and abroad, on ultimate stress of external tendons in the prestressed steel-concrete composite beams are systematically summarized. On the basis of experiments of four prestressed steel-concrete composite beams under monotonous loads, prestressing loss of external tendons is studied and the corresponding design suggestions are put forward. Based on the principle of virtual principle and compatibility between the deformations of the composite beam and the tendons,a formula is developed for calculating elastic increment and ultimate
increment of external tendons. Design equations, capable of calculating flexural capacity of prestressed steel-concrete composite beams, are derived after taking into account the prestressed stress increments, and the corresponding program is developed. The calculations by the program are in good agreement with test results.
Keywords: external prestressing; steel-concrete composite beams; prestressing loss; ultimate stress; flexural capacity參 考 文 獻
1．薛偉辰．現(xiàn)代預應力結(jié)構(gòu)設計．北京：中國建筑工業(yè)出版社，2003．
2．房貞政．無粘結(jié)與部分預應力結(jié)構(gòu)．北京：人民交通出版社，1999．
3．何池，預應力組合梁長短期性能研究與時隨分析．碩士學位論文，同濟大學，2002．
4. Hoadley P G. Behavior of prestressed composite steeL beams.J Structural Division, ASCE, 1963, 89(3):21-34
5. Saadatmanesh H, Albrecht P, Ayyub B M. Analytical study of prestressed composite beams.J Structural Division, ASCE, 1989, 115 (9)：2109-2121.
6．聶建國，高璀旭，周天然．預應力鋼-混凝土組合梁承載力計算方法．建筑結(jié)構(gòu)，2002，32(10):56-59．
7．薛偉辰，何池，王驊等．新型預應力組合梁的力學性能．同濟大學學報，2003，31(3)．
