无粘结部分预应力混凝土梁正截面强度的研究  

ULTIMATE MOMENT OF UNBONDED PARTIALLY PRESTRESSED CONCRETE BEAMS

作　　者：陆洲导[1] 张士铎[1] 

机构地区：[1]同济大学

出　　处：《土木工程学报》1992年第6期1-9,共9页China Civil Engineering Journal

摘　　要：本文通过五根无粘结部分预应力混凝土箱形截面梁试验,研究了无粘结部分预应力混凝土梁的正截面强度。在国内外学者研究的基础上,通过理论分析推导了梁极限破坏时无粘结预应力筋应力的计算公式,并且考虑了跨高比和附加非预应力钢筋对此应力的影响,提出了无粘结部分预应力混凝土梁正截面强度的计算方法。经试验验证和通过比较分析可知本文方法是可靠的。This paper deals with the ultimate moment of unbonded partially prestressed concrete beams through the test of five unbonded partially prestre-ssed concrete box beams. On the basis of existing theories, a formula forcomputing the stress increment in unbonded prestressed tendons at failurehave been proposed, in which the span over depth ratio and the effact of addi-tional non-prestressed reinforcement on the stress increment are taken intoconsideration. A method for predicting the ultimate moment of unbondedpartially prestressed concrete beams is presented with its results verified bytests. In comparison with the results of other calculation methods, the sug-gested method is rather reliable.

关 键 词：预应力 混凝土 梁 正截面 强度 

分 类 号：TU378.201[建筑科学—结构工程]