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INFLUENCE OF SECONDARY MOMENT ON THE MECHANICAL PROPERTIES OF PPC CONTINUOUS BEAMS
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摘要: 从次弯矩产生的机理出发,分析了次弯矩对PPC连续梁极限荷载和内力重分布的影响,得出在低配筋的情况下,可不考虑次弯矩的影响;但在高配筋的情况下,所形成的塑性铰转动能力较小,次弯矩不可忽略。在次弯矩对截面不利的情况下,则应充分考虑次弯矩的影响。对于直线配筋的PPC连续梁,次弯矩能提高塑性铰的转动能力,因此,可增大这种PPC连续梁的弯矩调整幅度。Abstract: Starting from the mechanism producing the secondary moment,it was analyzed the influences of the secondary moment on the ultimate load and the internal force redistribution of PPC continuous beams;and it was obtained the conclusions that the influence of the secondary moment may not be considered at lower reinforcement ratio,but can not be neglected at higer reinforcement ratio because of the poorer rotational capacity of plastic hinge.Secondary moment can improve the rotational capacity of plastic hinge in PPC continuous beams of straight rainforcement;and the moment redistribution can be improved.
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薛伟辰.现代预应力结构设计.北京:中国建筑工业出版社,2003:90-104 [2] 时杰,杨晓庄.无粘结部分预应力混凝土连续梁次弯矩及其影响.哈尔滨工业大学学报(自然科学版),2002,18(2):368-371 [3] 房贞政,陈红媛.无粘结部分预应力混凝土连续梁弯矩重分布分析.福州大学学报(自然科学版),1996,24(3):47-52 [4] 简斌,白绍良,王正霖.预应力混凝土连续梁弯矩调幅延性要求.工程力学,2001,18(2):51-57 [5] 苑青山,于胜金,陈宏林.预应力混凝土结构中次弯矩概念理论分析.低温建筑技术,2001(2):27-28 -
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