| 体外预应力加固混凝土简支梁的反拱挠度分析 |
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| 引用本文： | 王云飞,孟少平,贾卉琳,王国林.体外预应力加固混凝土简支梁的反拱挠度分析[J].东南大学学报(自然科学版),2007,37(6):1032-1035. |
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| 作者姓名： | 王云飞 孟少平 贾卉琳 王国林 |
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| 作者单位： | 东南大学土木工程学院,南京,210096 |
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| 摘 要： | 为了在施加预应力阶段准确地计算混凝土梁的反拱挠度,在计算过程中将混凝土梁的抗弯刚度分为有裂缝抗弯刚度和裂缝闭合抗弯刚度.试验采用6根体外预应力加固混凝土简支梁进行研究,先将混凝土梁加载至一定裂缝宽度,再进行体外预应力加固.在试验过程中发现,从张拉预应力初始阶段到张拉预应力结束,由于混凝土梁裂缝的逐渐闭合,混凝土梁的抗弯刚度是逐渐增大的.通过对混凝土梁的截面分析,将混凝土梁的抗弯刚度分为有裂缝抗弯刚度和裂缝闭合抗弯刚度,提出了体外预应力加固混凝土简支梁反拱挠度的计算方法,并用试验结果与计算公式的计算值进行了对比分析,结果表明,计算结果与试验结果吻合较好.
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| 关 键 词： | 体外预应力 加固 弯曲刚度 反拱挠度 |
| 文章编号： | 1001-0505(2007)06-1032-04 |
| 修稿时间： | 2007年3月30日 |
Inverted arch deflection analysis for reinforced concrete beams strengthened by external prestressing tendons |
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| Wang Yunfei,Meng Shaoping,Jia huilin,Wang Guolin.Inverted arch deflection analysis for reinforced concrete beams strengthened by external prestressing tendons[J].Journal of Southeast University(Natural Science Edition),2007,37(6):1032-1035. |
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| Authors: | Wang Yunfei Meng Shaoping Jia huilin Wang Guolin |
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| Abstract: | Inverted-arch deflection caused by prestressing is calculated accurately by classifying the bending stiffness of beams as bending stiffness with crack and bending stiffness with close crack.6 reinforced concrete beams loaded with crack were strengthened by external prestressing tendons.It is discovered that bending stiffness of concrete beams increase gradually as a result of beam crack closure due to stretching tendons.Based on analysis of beam section,bending stiffness of beams is classified as bending stiffness with crack and bending stiffness with close crack,and inverted arch deflection of reinforced concrete beams are calculated.The theoretical calculation is found to be in agreement with the test result through comparison of test result and calculation. |
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| Keywords: | external prestressing strengthening bending stiffness inverted-arch deflection |
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