| 箱梁桥竖向预应力张拉工艺与张拉时机的研究 |
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| 引用本文： | 沈明燕,钟新谷,舒小娟.箱梁桥竖向预应力张拉工艺与张拉时机的研究[J].施工技术,2007,36(10):38-40. |
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| 作者姓名： | 沈明燕 钟新谷 舒小娟 |
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| 作者单位： | 湖南科技大学,湖南,湘潭,411201 |
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| 基金项目： | 国家自然科学基金;湖南省社会科学基金 |
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| 摘 要： | 通过有限元分析与试验研究,针对竖向预应力现行的施工缺陷,确定合理的张拉时机。并根据竖向预应力体系特点,结合高强螺栓拧紧工艺,提出拉伸-扭矩法。实践证明此法能较好地克服竖向预应力施工质量差的问题。
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| 关 键 词： | 腹板开裂 预应力损失 二次张拉 拉伸-扭矩法 |
| 文章编号： | 1002-8498(2007)10-0038-03 |
| 修稿时间： | 2007年3月5日 |
Research on Tension Technique and Stretching Time of Vertical Prestress in a Bridge with Box Girder |
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| SHEN Ming-yan,ZHONG Xin-gu,SHU Xiao-juan.Research on Tension Technique and Stretching Time of Vertical Prestress in a Bridge with Box Girder[J].Construction Technology,2007,36(10):38-40. |
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| Authors: | SHEN Ming-yan ZHONG Xin-gu SHU Xiao-juan |
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| Abstract: | Based on finite element theoretical analysis and test study,rational stretching time for construction of vertical prestress bars is deduced in this paper,which indicates the disadvantage of present construction method.Furthermore,according to characters of vertical prestress system combining with screw technology of high-strength bolt,stretch-torque construction technique is presented.Practice of such method leads to overcoming the problem of bad construction quality about vertical prestress bars. |
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| Keywords: | cracking in webs loss of prestress two-time tension stretch-torque technique |
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