中文核心期刊
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Journal of Chongqing Jiaotong University(Natural Science)

Journal of Chongqing Jiaotong University(Natural Science) ›› 2009, Vol. 28 ›› Issue (4): 660-663.DOI: 10.3969/j.issn.1674-0696.2009.04.05

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Calculation?of?Protective?Layer?Thickness?for?Preventing?Longitudinal?Cracks?of??Prestressed?Concrete?T-Beam

FENG Jie-chun1, XU Yong2, 3, ZHONG Yun-jian4   

  1. 1.?Shenzhen?Municipal?Design?Institute?Co.?Ltd,?Guangdong?Shenzhen?518035,?China;2.?Chongqing?Jiaotong?University,?Chongqing?400074,?China;?3.?Southwest?Jiaotong?University,?Sichuan?Chengdu?610031,?China;4.?Chongqing?Communica-?tions?Research?＆?Design?Institute,?Chongqing?400067,?China
  • Received:2009-04-25 Revised:2009-06-12 Online:2009-08-15 Published:2015-04-15

预应力混凝土T梁防纵裂的保护层厚度计算

封洁纯1,徐勇2,3,钟云健4   

  1. 1.深圳市市政设计研究院有限公司,广东深圳518035;2.重庆交通大学,重庆400074; 3西南交通大学,四川成都610031;4重庆交通科研设计院,重庆400067
  • 作者简介:封洁纯(1962—),女,湖南隆回人,高级工程师,主要从事市政设计工作。E-mail:xuyong@cqjtu.edu.cn。
  • 基金资助:
    国家自然科学基金项目( 50808188)

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Abstract: The?causes?of?longitudinal?cracks?of?prestressed?concrete?T-beam?are?discussed.?The?great?transverse?tension?stress?on?the?bottom?floor?caused?by?the?reversed?effect?of?tensional?prestressed?steel?bar?on?up-flexion?of?T-beam?and?the?overlapping?enhancing?Poisson?effect?are?analyzed.?Combining?with?theoretic?analysis?and?numerical?computing?method,?a?formula?is?deduced?to?compute?the?minimum?protective?layer?thickness?of?the?prestressed?pipeline?under?the?disadvantageous?stress

Key words: prestressed concrete T-beam , protective layer thickness , transverse tension stress

摘要： 讨论了引起混凝土预应力T梁纵向开裂的原因,分析了张紧的预应力钢束对梁体上拱变形的反向作用和受 压混凝土由泊松效应引起的横向拉应变作用,并结合理论分析和数值方法提出了考虑上述作用下T梁预应力管道 的最小保护层厚度的计算公式。

关键词: 预应力混凝土T梁, 保护层厚度, 横向拉应力

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