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| 预应力混凝土T梁防纵裂的保护层厚度计算 | |
| 引用本文： | 封洁纯,徐勇,钟云健.预应力混凝土T梁防纵裂的保护层厚度计算[J].重庆交通大学学报(自然科学版),2009,28(4):660-663. |
| 作者姓名： | 封洁纯 徐勇 钟云健 |
| 作者单位： | 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;西南交通大学,四川,成都,610031 3. 重庆交通科研设计院,重庆,400067 |
| 基金项目： | 国家自然科学基金项目 |
| 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 |
Calculation of Protective Layer Thickness for Preventing Longitudinal Cracks of Prestressed Concrete T-Beam |
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| FENG Jie-chun,XU Yong,ZHONG Yun-jian.Calculation of Protective Layer Thickness for Preventing Longitudinal Cracks of Prestressed Concrete T-Beam[J].Journal of Chongqing Jiaotong University,2009,28(4):660-663. | |
| Authors: | FENG Jie-chun XU Yong ZHONG Yun-jian |
| Institution: | FENG Jie-chun1,XU Yong2,3,ZHONG Yun-jian4(1.Shenzhen Municipal Design Institute Co.Ltd,Guangdong Shenzhen 518035,China,2.Chongqing Jiaotong University,Chongqing 400074,3.Southwest Jiaotong University,Sichuan Chengdu 610031,4.Chongqing Communications Research & Design Institute,Chongqing 400067,China) |
| 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. |
| Keywords: | prestressed concrete T-beam protective layer thickness transverse tension stress |
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