| 预应力T形梁产生变形的原因及防治措施 |
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| 引用本文： | 张运涛.预应力T形梁产生变形的原因及防治措施[J].安徽建筑工业学院学报,2007,15(2):8-11. |
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| 作者姓名： | 张运涛 |
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| 作者单位： | 安徽建筑工业学院土木工程学院,合肥,230022;东南大学土木工程学院,南京,210096 |
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| 基金项目： | 安徽建筑工业学院青年自然科学基金项目（2002yq002）;安徽建筑工业学院硕博科研启动基金项目（2003） |
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| 摘 要： | 由于预应力等因素的影响,后张预应力混凝土T梁在张拉阶段会产生一定的反拱和侧弯现象;存梁期混凝土的徐变效应将加剧T梁的变形,变形值可能超过规范规定的限值.如对其不加控制,将给后续的施工带来困难和安全隐患.本文从设计和施工两方面系统地分析了变形产生的原因,并结合具体工程进行了力学分析,对存梁期徐变效应的作用进行了计算.最后提出控制T粱变形的方法,这对今后桥梁的设计与施工均有一定的借鉴作用.
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| 关 键 词： | T形梁 反拱 侧弯 徐变效应 变形控制 |
| 文章编号： | 1006-4540（2007）02-008-04 |
| 修稿时间： | 2006-11-23 |
The cause and prevention of deformation of prestressed T-shaped beam |
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| ZHANG Yun-tao.The cause and prevention of deformation of prestressed T-shaped beam[J].Journal of Anhui Institute of Architecture(Natural Science),2007,15(2):8-11. |
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| Authors: | ZHANG Yun-tao |
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| Affiliation: | ZHANG Yun-tao (1. Civil Engineering School of Anhui Institute of Architecture ＆ Industry, Hefei 230022, China;2. Civil Engineering School of South east University, Nanjing 21096, China) |
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| Abstract: | As a result of prestress, T-shaped beam of post-prestressed concrete appears invert camber and lateral bending on the prestretching stage. During the beam-preserving time, creep effect increases the deformation, which may exceed the code limits. Without any control measures taken, the deformation can result in difficulties for construction and pose as potential menace for structural safety. So in this paper, the cause of deformation is analyzed from the angles of design and construction. At the same time, mechanics analysis is developed and the action of creep is calculated with the combination of the actual engineering. The method of deformation control is also proposed in the paper, which can be used for references to design and construction of bridge. |
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| Keywords: | T-shaped beam invert camber lateral bending creep effect deformation control |
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