| 大跨PC连续刚构桥跨中持续下挠成因及预防措施 |
| |
| 引用本文： | 陈宇峰,徐君兰,余武军.大跨PC连续刚构桥跨中持续下挠成因及预防措施[J].重庆交通学院学报,2007,26(4):6-8,41. |
| |
| 作者姓名： | 陈宇峰 徐君兰 余武军 |
| |
| 作者单位： | 重庆交通大学土木建筑学院 重庆400074 |
| |
| 摘 要： | 目前大跨PC连续刚构桥存在的主要问题是跨中的持续下挠和箱梁的开裂,从砼收缩徐变、预应力损失及箱梁的开裂三个方面分析了各自对跨中持续下挠的影响.由于影响徐变的因素多,因此精确计算徐变对跨中的下挠的影响非常困难,根据徐变产生下挠的机理提出了一些预防措施.
|
| 关 键 词： | 收缩徐变 长期下挠 恒载零弯矩 预应力损失 有效动刚度 裂缝 |
| 文章编号： | 1001-716X（2007）04-0006-03 |
| 收稿时间： | 2006-05-22 |
| 修稿时间： | 2006-09-02 |
Causes and Precautionary Measures to Long-term Deflection of Long Span Pre-stressed Concrete Box Girder of Continuous Rigid Frame Bridge |
| |
| CHEN Yu-feng,XU Jun-lan, YU Wu-jun.Causes and Precautionary Measures to Long-term Deflection of Long Span Pre-stressed Concrete Box Girder of Continuous Rigid Frame Bridge[J].Journal of Chongqing Jiaotong University,2007,26(4):6-8,41. |
| |
| Authors: | CHEN Yu-feng XU Jun-lan YU Wu-jun |
| |
| Abstract: | At present,the main problems of long span pre-stressed concrete box girder of continuous rigid frame bridges are excessive mid-span deflection and cracks in box girders.The three influences factors of long-term deflection including shrinkage and creep of concrete,the pre-stressed loss and cracks in box girder are discussed.The deflection from shrinkage and creep of concrete is hardly calculated exactly.So the countermeasures for the design and construction against the deflection are put forward based on the influence mechanism. |
| |
| Keywords: | shrinkage and creep long-term deflection zero bending moment of dead load pre-stressed loss effective dynamic stiffness crack |
| 本文献已被 CNKI 维普 等数据库收录！ |
