| 对预应力混凝土箱梁桥应力设计方法的探讨 |
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| 引用本文： | 龙佩恒,陈惟珍.对预应力混凝土箱梁桥应力设计方法的探讨[J].公路,2007(5):80-83. |
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| 作者姓名： | 龙佩恒 陈惟珍 |
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| 作者单位： | 1. 北京建筑工程学院土木工程系,北京市,100044
2. 同济大学桥梁工程系,上海市,200092 |
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| 摘 要： | 在调查既有预应力混凝土连续箱梁桥开裂状况和裂缝形态的基础上,较全面地分析了引起箱梁受力开裂的原因。指出现阶段桥梁设计中采用的平面杆系程序,对箱梁局部应力估算的不准确是导致箱梁受力开裂的主要原因。根据箱梁结构的受力特点,提出采用应力设计方法解决预应力混凝土箱梁的受力开裂问题。通过实桥算例分析,论证了箱梁空间应力状态分析对保证箱梁桥结构安全的必要性。
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| 关 键 词： | 预应力混凝土箱梁桥 混凝土开裂 空间应力 应力设计方法 |
| 文章编号： | 0451-0712（2007）05-0080-04 |
| 修稿时间： | 2006-12-01 |
Approach to Stress Design Method for PC Box Girder Bridges |
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| LONG Pei-heng,CHEN Wei-zhen.Approach to Stress Design Method for PC Box Girder Bridges[J].Highway,2007(5):80-83. |
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| Authors: | LONG Pei-heng CHEN Wei-zhen |
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| Institution: | 1. Department of Civil Engineering, Beijing Institute of Civil Engineering and Architecture, Beijing 100044, China; 2. Department of Bridge Engineering,Tongji University, Shanghai 200092, China |
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| Abstract: | A survey of the cracks conformation and distribution rules in the PC box girders is presented.The causes and the influence factors of the box girder cracking are analyzed.The undetermined local stress that calculated by the plane bar elements is the primary reason in present design methods.On the basis of the mechanical behavior of box girders,the stress design method is brought forward against the PC box girder bridge cracking.According to the results of a actual bridge,it is demonstrated that the spatial stress analysis is indispensable to the box girder bridge safety. |
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| Keywords: | PC box girder bridges concrete cracking spatial stress stress design method |
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