| 箱梁活载正应力和剪应力放大系数讨论 |
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| 引用本文： | 朱怡,徐栋. 箱梁活载正应力和剪应力放大系数讨论[J]. 结构工程师, 2006, 22(4): 29-33,40 |
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| 作者姓名： | 朱怡 徐栋 |
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| 作者单位： | 同济大学,上海,200092 |
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| 摘 要： | 大中跨预应力混凝土桥梁工程中广泛采用的箱形截面，其薄壁效应成为计算中的难点。在计算活载应力时，常规的平面杆系计算程序采用放大系数的近似处理方法。利用空间计算程序引入了箱梁的翘曲自由度，考虑箱梁的薄壁效应，并结合苏通大桥辅桥工程实例对活载应力放大系数进行探讨。
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| 关 键 词： | 预应力桥梁 箱梁 薄壁效应 计算程序 |
Discussion on the Amplification Coefficient for Stress Calculation in Box Girders |
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| ZHU Yi,XU Dong. Discussion on the Amplification Coefficient for Stress Calculation in Box Girders[J]. Structural Engineers, 2006, 22(4): 29-33,40 |
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| Authors: | ZHU Yi XU Dong |
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| Affiliation: | Tongji University, Shanghai 200092 |
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| Abstract: | Thin-wall box structures are applied widely in long-span or mid-span bridges and it is difficult to calculated box beams. Conventional plane frame programs amplify the live load effect using the amplification coefficient when computing the stress of live load. The spatial frame program used in this paper introduces the warping freedom into the calculation model of box beams, and considers the thin-wall effect. Discussion about the amplification coefficient of stresses is carried out with the practical project of Sutong Bridge. |
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| Keywords: | prestressed concrete bridge box girder thin-wall effect computing program |
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