| 预应力混凝土箱梁腹板主应力分析 |
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| 引用本文： | 吕建鸣,陈可. 预应力混凝土箱梁腹板主应力分析[J]. 公路交通科技, 2005, 22(10): 51-55,59 |
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| 作者姓名： | 吕建鸣 陈可 |
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| 作者单位： | 交通部公路科学研究所,北京,100088 |
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| 摘 要： | 预应力混凝土箱型截面桥梁结构是我国桥梁工程中最常用桥型结构形式之一。已建成的此类桥梁中有不少出现了腹板开裂现象,裂缝成因与主拉应力计算影响的因素有关。结合公路桥梁结构设计系统GQJS按照JTG D62-2004新桥规的改版工作,讨论变高度梁弯矩轴力修正、钢筋换算截面修正以及竖向预应力等因素对箱梁腹板主应力计算的影响,并结合实例进行分析,对比新、旧规范在斜截面抗裂性能验算方面的不同要求。
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| 关 键 词： | 桥梁结构 箱型截面 主应力 GQJS 抗裂性能 |
| 文章编号： | 1002-0268（2005）10-0051-05 |
| 收稿时间： | 2005-04-16 |
| 修稿时间： | 2005-04-16 |
Principal Stress Analysis for Web of PC Bridge with Box Section |
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| LV Jian-ming,CHEN Ke. Principal Stress Analysis for Web of PC Bridge with Box Section[J]. Journal of Highway and Transportation Research and Development, 2005, 22(10): 51-55,59 |
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| Authors: | LV Jian-ming CHEN Ke |
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| Affiliation: | Research Institute of Highway, The Ministry of Communication, Beijing 100058, China |
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| Abstract: | PC Bridge with box section is one of the most popular structure types in the bridge construction in China.Some cracks had appeared on the webs of these box girder bridges.It is relative with the calculation of principal tension stress.Combining with the work of bridge structure design system(Chinese name abbr.GQJS) modified according to the new Chinese Bridge Code(JTG D622004),the influences of calculating factors of principal stress of web of box girder bridges are discussed,such as internal forces modification of variable height girders,conversion section of reinforcement bars and vertical prestressing force. And a practical case is analyzed to compare different requirements for crack resistance under the new Codes and old Codes. |
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| Keywords: | Bridge structure Box girder Principle stress GQJS Crack resistance |
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