| 预应力混凝土连续箱梁不同布索方式对比分析 |
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| 引用本文： | 张文学,龙佩恒,王丽群.预应力混凝土连续箱梁不同布索方式对比分析[J].公路交通科技,2009,26(9). |
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| 作者姓名： | 张文学 龙佩恒 王丽群 |
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| 作者单位： | 1. 北京工业大学,建筑工程学院,北京,100124
2. 北京建筑工程学院,土木与交通工程学院,北京,100044 |
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| 基金项目： | 交通部西部交通建设科技资助项目 |
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| 摘 要： | 从理论上对比分析了不同布索方式的优缺点,以某预应力混凝土连续箱梁桥为原型,通过数值计算对比分析了预应力损失对不同布索方式箱梁腹板主拉应力的影响.结果表明,在理论上取消下弯索,通过适当调整顶、底板索和竖向预应力筋来实现对腹板主拉应力控制是可行的;适当调整竖向预应力的大小,竖向+纵向布索方式混凝土强度提高系数优于下弯索布索方式;竖向预应力损失对竖向+纵向布索方式预应力混凝土箱梁腹板主拉应力的影响非常敏感.在实际工程中,竖向预应力损失50%后,竖向+纵向布索方式预应力混凝土箱梁腹板主应力的分布将劣于下弯索布索方式.
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| 关 键 词： | 桥梁工程 预应力箱梁 布索方式 下弯索 竖向预应力 预应力损失 |
Analysis of Different Tendon Layout Types for PC Continuous Box Girder |
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| ZHANG Wenxue,LONG Peiheng,WANG Liqun.Analysis of Different Tendon Layout Types for PC Continuous Box Girder[J].Journal of Highway and Transportation Research and Development,2009,26(9). |
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| Authors: | ZHANG Wenxue LONG Peiheng WANG Liqun |
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| Institution: | 1.School of Architecture and Civil Engineering;Beijing University of Technology;Beijing 100124;China;2.School of Civil and Transport Engineering;Beijing Architecture Engineering Institute;Beijing 100044;China |
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| Abstract: | The merits and faults of different types of tendon layout was discussed from theory point of view.Took a PC continuous box girder bridge as an example,the influence of the prestress loss on web principal tensile stress of different tendon layout types for PC box girder was analyzed by FEM methods.The result shows that(1)it is feasible to control web principal tensile stress without down-curved tendon by adjusting the top tendon,bottom tendon and vertical prestress tendon in theory;(2) the concrete strength ... |
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| Keywords: | bridge engineering PC box girder tendon layout type down-curved tendon vertical prestress prestress loss |
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