| 预应力度对简支梁桥上拱的影响 |
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| 引用本文： | 马春佳,冯小豪. 预应力度对简支梁桥上拱的影响[J]. 重庆交通大学学报(自然科学版), 2009, 28(6): 995-997,1032 |
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| 作者姓名： | 马春佳 冯小豪 |
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| 作者单位： | 重庆交通大学,土木建筑学院,重庆,400074;西南交通大学,土木工程学院,四川,成都,610031 |
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| 摘 要： | 对于预应力混凝土(PC)受弯构件,施加预应力将使其产生向上的反拱挠度,预应力度的大小直接影响着预应力混凝土构件上拱值。依托出现明显上拱问题的渝黔高速公路K44平摊子大桥,利用其设计参数,分析部分预应力A类构件和B类构件2种预应力度时所产生的不同上拱度值,得出预应力度对PC简支梁桥上拱的影响。分析表明,预应力度过大将导致梁体产生过大的上拱值。
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| 关 键 词： | 简支板梁 徐变上拱 部分预应力A类构件 部分预应力B类构件 |
Effect of Prestressed Force on Arch of Simply Supported Beam Bridge |
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| MA Chun-jia,FENG Xiao-hao. Effect of Prestressed Force on Arch of Simply Supported Beam Bridge[J]. Journal of Chongqing Jiaotong University, 2009, 28(6): 995-997,1032 |
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| Authors: | MA Chun-jia FENG Xiao-hao |
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| Abstract: | For flexural members of prestressed concrete,exerting prestressed force on it will generate an upward arch,and the prestressed force directly affects the arch size of prestressed concrete structures.Taking Pingtanzi Bridge located at K 44+528 section of Chongqing Yu-Qian Expressway as an example,which has obvious upward arch problem,different upward arch values caused by the partial prestressed component of A and that of B are analyzed by making use of the designing parameters.The effect of prestressed force on arch of PC simply supported beam bridge is obtained.The result indicates that the large prestressed force will make girder generate large arch values. |
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| Keywords: | simply supported plate girder creep of arch partial prestressed component of A partial prestressed component of B |
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