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DESIGN AND STRESS ANALYSIS OF A NEW TYPE PRESTRESSED CONCRETE COMPOSITE BEAM
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摘要: 介绍一种新型的预应力混凝土叠合梁二次预应力混凝土叠合梁，分析其设计特点；并应用于高速铁路无碴轨道桥梁中，根据设计实例进行应力分析，与相同截面尺寸的常规预应力混凝土梁的应力进行对比。结果表明：与常规预应力混凝土梁相比，二次预应力混凝土叠合梁受力合理，可以明显减小截面应力梯度，对减小梁的徐变上拱非常有利；并可以节约预应力筋约10%，具有明显经济优势。Abstract: A new type of prestressed concrete composite beam( double prestressed composite beam)was introduced, its design feature was analyzed. The new type prestressed concrete composite beam was proposed to be applied to high-speed railway ballastless track bridge. Whose stresses in different construction stages were analyzed according to the design of an actual project and contrasted to conventional prestressed concrete beam. The results show double prestressed composite beam has a smaller stress gradient which is propitious to decrease the creep camber of prestressed concrete beam; about 10% of the tendon can be saved by the double prestressed composite beam, which has obvious economic advantages.
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Key words:
- bridge engineering /
- double prestress /
- composite beam /
- stress gradient /
- stress analysis
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新建时速300～350 km客运专线铁路设计暂行规定[S]. 北京:中国铁道出版社，2005. [2] Deng Jun，Shao Xudong，Li Lifeng，et al. Experimental Research on the Creep Behavior of Twice Prestressed Concrete Beam[J].Structural Engineering International，2006，16(1) :53-58. [3] 邵旭东，张伟，彭聪，等. 二次预应力梁的徐变和承载力试验研究[J]. 土木工程学报，2006，39(8) : 81-86. [4] 夏建中. 客运专线铁路预应力混凝土简支箱梁通用参考图简介[J]. 铁道标准设计，2006 (11) :90-93. [5] TB 1002. 32005 铁路桥涵钢筋混凝土和预应力混凝土结构设计规范[S]. [6] GB 500102002 混凝土结构设计规范[S]. -
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