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Optimized Prestressed Continuous Composite Girder Bridges with Corrugated Steel Webs

机译：波形钢腹板优化的预应力连续组合梁桥

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摘要

This paper proposes different optimization schemes for enhancing the performance of conventional continuous composite girder bridges with corrugated steel webs. In particular, for the positive moment region, the substitution of a ribbed steel plate for the reinforced concrete bottom flange is proposed for optimizing such bridges. Three-dimensional finite-element analysis was used to preliminarily validate this optimization scheme based on the background project, Dongbaohe Xinan Grand Bridge. An experimental study revealed that the optimization scheme can afford advantages, such as reduced self-weight, avoidance of cracking in the bottom flange, and convenient construction. If the steel plate with proper thickness is used, higher flexural stiffness and load capacity can be achieved as additional advantages due to the enhanced steel ratio of the cross section. For the negative moment region of the bridge, the optimization scheme was implemented in two parts identified as Optimization Schemes I and II. In Scheme I, corrugated steel plate-concrete composite webs were used, whereas a steel-concrete composite bottom flange was further adopted in Scheme II. Compared to the conventional scheme, both Optimization Schemes I and II significantly reduced the shear stress in the corrugated steel web and at the steel-concrete interface due to the lined concrete in the web. Thus, it can be deduced that the applied load corresponding to the yield of the corrugated steel web will be enhanced; namely, the shear capacity will be enhanced. Because shear connection failure was prevented in both optimization schemes, there were remarkable improvements of the load capacity and ductility of the girder. The confining effect of the lined concrete decreased the prestress lead-in ratio, but not significantly. In addition, Optimization Scheme II afforded much greater construction convenience compared to both Optimization Scheme I and the conventional scheme. (C) 2016 American Society of Civil Engineers.
机译：本文提出了不同的优化方案，以提高波纹钢腹板的传统连续组合梁桥的性能。特别地，对于正力矩区域，提出了用肋骨钢板代替钢筋混凝土底部凸缘来优化这种桥梁。基于背景工程东宝河新安大桥，利用三维有限元分析对该优化方案进行了初步验证。实验研究表明，该优化方案具有降低自重，避免底部法兰开裂，施工方便等优点。如果使用具有适当厚度的钢板，由于横截面的钢比提高，则可以获得更高的挠曲刚度和更高的承载能力，这是附加的优势。对于桥梁的负弯矩区域，优化方案分为两部分实施，分别为优化方案I和II。在方案I中，使用了波纹钢板-混凝土复合腹板，而在方案II中进一步采用了钢-混凝土复合底部法兰。与常规方案相比，优化方案I和II均显着降低了波纹钢腹板和钢-混凝土界面中的剪切应力，这是由于腹板中衬有混凝土所致。因此，可以推断出，对应于波纹钢幅材的屈服的施加载荷将增加。即，剪切能力将增强。由于在两种优化方案中均避免了剪切连接故障，因此梁的承载能力和延性得到了显着改善。衬砌混凝土的约束作用降低了预应力导入比，但没有显着降低。此外，与优化方案I和常规方案相比，优化方案II提供了更多的构造便利。 （C）2016年美国土木工程师学会。

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  • 来源
    《Journal of bridge engineering》 |2017年第2期|04016121.1-04016121.17|共17页
  • 作者

    Nie Jian-Guo; Zhu Ying-Jie; Tao Mu-Xuan; Guo Chao-Ran; Li Yi-Xin;

  • 作者单位

    Tsinghua Univ, Dept Civil Engn, Beijing Engn Res Ctr Steel & Concrete Composite S, Beijing 100084, Peoples R China;

    Tsinghua Univ, Dept Civil Engn, China Educ Minist, Key Lab Civil Engn Safety & Durabil, Beijing 100084, Peoples R China;

    Tsinghua Univ, Dept Civil Engn, China Educ Minist, Key Lab Civil Engn Safety & Durabil, Beijing 100084, Peoples R China;

    Tsinghua Univ, Dept Civil Engn, China Educ Minist, Key Lab Civil Engn Safety & Durabil, Beijing 100084, Peoples R China;

    Tsinghua Univ, Dept Civil Engn, China Educ Minist, Key Lab Civil Engn Safety & Durabil, Beijing 100084, Peoples R China;

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  • 正文语种 eng
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  • 关键词

    Optimization scheme; Continuous girder bridge; Prestressed; Composite girder; Corrugated steel web;

    机译：优化方案;连续梁桥;预应力;复合梁;波形钢腹板;

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