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Analysis and design of slab-on-girder highway bridge decks.

机译：板式公路桥梁桥面分析与设计。

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摘要

It has been observed from test and analysis results that the differential deflection between girders in a slab-on-girder bridge deck reduces the negative bending moments in the deck slab. However, the effect of girder deflection is not considered in the traditional design method for bridge decks.;A simplified method for bridge deck analysis considering the effect of girder deflection is developed based on a closed-form analytical solution which is fine tuned with results of finite element analysis. This is based on the superposition of two analytical solutions. The first solution is for calculating the negative bending moment in a deck slab on rigid girders. This is obtained with a three-edge-simply-supported and one-edge-fixed slab subjected to a concentrated load. The second is for evaluating the positive bending moment in a deck slab induced by girder deflections. The latter is obtained with the moment-displacement relation of a two-edge-simply-supported slab subjected to a wheel load. To this end, the differential deflection between girders in a deck subjected to a single axle load is estimated with the orthotropic plate theory. With this approach, the effects of the girder stiffness and spacing, and the span length of the bridge on the maximum negative bending moments in a deck slab can be assessed. The simplified analysis method is validated with finite element models.;With the simplified analysis method, the maximum negative bending moment in a deck can be accurately evaluated based on the magnitude of the wheel load, the girder spacing and stiffness, and the bridge span length. The maximum negative bending moments in a deck tend to be over-estimated by the method recommended by AASHTO, especially for deck sections at the mid-span of a bridge where girder deflection is most significant. Design recommendations that can lead to a significant reduction of the top reinforcement in a deck slab by taking advantage of girder deflections are proposed.
机译：从测试和分析结果中可以看出，梁板上桥板中的梁之间的差异挠度减小了桥板上的负弯矩。然而，传统的桥面板设计方法没有考虑梁的挠度影响。；基于封闭形式的解析解，开发了一种考虑梁变形影响的简化桥面板分析方法，并对该结果进行了微调。有限元分析。这是基于两个分析解决方案的叠加。第一种解决方案是计算刚性大梁的桥面板中的负弯矩。这是通过承受集中载荷的三边简单支撑和单边固定平板获得的。第二个是用于评估由大梁挠度引起的楼板正弯矩。后者是通过承受车轮载荷的两边简单支撑板的弯矩-位移关系获得的。为此，利用正交异性板理论估算了承受单轴载荷的甲板中大梁之间的差异挠度。通过这种方法，可以评估大梁刚度和间距以及桥的跨度对甲板平板中最大负弯矩的影响。该简化分析方法已通过有限元模型进行了验证；通过该简化分析方法，可以根据车轮载荷的大小，梁的间距和刚度以及桥梁的跨度长度来准确评估甲板中的最大负弯矩。 。桥面的最大负弯矩往往会被AASHTO推荐的方法高估，尤其是对于桥梁中跨处的桥面，其中梁的挠度最为明显。提出了一些设计建议，这些建议可以通过利用梁的挠度来显着减少桥面板中的顶部钢筋。

著录项

  • 作者

    Cao, Li.;

  • 作者单位

    University of Colorado at Boulder.;

  • 授予单位 University of Colorado at Boulder.;
  • 学科 Engineering Civil.;Engineering Mechanical.
  • 学位 Ph.D.
  • 年度 1996
  • 页码 146 p.
  • 总页数 146
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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