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首页> 外文会议>Composite Construction in Steel and Concrete VII >Experiments on a Continuous Composite Truss Bridge with Concrete-Filled Lower Chords
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Experiments on a Continuous Composite Truss Bridge with Concrete-Filled Lower Chords

机译：下部混凝土弦索连续组合桁架桥的试验

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Concrete filled tubular structures have advantages to overcome stability of thin plates and to increase stiffness. A hybrid bridge combining common steel box girders and truss girders was suggested to increase the span length of steel-concrete composite bridges. In negative moment regions, a truss girder has lower chords of concrete filled rectangular steel box section to increase flexural stiffness. A bridge model with span length of 30m was fabricated and static tests were performed to assess the effect of composite chords on the flexural behavior of the girder. Depth of the girder varies from 2.0 m to 3.0 m. Significant reduction of stresses in lower steel chord was observed and measured deflections showed a good agreement with calculated values considering the contribution of infilled concrete. Cracking and crack width of the upper concrete slab were observed and indirect crack control by longitudinal reinforcing bars can be used for the design.
机译：填充混凝土的管状结构具有克服薄板稳定性并增加刚度的优点。建议将普通钢箱梁和桁架梁组合在一起的混合桥，以增加钢混凝土组合桥的跨度。在负弯矩区域，桁架梁具有较低的混凝土填充矩形钢箱形截面弦，以增加抗弯刚度。制作了跨度为30m的桥梁模型，并进行了静态测试，以评估复合弦对梁的抗弯性能的影响。大梁的深度从2.0 m到3.0 m不等。观察到下部钢弦的应力显着降低，考虑到填充混凝土的作用，测得的挠度与计算值显示出良好的一致性。观察了上部混凝土板的开裂和裂缝宽度，可以采用纵向钢筋间接控制裂缝的设计。

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