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首页> 外文期刊>Journal of bridge engineering >Parametric Study and Design Recommendations for In-Span Hinges in Reinforced Concrete Box-Girder Bridges
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Parametric Study and Design Recommendations for In-Span Hinges in Reinforced Concrete Box-Girder Bridges

机译：钢筋混凝土箱梁桥跨度参数化研究和设计建议

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摘要

In-span hinges (ISHs) are located at the bridge deck of reinforced concrete box-girder bridges and are used to transmit vertical loads between two adjacent parts of the deck. ISHs are disturbed regions because of the complex three-dimensional stress state caused by concentrated bearing loads and utility openings. The common modeling practice for ISHs is simplified two-dimensional idealization as short cantilevers following standard procedures. Such simplified analytical and design procedures lead to inefficient detailing because they do not take into account the realistic failure modes of ISHs; punching shear is one of these critical modes. In this study, the influence of reinforcement and geometrical detailing on the behavior and strength of ISHs is assessed using a computational approach. The computational model is calibrated based on previous experimental results and adopts nonlinear three-dimensional finite-element analysis (FEA), accounting for cracking of concrete and elastic-plastic behavior of reinforcement. The concrete material is modeled using the total strain rotating crack method, and the effect of compression softening is incorporated into the constitutive model. The reinforcing steel is modeled using embedded reinforcement formulation assuming a perfect bond between the concrete and the reinforcement. From the computational study, design guidelines are presented for better constructability of these disturbed regions. Findings from this study revealed that the strength of ISHs is mostly improved by increasing the amount of diagonal reinforcement in the seat and by increasing the bearing plate size.
机译：跨距铰链（ISH）位于钢筋混凝土箱梁桥的桥面板上，用于在桥面板的两个相邻部分之间传递垂直载荷。 ISH是受干扰的区域，因为集中的轴承载荷和公用设施开口会导致复杂的三维应力状态。 ISH的通用建模方法是按照标准程序将二维理想化简化为短悬臂式。这种简化的分析和设计程序会导致细节设计效率低下，因为它们没有考虑ISH的实际失效模式。冲剪是这些关键模式之一。在这项研究中，使用计算方法评估了钢筋和几何细节对ISH的行为和强度的影响。该计算模型基于先前的实验结果进行了校准，并采用了非线性三维有限元分析（FEA），考虑了混凝土的开裂和钢筋的弹塑性行为。使用全应变旋转裂纹方法对混凝土材料进行建模，并将压缩软化的影响纳入本构模型。使用嵌入的钢筋配方对钢筋进行建模，假设混凝土和钢筋之间具有完美的结合力。通过计算研究，提出了设计指南，以更好地构建这些受干扰区域。这项研究的结果表明，ISHs的强度可通过增加座椅的对角线加固量和增加承板尺寸来大大提高。

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