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首页> 外文期刊>Journal of bridge engineering >Structural Evaluation of Steel-Concrete Joint with UHPC Grout in Single Cable-Plane Hybrid Cable-Stayed Bridges
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Structural Evaluation of Steel-Concrete Joint with UHPC Grout in Single Cable-Plane Hybrid Cable-Stayed Bridges

机译：单索面混合斜拉桥钢骨联合UHPC灌浆结构评估

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摘要

In order to investigate the mechanical behavior of the steel-concrete joint with ultrahigh performance concrete (UHPC) grout in single cable-plane hybrid cable-stayed bridges, a model test with a scale of 1:3 for a hybrid girder consisting of a flat steel box girder, a prestressed concrete (PC) box girder, and a steel-concrete joint connecting the steel and prestressed concrete girders was conducted. Structural responses of large-scale specimens under combined actions of axial compression, bending, and twisting moments are presented and discussed. Experimental results indicated that steel-concrete joints with UHPC grout exhibited favorable combined behavior and adequate strength. Under a maximum applied load that is twice as much the design load, the system components, including surface plates/slabs, UHPC, perforated webs, and perforated rebars, behaved within the elastic range. Stresses generated at the steel-concrete joint were mainly determined by axial and flexure forces. The influence of torsion on joint behavior was insignificant. It was also shown that approximately 65% of the overall force transferred through the steel-concrete joint was in the form of compression effects between the bearing steel plate and UHPC, and that the remaining 35% force was dispersed via shear connectors. Furthermore, finite-element (FE) models were developed and calibrated with the experimental results. The numerical results indicated that load transferred via the bearing plate compression effect gradually increased with the steel cell height. The outcomes of this study provide a reference for future application of the steel-concrete joint with UHPC in hybrid girder bridges. (c) 2019 American Society of Civil Engineers.
机译：为了研究单电缆-平面混合斜拉桥中超高性能混凝土（UHPC）灌浆的钢-混凝土接头的力学性能，对比例为1：3的混合梁的平面模型进行了模型测试进行了钢箱梁，预应力混凝土（PC）箱梁以及连接钢梁和预应力混凝土梁的钢混凝土接头。提出并讨论了在轴向压缩，弯曲和扭转力矩共同作用下的大型试件的结构响应。实验结果表明，UHPC灌浆的钢混凝土接头表现出良好的组合性能和足够的强度。在最大施加载荷是设计载荷的两倍的情况下，系统组件（包括面板/平板，UHPC，多孔板和多孔钢筋）在弹性范围内工作。钢-混凝土接头处产生的应力主要由轴向力和挠曲力决定。扭转对关节行为的影响微不足道。还显示出，通过钢-混凝土接头传递的总力中约有65％是轴承钢板与UHPC之间的压缩效应，其余35％的力是通过剪切接头分散的。此外，开发了有限元（FE）模型并根据实验结果进行了校准。数值结果表明，通过承压板压缩效应传递的载荷随着钢格高度的增加而逐渐增大。这项研究的结果为将来将钢-混凝土联合UHPC应用于混合箱梁桥提供参考。 （c）2019美国土木工程师学会。

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