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Mechanical Behavior and Failure Mode of Steel–Concrete Connection Joints in a Hybrid Truss Bridge: Experimental Investigation

机译：混合桁架桥钢-混凝土连接节点的力学行为和破坏模式：实验研究

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摘要

The core part of a hybrid truss bridge is the connection joint which combines the concrete chord and steel truss-web members. To study the mechanical behavior and failure mode of steel–concrete connection joints in a hybrid truss bridge, static model tests were carried out on two connection joints with the scale of 1:3 under the horizontal load which was provided by a loading jack mounted on the vertical reaction wall. The specimen design, experimental setup and testing procedure were introduced. In the experiment, the displacement, strain level, concrete crack and experimental phenomena were factually recorded. Compared with the previous study results, the experimental results in this study demonstrated that the connection joints had the excellent bearing capacity and deformability. The minimum ultimate load and displacement of the two connection joints were 5200 kN and 59.01 mm, respectively. Moreover, the connection joints exhibited multiple failure modes, including the fracture of gusset plates, the slippage of high-strength bolts, the local buckling of compressive splice plates, the fracture of tensile splice plates and concrete cracking. Additionally, the strain distribution of the steel–concrete connection joints followed certain rules. It is expected that the findings from this paper may provide a reference for the design and construction of steel–concrete connection joints in hybrid truss bridges.
机译：混合桁架桥的核心部分是将混凝土弦和钢桁架腹板构件结合在一起的连接节点。为了研究混合式桁架桥中钢-混凝土连接节点的力学行为和破坏模式，在水平荷载下由比例为1：3的两个连接节点进行了静态模型测试，水平连接由安装在平台上的千斤顶提供。垂直反应墙。介绍了标本设计，实验设置和测试程序。在实验中，实际记录了位移，应变水平，混凝土裂缝和实验现象。与以前的研究结果相比，本研究的实验结果表明，连接接头具有出色的承载能力和变形能力。两个连接接头的最小极限载荷和位移分别为5200 kN和59.01 mm。此外，连接接头表现出多种破坏模式，包括角撑板的断裂，高强度螺栓的打滑，压缩拼接板的局部屈曲，拉伸拼接板的断裂和混凝土开裂。此外，钢-混凝土连接节点的应变分布遵循某些规则。可以预期，本文的研究结果可以为混合桁架桥中钢-混凝土连接节点的设计和施工提供参考。

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