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首页> 外文期刊>Structure and Infrastructure Engineering >Field investigation of ultra-high performance concrete shear key in an adjacent box-girder bridge
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Field investigation of ultra-high performance concrete shear key in an adjacent box-girder bridge

机译：相邻箱梁桥超高性能混凝土剪切钥匙的现场研究

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摘要

Adjacent box girders are widely used in short to intermediate span bridges in several states because they make bridges quick and easy to build. However, the strength and serviceability of this type of bridge can frequently be compromised by the reductions in efficiency of load transfer and shear resistance due to joint degradation at the shear keys. Because of its superior mechanical properties and improved durability, ultra-high performance concrete (UHPC) has been proposed as an alternative grout material to eliminate shear key degradation. In this project, a single-span adjacent box-girder bridge was instrumented and monitored to investigate the performance of the UHPC shear keys under truck loads. The parameters of primary importance to shear key performance were identified from the response data. A finite element (FE) model of the bridge was developed to evaluate the efficiency of the load transfer mechanism at the UHPC joints. The UHPC shear key and transverse shear reinforcement bars fully transferred the load through the joints due to high bond strength of UHPC. The maximum relative displacement for all load cases was 0.151 mm (0.00594 in.) insufficient to cause damage to the UHPC shear key interface.
机译：相邻的盒子梁在几个状态中广泛用于中间跨度桥梁，因为它们使桥梁快速且易于构建。然而，这种桥的强度和可力可操作性可以通过剪切键处的关节降解引起的负载传递和剪切电阻的效率降低来损害。由于其优越的机械性能和提高耐用性，提出了超高性能混凝土（UHPC）作为消除剪切键降解的替代灌浆材料。在该项目中，仪器和监测了一个单跨的相邻箱梁桥，以研究卡车载荷下的UHPC剪切键的性能。从响应数据中识别了剪切关键性能的主要重要性的参数。开发了桥的有限元（FE）模型，以评估UHPC接头处的负载转移机构的效率。由于UHPC的高粘合强度，UHPC剪切钥匙和横向剪切钢筋完全通过接头完全转移负载。所有负载箱的最大相对位移为0.151毫米（0.00594英寸），不足以对UHPC剪切键接口造成损坏。

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