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首页> 外文期刊>Journal of structural engineering >Flexural Performance of UHPC-Concrete-ECC Composite Member Reinforced with Perforated Steel Plates
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Flexural Performance of UHPC-Concrete-ECC Composite Member Reinforced with Perforated Steel Plates

机译：采用多孔钢板增强UHPC - 混凝土ECC复合构件的弯曲性能

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摘要

A novel reinforced concrete structural member comprising ultrahigh-performance concrete (UHPC) and engineered cementitious composite (ECC) was proposed for use in underground structures, such as prefabricated utility tunnels. In this composite member, UHPC was used as the exterior (i.e., soil side) protective layer to prevent the penetration of water and corrosive agents, and ECC was used as the interior (i.e., service environment side) protective layer to improve the member's crack-control capacity and fire resistance. Ordinary concrete was filled between the UHPC and ECC layers. The composite member was reinforced with perforated steel plates to achieve strong mechanical interaction between the composite materials and to ensure structural integrity. The proposed composite was experimentally characterized as follows. The tension-stiffening effect in ECC panels with a perforated steel plate was evaluated using direct tensile tests. The flexural behavior of the reinforced UHPC-concrete-ECC members was characterized with four-point bending tests. The failure processes of the composite members were analyzed via the digital image correlation (DIC) method. Finally, a simplified theoretical method was developed to estimate the yield and ultimate load-carrying capacities of the composite member, and the estimated results showed good agreement with the test results. Overall, the proposed composite member had favorable mechanical performance and durability due to the strategic use of UHPC and ECC. (C) 2021 American Society of Civil Engineers.
机译：一种新型钢筋混凝土结构构件，包括超高性能混凝土（UHPC）和工程化水泥复合材料（ECC），用于地下结构，例如预制实用隧道。在该复合构件，UHPC用作外部（即，土壤侧）的保护层，以防止水和腐蚀性物质的渗透，和ECC被用作内部（即，服务环境侧）的保护层，以改善部件的裂缝-Control容量和耐火性。普通混凝土填充在UHPC和ECC层之间。复合构件用穿孔钢板加固，以在复合材料之间实现强机械相互作用，并确保结构完整性。所提出的复合材料在实验表征如下。使用直接拉伸试验评价具有穿孔钢板的ECC板中的张力加强效应。增强UHPC - 混凝土 - ECC构件的弯曲行为具有四点弯曲试验。通过数字图像相关（DIC）方法分析复合构件的故障过程。最后，开发了一种简化的理论方法以估计复合构件的产量和最终承载能力，并且估计结果表明符合测试结果。总的来说，由于UHPC和ECC的战略使用，所提出的综合员具有良好的机械性能和耐用性。 （c）2021年美国土木工程师协会。

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