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首页> 外文期刊>Journal of bridge engineering >Simplified Design Method for the Shear Capacity of Steel Plate Shear-Strengthened Reinforced-Concrete Beams
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Simplified Design Method for the Shear Capacity of Steel Plate Shear-Strengthened Reinforced-Concrete Beams

机译：钢板剪力钢筋混凝土梁抗剪承载力的简化设计方法

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摘要

Recently, a steel plate concrete composite technique has been developed for the shear strengthening of RC bridges. The steel plate shear-strengthened (SPSS) beam is composed of an old RC beam, new concrete, and steel web. To investigate the shear behavior of SPSS beams strengthened in the shear span, six SPSS beams and four RC beams were tested. The test results showed that the failure mode of the SPSS beams was peeling failure at the interface between the old concrete and new concrete. The proposed technique showed a significantly enhanced shear capacity even when the tensile strength of the interface between the old and new concrete was relatively low. The initial interface failure appeared at the loading point, support, and corner of the new concrete and then expanded to the entire shear span. A finite-element (FE) model of the SPSS beam was established with the use of the FE software MSC.Marc, and the cohesive element was used to model the interface between the old and new concrete. The modeling scheme, material constitutive law, and material parameters are illustrated in this article. The results of the proposed FE model were found to agree fairly well with the test results in terms of the overall load-displacement curve, ultimate shear capacity, and interface failure pattern. Based on the FE model, the shear force contribution of the old concrete, new concrete, and steel web were decomposed with sufficient accuracy. The effects of the ratio of shear span to depth, material strength, and interface strength were investigated by an FE parametric analysis, and the interface strength between the old and new concrete was found to be the most important parameter. The shear contribution of the steel web was mainly affected by the interface strength. Finally, 1,296 elaborate FE models of SPSS beams were established with the use of MSC.Marc, and a practical design formula considering peeling failure with a reasonable level of accuracy was developed.
机译：近来，已开发出一种钢板混凝土复合技术，用于钢筋混凝土桥梁的抗剪加固。钢板抗剪加固（SPSS）梁由旧的RC梁，新的混凝土和钢网组成。为了研究在剪切跨度中加强的SPSS梁的剪切特性，测试了6条SPSS梁和4条RC梁。试验结果表明，SPSS梁的破坏模式为新旧混凝土界面处的剥离破坏。即使新旧混凝土之间的界面抗拉强度相对较低，所提出的技术仍显示出显着增强的剪切能力。最初的界面破坏出现在新混凝土的加载点，支撑和拐角处，然后扩展到整个剪切跨度。利用有限元软件MSC.Marc建立了SPSS梁的有限元模型，并利用内聚元对新旧混凝土的界面进行建模。本文说明了建模方案，材料本构定律和材料参数。结果表明，所提出的有限元模型的结果在整体荷载-位移曲线，极限抗剪承载力和界面破坏模式方面与测试结果相当吻合。基于有限元模型，以足够的精度分解了旧混凝土，新混凝土和钢网的剪力。通过有限元参数分析研究了剪跨比与深度，材料强度和界面强度之比的影响，发现新旧混凝土之间的界面强度是最重要的参数。钢网的剪切贡献主要受界面强度影响。最后，利用MSC.Marc建立了1,296个精细的SPSS梁有限元模型，并提出了一种考虑合理剥离精度的实用设计公式。

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