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首页> 外文期刊>Engineering Fracture Mechanics >Strengthening mechanism of channel steel plate for notched concrete beams against fracture: Test and numerical study
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Strengthening mechanism of channel steel plate for notched concrete beams against fracture: Test and numerical study

机译：脱裂混凝土梁通道钢板的强化机理：试验和数值研究

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Concrete structures are intentionally built with notches or incomplete joints in many engineering practices to deal with complex loading conditions. It is of great significance to improve the crack resistance and the installation of a channel steel plate ahead of the purpose-built notch (or joint) tip may serve such a purpose. This paper presents an investigation into the strengthening mechanism of installing a channel steel plate at the head of a notch for concrete beams against opening mode fracture failure. Both test and numerical studies have been undertaken and particular attention is given to the effects of key factors on the load carrying capacity and the failure pattern. Two types of three-point bending tests were conducted on concrete beams with or without channel steel plate reinforcement for a comparison study. The test results demonstrated the capability of channel steel plate measure for increasing the beam load capacity, and the interface debonding and matrix cracking were responsible for the eventual failure of reinforced concrete beams. Correspondingly, finite element based numerical models were established to investigate the progressive cracking in test beams and the strengthening mechanism by the installation of a steel plate. A damage-plasticity material model was used for simulating the cracking development in concrete, whilst two different approaches were adopted for the steel concrete interface modelling: one assumed a perfect bond while the other incorporated a discrete thin layer of interface to allow for potential debonding and slippage. A comparison between the numerical and test results was given, and the effects of key factors on the performance of beams with steel plate measure were investigated through parametric numerical studies. The paper ends with some discussions on the strengthening mechanism and conclusions. (C) 2017 Elsevier Ltd. All rights reserved.
机译：在许多工程实践中，在许多工程实践中有故意建造混凝土结构，以处理复杂的装载条件。提高裂缝电阻和在目的内置的凹口（或接合）尖端之前的抗裂纹钢板的安装是具有重要意义，可以用于这种目的。本文提出了对在凹口的主管头部安装通道钢板的强化机制，以防止打开模式断裂衰竭。已经进行了测试和数值研究，并且特别注意了关键因素对承载能力和失效模式的影响。在具有或不带通道钢板增强的混凝土梁上进行两种类型的三点弯曲试验，用于对比较研究。测试结果证明了通道钢板测量的能力，用于增加光束负载容量，界面剥离和矩阵裂纹负责钢筋混凝土梁的最终失效。相应地，建立了基于有限元的数值模型，以研究试验梁和通过安装钢板的渐进式机构。损坏可塑性材料模型用于模拟混凝土中的开裂开发，而钢混凝土界面建模采用两种不同的方法：一个假设一个完美的粘合，而另一个结合了一个离散的薄层界面，以允许潜在的剥离和滑移。给出了数值和测试结果之间的比较，通过参数数学研究研究了关键因素对钢板测量梁梁性能的影响。纸张结束了一些关于加强机制和结论的讨论。 （c）2017 Elsevier Ltd.保留所有权利。

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