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首页> 外文期刊>Journal of structural engineering >New Methodology for Design and Construction of Concrete Members with Complex Stress Fields Using Steel Fiber-Reinforced Concrete
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New Methodology for Design and Construction of Concrete Members with Complex Stress Fields Using Steel Fiber-Reinforced Concrete

机译：钢纤维混凝土用于复杂应力场混凝土构件设计与施工的新方法

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摘要

Reinforced concrete members with significant geometric discontinuities or D-regions experience complex stress fields under loading, which require considerable analytical effort and usually complicated reinforcement detailing. Large openings in RC members can interrupt the direct load transfer provided by concrete struts, thereby leading to overstressed localized regions and unexpected failure modes. Empirically based strut-and-tie models (STMs) are generally used to design the reinforcement detailing of these RC members. However, many prior studies indicate that the resulting details can be very complicated while the actual stress fields deviate significantly from that assumed by STMs, thereby leading to unpredictable failure modes. This study investigates the feasibility of using steel fibers to replace the majority of conventional reinforcing bars in RC deep beams with significant D-regions. The test beams have two large openings, which are located between the loading point and the supports, thus disrupting the direct flow of forces. A simplified procedure is proposed for designing and detailing the reinforcement of steel fiber-reinforced concrete (SFRC) specimens based on the stress fields from elastic finite-element analyses. Experimental results show that when the critical regions of a test specimen were reinforced appropriately by conventional reinforcing bars and the remaining portion of that specimen was reinforced by SFRC with 1.0% volume fraction of fibers, the reinforced SFRC specimen exhibited a ductile failure mechanism with very large plastic deformation. The reinforced SFRC specimens also showed much higher strength than the nominal design load and experienced slow postpeak strength loss. In comparison, although the RC specimen reached very high strength, it also showed an unexpected brittleness and localized failure behavior. This study also shows that finite-element simulation based on the modified compression field theory (MCFT) is able to identify possible failure mechanisms of reinforced SFRC specimens.
机译：具有明显几何不连续性或D区域的钢筋混凝土构件在荷载作用下会遇到复杂的应力场，这需要大量的分析工作和通常复杂的钢筋细节。 RC构件中的大开口会中断混凝土支柱提供的直接载荷传递，从而导致局部区域过应力和意外的破坏模式。通常使用基于经验的支撑-拉杆模型（STM）设计这些RC构件的钢筋细部。但是，许多先前的研究表明，所得结果的细节可能非常复杂，而实际应力场却大大偏离了STM所假定的应力场，从而导致了无法预测的失效模式。这项研究调查了在具有较大D区域的RC深梁中使用钢纤维替代大多数传统钢筋的可行性。测试梁有两个大的开口，它们位于加载点和支撑之间，从而破坏了力的直接流动。根据弹性有限元分析的应力场，提出了一种简化的程序，用于设计和详细说明钢纤维增强混凝土（SFRC）的钢筋。实验结果表明，当用常规钢筋对试样的关键区域进行适当的加固，而剩余部分用纤维体积分数为1.0％的SFRC加固时，增强的SFRC试样表现出很大的延性破坏机理。塑性变形。增强的SFRC样品还显示出比标称设计载荷高得多的强度，并且经历了缓慢的峰后强度损失。相比之下，尽管RC试样达到了很高的强度，但它也显示出意外的脆性和局部破坏行为。这项研究还表明，基于改进的压缩场理论（MCFT）的有限元模拟能够识别增强型SFRC标本的可能破坏机理。

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