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Influence of longitudinal reinforcement type on the shear strength of reinforced concrete beams without transverse reinforcement.

机译：纵向钢筋类型对没有横向钢筋的钢筋混凝土梁的抗剪强度的影响。

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摘要

Since FRP bars are not susceptible to corrosion, they have emerged as a replacement to steel reinforcement in concrete, with the potential of reducing lifetime costs in applications where corrosion of steel bars causes costly maintenance. However, there may be differences in the behavior of reinforced concrete members reinforced with these materials as compared to steel. The shear design of reinforced concrete members has been based on empirical methods developed from experiments. Considering experimental evidence from steel reinforced concrete shear tests, the use of low longitudinal reinforcement ratios can cause a reduction in shear strength. The use of FRP bars as flexural reinforcement, which produces unusually low longitudinal reinforcement ratios when converted to equivalent steel areas, may yield a similar effect. The investigations conducted here consisted of two phases: an experimental and an analytical. The experimental phase investigated the effect of using FRP bars as longitudinal reinforcement on the shear strength and behavior of rectangular concrete beams without transverse reinforcement. It was determined that when equal areas of tensile reinforcement are provided, FRP bar reinforced concrete beams fail at a lower shear strength than steel reinforced ones. However, when the bending stiffness after flexural cracking was kept constant (concrete strength and rhoeff constant), the shear strength was approximately the same regardless of the reinforcement type used. The analytical phase concentrated on the relationship between the neutral axis depth at cracking and the shear strength of the member. Considering this relationship, a simple analysis method based on mechanics to calculate the concrete contribution to shear strength of rectangular reinforced concrete beams regardless of the longitudinal reinforcement type was developed. The proposed design method was shown to be valid by testing it on a 339-specimen database of rectangular reinforced concrete specimens regardless of the type of flexural reinforcement. Finally, the applicability of the proposed design method in calculating the concrete contribution to the shear strength of members with other cross sectional shapes such as flanged and circular sections was discussed.
机译：由于FRP钢筋不易腐蚀，因此它们已替代混凝土中的钢筋，并有可能在钢筋腐蚀导致维护成本高昂的应用中降低使用寿命成本。然而，与钢相比，用这些材料增强的钢筋混凝土构件的性能可能有所不同。钢筋混凝土构件的剪切设计是基于实验开发的经验方法。考虑到钢筋混凝土剪切试验的实验证据，使用低纵向钢筋比率会导致剪切强度降低。将FRP筋用作抗弯钢筋，当转换为等效钢面积时，会产生异常低的纵向钢筋比率，可能会产生类似的效果。这里进行的研究包括两个阶段：实验阶段和分析阶段。实验阶段研究了使用FRP筋作为纵向钢筋对没有横向钢筋的矩形混凝土梁的抗剪强度和性能的影响。可以确定，当提供相等面积的抗拉钢筋时，FRP钢筋混凝土梁的抗剪强度比钢钢筋低。然而，当弯曲裂纹后的弯曲刚度保持恒定（混凝土强度和rhoeff恒定）时，无论使用何种增强类型，剪切强度都大致相同。分析阶段集中在开裂时的中性轴深度与构件的剪切强度之间的关系上。考虑到这种关系，开发了一种简单的基于力学的分析方法来计算混凝土对矩形钢筋混凝土梁抗剪强度的影响，而与纵向钢筋类型无关。通过在339个矩形钢筋混凝土试样样本数据库中进行测试，证明了所提出的设计方法是有效的，而与抗弯钢筋的类型无关。最后，讨论了所提出的设计方法在计算混凝土对具有其他横截面形状的构件（如法兰和圆形截面）的抗剪强度的适用性。

著录项

  • 作者

    Tureyen, Ahmet Koray.;

  • 作者单位

    Purdue University.;

  • 授予单位 Purdue University.;
  • 学科 Civil engineering.
  • 学位 Ph.D.
  • 年度 2001
  • 页码 232 p.
  • 总页数 232
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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