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Modeling of shear mechanisms and strength of concrete deep beams reinforced with FRP bars

机译：FRP筋混凝土深梁抗剪机理及强度建模

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摘要

With the growing application of concrete structures reinforced with fiber reinforced polymer (FRP) composite materials, it is necessary to develop more rational mechanical models for their load-carrying capacity evaluation. Firstly, this study numerically analyzed the influences of differences in bond behavior and axial stiffness between FRP and steel bars on the shear behavior of concrete deep beams. It was identified the reinforcement stiffness is the main influencing factor, and an explanation on how the reinforcement stiffness influences the shear performance of deep beams at the mechanism-level was also provided. On this basis, a mechanical cracking strut-and-fie model (CSTM), which theoretically considered the effect of the critical shear crack on the diagonal strut capacity, was proposed to predict shear mechanisms and strength of concrete deep beams reinforced with FRP bars. The proposed CSTM was verified by a shear database of 52 existing tests and compared with predictions of other models. In addition, for purpose of practical design, a simplified CSTM was proposed and verified to be superior to the shear models of CSA S086-12 and ACI 440.1R-15 in terms of safety margin and accuracy.
机译：随着纤维增强聚合物（FRP）复合材料增强的混凝土结构的日益广泛的应用，有必要建立更加合理的力学模型来评估其承载能力。首先，本研究数值分析了FRP和钢筋之间的粘结性能和轴向刚度差异对混凝土深梁的抗剪性能的影响。可以确定加固刚度是主要影响因素，并提供了有关加固刚度如何在机构级别影响深梁抗剪性能的解释。在此基础上，提出了机械开裂支撑模型，其理论上考虑了临界剪切裂缝对对角支撑能力的影响，从而预测了FRP筋加固的混凝土深梁的剪切机理和强度。所提议的CSTM已通过52个现有测试的剪切数据库进行了验证，并与其他模型的预测进行了比较。此外，出于实际设计的目的，提出了简化的CSTM，并在安全裕度和准确性方面优于CSA S086-12和ACI 440.1R-15的剪切模型。

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