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首页> 外文期刊>Arabian Journal for Science and Engineering >Nominal Flexural Strength of High Strength Fiber Reinforced Concrete Beams
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Nominal Flexural Strength of High Strength Fiber Reinforced Concrete Beams

机译：高强度纤维混凝土梁的标称抗弯强度

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摘要

This paper presents the development of simple semi-empirical formulae for the analysis of nominal flexural strength of high strength steel fiber reinforced concrete (HSFRC) beams. Such developed formulae were based on strain compatibility and equilibrium conditions for fully and partially HSFRC sections in joint with suitable idealized compression and tension stress blocks. The stress blocks were given by suitable empirical functions for the compressive and post-cracking strengths of HSFRC. The enhancement in compressive strength due to fibers inclusion is proposed as a function of concrete matrix strength and fiber reinforcing index. To account for the pullout resistance of fibers in tension, the post-cracking strength was evaluated as a function of fiber reinforcing index and bond strength. The fiber reinforcing index was considered as a function of volume content, aspect ratio, orientation and length efficiency factors of the fibers. In view of the degenerative nature of the pullout resistance of the fibers with the increase of crack width, a limit was placed on the useful tensile strain extent, depending on fiber length and crack spacing. It was found that there is a good agreement between the flexural strengths for HSFRC beams predicted by the proposed formulae and the experimental results reported in the literature, while the predicted flexural strengths as computed by ACI Committee 544.4R (ACI Struct J 85:563-580,1988) and ACI Committee 544.1R (ACI Struct J 94:1-66,1997) were very conservative. The parametric studies indicate that the nominal moment section capacity increases with the increase of fiber content and fiber aspect ratio.
机译：本文介绍了用于分析高强度钢纤维增强混凝土（HSFRC）梁的标称抗弯强度的简单半经验公式。这样开发的公式是基于应变相容性和全部和部分HSFRC截面的平衡条件，并结合了合适的理想压缩和拉伸应力块。通过HSFRC的抗压强度和开裂后强度的适当经验函数给出了应力块。提出了由于包含纤维而导致的抗压强度的提高与混凝土基体强度和纤维增强指数的关系。为了说明纤维在拉伸中的抗拔出性，将断裂后的强度作为纤维增强指数和粘结强度的函数进行评估。纤维增强指数被认为是纤维的体积含量，纵横比，取向和长度效率因子的函数。考虑到纤维的抗拉拔性随着裂缝宽度的增加而具有退化性质，因此根据纤维长度和裂缝间距对有用的拉伸应变程度进行了限制。已经发现，由拟议的公式预测的HSFRC梁的抗弯强度与文献报道的实验结果之间有很好的一致性，而由ACI委员会544.4R（ACI Struct J 85：563- 580，1988）和ACI委员会544.1R（ACI Struct J 94：1-66，1997）是非常保守的。参数研究表明，名义矩截面容量随纤维含量和纤维长径比的增加而增加。

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