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Size effect on post-cracking strength of high performance fibre-reinforced concrete

機譯：尺寸效應對高性能纖維混凝土抗裂后強度的影響

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The size effect is a well-known phenomenon in the design of reinforced\udconcrete structures. Although it has been studied extensively for conventional\udconcrete with or without traditional reinforcement, its influence on the\udpost-cracking behaviour of fibre-reinforced composites is scarcely reported in\udliterature. This is particularly true in the case of high performance\udfibre-reinforced concrete (HPFRC), which allows the design of very thin elements\udand whose behaviour may be highly influenced by their size. The aim of\udthis research was to evaluate the influence of the size of HPFRC beams on the\udmechanical performance at a cross-sectional level. An experimental program\udinvolving three-point bending tests of HPFRC on beams of dimensions\ud40 40 160, 100 100 400 and 150 150 600 mm was conducted.\udThree steel fibre contents were investigated: 90, 140 and 190 kg/m3\ud. These\udbending tests were also simulated via a sectional analysis model, taking as a\udreference the constitutive law described in the fib Model Code for Concrete\udStructures 2010. The results suggest that the values of stress in the constitutive\udmodel should depend upon the cross-sectional size of the beam. This is reflected\udwhen adjusting the parameters of the MC2010 to fit the experimental values,\udresulting in a coefficient of determination above 0.88 when comparing the ratio\udbetween these two parameters and the size of the cross section.
機譯：在鋼筋混凝土結(jié)構(gòu)設計中，尺寸效應是眾所周知的現(xiàn)象。盡管已對帶有或不帶有傳統(tǒng)增強材料的常規(guī)\混凝土進行了廣泛的研究，但在文獻中卻很少報道其對纖維增強復合材料的\\開裂行為的影響。在高性能\超纖維增強混凝土（HPFRC）的情況下尤其如此，這允許設計非常薄的單元，其行為可能受到其尺寸的很大影響。本研究的目的是在橫截面水平上評估HPFRC梁的尺寸對本力學性能的影響。進行了實驗程序\對HPFRC的三點彎曲試驗進行了尺寸\ ud40 40 160、100 100 400和150150600 mm的梁的試驗。\ ud研究了三種鋼纖維含量：90、140和190 kg / m3 \ ud 。還通過截面分析模型模擬了這些\抗彎試驗，以\ fib《混凝土\ udStructures 2010規(guī)范模型》中描述的本構(gòu)定律作為參考。結(jié)果表明，本構(gòu)\ ud模型中的應力值應取決于梁的橫截面尺寸。這在調(diào)整MC2010的參數(shù)以適合實驗值時反映出來，當比較這兩個參數(shù)之間的比率與橫截面尺寸時得出的確定系數(shù)大于0.88。

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