【摘要】：由于FRP筋為非金屬材料,耐腐蝕性能好,我國規(guī)范規(guī)定FRP配筋混凝土受彎構件的最大裂縫寬度限值放寬至0.5 mm。但規(guī)范中的最大裂縫寬度計算公式仍然沿用普通鋼筋混凝土規(guī)范中的計算公式,公式中的參數(shù)取值未經(jīng)過試驗數(shù)據(jù)的校核,公式適用性存疑。為此,該文從最大裂縫寬度的計算原理出發(fā),借助近年來文獻中完成的FRP筋混凝土受彎構件的實測數(shù)據(jù),對相對黏結特性系數(shù)νi的取值、裂縫間受拉FRP筋應變不均勻系數(shù)ψ的計算、最大裂縫寬度與平均裂縫寬度的比值系數(shù)τs、長期荷載下的裂縫寬度增大系數(shù)τl以及裂縫間混凝土受拉對裂縫寬度的影響系數(shù)αc等進行了全面的校核和修訂。該文提出的修正的最大裂縫寬度計算公式具有更高的可信度和合理性,可為我國規(guī)范的修訂提供參考。
[Abstract]:Because FRP bars are non-metallic materials and have good corrosion resistance, the maximum crack width limit of concrete flexural members reinforced with FRP bars is relaxed to 0.5 mm. according to the code of our country. However, the formula for calculating the maximum crack width in the code is still the formula in the ordinary reinforced concrete code, and the parameters in the formula are not checked by the test data, so the applicability of the formula is doubtful. Based on the calculation principle of maximum crack width and the measured data of FRP reinforced concrete flexural members completed in recent years, the relative adhesion characteristic coefficient of FRP reinforced concrete flexural members is obtained. Calculation of strain inhomogeneity coefficient 蠄 of tensile FRP tendons between cracks, The ratio coefficient 蟿 s of the maximum crack width to the average crack width, the increasing factor 蟿 l of the crack width under long term load and the influence coefficient 偽 c of the concrete tension between cracks on the crack width are comprehensively checked and revised. The modified formula for calculating the maximum crack width is more reliable and reasonable, which can be used as a reference for the revision of the code in China.
【作者單位】： 東南大學混凝土及預應力混凝土結構教育部重點實驗室;東南大學國家預應力工程技術研究中心;
【基金】：國家自然科學基金(51528802) 澳大利亞ARC基金(DP160100739) 東南大學優(yōu)秀博士學位論文培育基金(YBPY1607)
【分類號】：TU377.9

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本文編號：2259820