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Tensile and flexural performance of concrete members reinforced with polypropylene fibers and GFRP bars

机译：用聚丙烯纤维和GFRP棒加固混凝土构件的拉伸和弯曲性能

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In the present study, an experimental program was carried out to evaluate the influence of the addition of 10 kg/m(3) of polypropylene (PP) fibers on the tensile and flexural behavior of concrete members internally reinforced with GFRP bars. Mechanical characterization and pullout tests were performed to determine the properties of the constituent materials and to characterize their interface. In a structural level, direct tensile and four-point bending tests were performed on prismatic specimens to investigate their mechanical response. Throughout the work, digital image correlation (DIC) was used to monitor deformations, crack openings and spacings. A considerable reduction in cracking width and an increased multiple cracking behavior was observed for specimens with fiber addition. The results show also a significant influence of tension-stiffening for specimens subject to tension and bending, whereas a slight increase in structural ductility was observed for the specimens tested in bending. The tests indicate possible influence of the shear lag effect to the bar stiffness.
机译：在本研究中，进行了实验程序，以评估添加10kg / m（3）个聚丙烯（PP）纤维对用GFRP棒的混凝土构件的拉伸和弯曲行为的影响。进行机械表征和拉出试验以确定组成材料的性质并表征其界面。在结构水平中，对棱镜样品进行直接拉伸和四点弯曲试验，以研究其机械反应。在整个工作中，数字图像相关（DIC）用于监测变形，裂纹开口和间距。对于具有纤维添加的标本，观察到裂化宽度和增加的多裂解行为的显着降低。结果表明，张力加固对受张力和弯曲的试样的显着影响，而在弯曲中测试的标本观察到结构延性的略微增加。该测试表明剪切滞后效应对条刚度的可能影响。

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