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Experimental study on Steel Fiber Reinforced Concrete and Reinforced Concrete elements under concentrated loads
Construction and Building Materials ( IF 7.4 ) Pub Date : 2021-09-23 , DOI: 10.1016/j.conbuildmat.2021.124834
Ivan Trabucchi 1 , Giuseppe Tiberti 1 , Antonio Conforti 1 , Filippo Medeghini 2 , Giovanni A. Plizzari 1
Affiliation  

Concrete elements subjected to high compressive loads applied over a small contact area is a typical engineering problem. The partially loaded area leads to high compressive stresses underneath the loading zone, that can cause crushing failure, and tensile transverse stresses, which could provoke splitting failure. Rebars are typically adopted by designers in Reinforced Concrete (RC) solutions to cope with these tensile stresses. However, there is a growing interest in reinforcement solutions based on Fiber Reinforced Concrete (FRC). Within this framework, a broad experimental program was carried out to shed new lights on the behavior of Steel Fiber Reinforced Concrete (SFRC) specimens subjected to partially loaded area and to compare their structural performance against RC samples. Prismatic elements reinforced either by reinforcing bars or different steel fiber types and amount were subjected to a load applied over a partial area. Different casting directions, favoring different fiber orientations, were considered as well. The goal is to evaluate the crack control promoted by fibers and the different failure mechanisms of SFRC samples. Results confirmed both the ability of steel fibers to increase the splitting bearing capacity and the importance of fiber orientation. SFRC characterized by a proper post-cracking performance can move the collapse from splitting to crushing and provide a cracking control similar to RC specimens.



中文翻译:

集中荷载作用下钢纤维混凝土及钢筋混凝土构件试验研究

混凝土构件在小接触面积上承受高压缩载荷是一个典型的工程问题。部分加载区域导致加载区域下方的高压缩应力,这可能导致压碎破坏和横向拉伸应力,这可能会引发分裂失败。设计师通常在钢筋混凝土 (RC) 解决方案中采用钢筋来应对这些拉伸应力。然而,人们对基于纤维增强混凝土 (FRC) 的增强解决方案越来越感兴趣。在此框架内,开展了一项广泛的实验计划,以揭示钢纤维混凝土 (SFRC) 试样在部分加载区域的行为,并将其结构性能与 RC 试样进行比较。通过钢筋或不同类型和数量的钢纤维增强的棱柱形元件承受施加在局部区域上的载荷。不同的浇铸方向,有利于不同的纤维取向,也被考虑在内。目标是评估纤维促进的裂纹控制和 SFRC 样品的不同失效机制。结果证实了钢纤维增加劈裂承载力的能力和纤维取向的重要性。SFRC 以适当的后开裂性能为特征,可以将坍塌从分裂转移到压碎,并提供类似于 RC 试样的开裂控制。目标是评估纤维促进的裂纹控制和 SFRC 样品的不同失效机制。结果证实了钢纤维增加劈裂承载力的能力和纤维取向的重要性。SFRC 以适当的后开裂性能为特征,可以将坍塌从分裂转移到压碎,并提供类似于 RC 试样的开裂控制。目标是评估纤维促进的裂纹控制和 SFRC 样品的不同失效机制。结果证实了钢纤维增加劈裂承载力的能力和纤维取向的重要性。SFRC 以适当的后开裂性能为特征,可以将坍塌从分裂转移到压碎,并提供类似于 RC 试样的开裂控制。

更新日期:2021-09-23
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