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Hydromechanical couplings of reinforced tensioned members of steel fiber reinforced concrete by dual lattice model
International Journal for Numerical and Analytical Methods in Geomechanics ( IF 4 ) Pub Date : 2020-09-28 , DOI: 10.1002/nag.3148
Duc Tho Pham 1, 2 , Luca Sorelli 1 , Mario Fafard 1 , Minh‐Ngoc Vu 3
Affiliation  

The durability of concrete structures strongly depends on the water and chloride penetration in cracked concrete during its service life. This work aims at modeling the damage effect of tension stiffening behavior on the permeability for concrete tie specimen under tensile load by a dual lattice model, which considers hydromechanical couplings. Three concrete materials, including normal strength concrete (NSC), steel fiber reinforced concretes (SFRC), and ultra high‐performance fiber reinforced concrete (UHPFRC), are considered. The hydromechanical lattice model is based on a dual element network modeling: the water transport and the mechanical response. The fiber bridging effect is considered by means of the cohesive law of Mazars. The water flow in the damaged conduit elements is proportional to the cube of the crack width, which results from the damage variable. Experimental results available in open literature for both NSC and SFRC tie specimens are used to analyze and validate the proposed model. Considering a UHPFRC tie specimen, the model well predicted the load drops due to macrocrack occurrence, load hardening, and permeability evolution. Based on the present results, the current lattice hydromechanical model is a useful tool for predicting the service life of steel bar reinforcing concrete structure with and without steel fiber reinforcement.

中文翻译:

钢纤维混凝土钢筋张拉构件的双重网格水力耦合。

混凝土结构的耐用性在很大程度上取决于裂缝混凝土在其使用寿命期间的水和氯化物渗透性。这项工作的目的是通过考虑水力耦合的双晶格模型来模拟拉伸加劲行为对混凝土拉力试样在渗透性下的渗透性的破坏作用。考虑了三种混凝土材料,包括普通强度混凝土(NSC),钢纤维增强混凝土(SFRC)和超高性能纤维增强混凝土(UHPFRC)。流体力学晶格模型基于双元素网络模型:水的输送和机械响应。通过马扎斯的内聚法则来考虑纤维的桥接效应。损坏的导管元件中的水流与裂缝宽度的立方成正比,这是由伤害变量引起的。NSC和SFRC连接标本的公开文献中提供的实验结果用于分析和验证所提出的模型。考虑到UHPFRC粘结试样,该模型很好地预测了由于大裂纹的发生,载荷硬化和渗透性演变而引起的载荷下降。基于目前的结果,当前的晶格流体力学模型是预测带有或不带有钢纤维的钢筋混凝土结构使用寿命的有用工具。
更新日期:2020-09-28
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