Bond behavior simulation of deformed rebar in fiber-reinforced cementitious composites using three-dimensional meso-scale model
Bond behavior simulation of deformed rebar in fiber-reinforced cementitious composites using three-dimensional meso-scale model
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DOI：
10.1016/j.cemconcomp.2022.104589
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发表时间：
2022-05
影响因子：
10.5
通讯作者：
A. Sarraz;Hikaru Nakamura;T. Kanakubo;T. Miura;H. Kobayashi
中科院分区：
文献类型：
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作者：
A. Sarraz;Hikaru Nakamura;T. Kanakubo;T. Miura;H. Kobayashi
纤维增强胶凝复合材料（FRCC）具有较高的抗拉能力和应变能力，能有效地发挥变形钢筋的粘结延性。提出了一种基于三维刚体弹簧模型（3D RBSM）的钢筋混凝土混凝土变形钢筋粘结性能的数值计算方法。采用梁单元对钢筋进行建模，采用连接单元以RBSM单元为矩阵连接梁单元。在普通砂浆和FRCC两种模拟情况下，钢筋在连接单元处均具有相同的局部粘结滑移关系。该模型能较好地模拟单纤维对FRCC的受力行为和钢筋在FRCC中的粘结性能。结果表明，分散纤维是阻止裂裂粘结裂纹扩展的主要因素，应力扩展表明钢筋周围存在较高的局部粘结应力，提高了粘结延性。
Fiber-reinforced cementitious composites (FRCC) can effectively develop the bond ductility of deformed rebar due to the high tensile resistance and strain capacity. This study presents a numerical method to evaluate the bond behavior of deformed rebar in FRCC based on 3D rigid body spring model (3D RBSM). Beam elements are used to model the rebar and the link elements are used to connect beam elements with RBSM elements as matrix. The same local bond-slip relationship for rebar is assigned at the link elements for both the simulation cases of plain mortar and FRCC. The model could properly simulate the single fiber to mechanical behavior of FRCC and the bond performance of rebar in FRCC. The results revealed that discrete fibers are the principal factors that preventing the splitting bond crack propagation and the stress propagation suggests the presence of high local bond stress around the rebar, improving bond ductility.