A Mesoscale Simulation of the FRP-to-concrete Interfacial Debonding Propagation Process by 3D RBSM
A Mesoscale Simulation of the FRP-to-concrete Interfacial Debonding Propagation Process by 3D RBSM
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DOI：
10.1016/j.compstruct.2022.116336
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发表时间：
2022-10
影响因子：
6.3
通讯作者：
C. Jiang;Kumar Avadh;K. Nagai
中科院分区：
文献类型：
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作者：
C. Jiang;Kumar Avadh;K. Nagai
尽管对纤维增强聚合物(FRP)加固混凝土结构进行了广泛的研究，但可靠的数值模拟仍然是此类结构分析的主要挑战之一。本文在三维刚体弹簧模型(RBSM)的基础上，建立了合理的FRP-混凝土模型。这是首次将FRP引入到三维RBSM中来研究键合问题。提出的模型中的所有参数都具有明确的物理意义和简单的计算方法。模拟结果与试件试验结果和解析解吻合较好。基于所提出的模型，对粘结-混凝土界面强度和宽度系数的影响进行了参数研究。模拟结果揭示了粘结-混凝土界面强度与破坏模式之间的关系。从仿真结果中还发现，宽度因子存在一个上限，而现有的所有模型都忽略了这个上限。当混凝土宽度(BC)大于一定值(例如，本文中的FRP宽度(BF)+0.30 mm)时，由于宽度系数而导致的粘结增加不显著。
Although there are extensive investigations on fiber reinforced polymer (FRP)-strengthened concrete structures, reliable numerical simulation is still one of the major challenges in the analysis of such structures. This paper has successfully developed a rational FRP-to-concrete model based on the 3D rigid body spring model (RBSM). This is the first work to study the bond problem by involving FRP in the 3D RBSM. All the parameters in the developed model are proposed with clear and precise physical meanings and straightforward calculation methods. The simulation results are in good agreement with both the results of tested specimens and analytical solutions. Based on the proposed model, parametric studies are conducted to study the effects of the adhesive-concrete interfacial strength and width factor. From the simulation results, the relationship between the adhesive-concrete interfacial strength and failure mode is revealed. It is also found from the simulation results that the width factor has an upper limit, which is ignored by all the existing models. When the concrete width (bc) is greater than a certain value (e.g., FRP width (bF) + 30 mm in this work), the bond increase due to the width factor is insignificant.