A coupled dynamic cohesive zone model for FRP-concrete mixed-mode separation
A coupled dynamic cohesive zone model for FRP-concrete mixed-mode separation
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DOI：
10.1016/j.compstruct.2021.113872
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发表时间：
2021-04-16
影响因子：
6.3
通讯作者：
May, Michael
中科院分区：
文献类型：
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作者：
Li, Gen;Tan, Kang Hai;May, Michael
内聚区模型（CZMs）已被用于模拟复合材料断裂，金属粘附失效，混凝土开裂和其他断裂情况。在这些应用中，CZM被广泛地分为纯模式断裂的非耦合模型和混合模式断裂的耦合模型，该模型结合了模式I和模式II特性。各种耦合的动态CZM已被提供用于动态断裂问题。然而，一个耦合CZM FRP-混凝土粘结界面仍然缺乏。这种粘结界面具有I型和II型断裂的不同牵引分离性能，以及动态增强效应。为了弥补这一差距，目前的研究提出了一个耦合的动态CZM分析FRP-混凝土混合模式分离。主要目的是评估模型的反应，在各种混合模式比，包括应力分离曲线和能量耗散。通过单搭接剪切试验、三点弯曲试验和FRP加固钢筋混凝土梁的动态分离试验，验证了模型的有效性。随后，该模型被应用于有限元分析（FEA）的FRP加固钢筋混凝土墙在爆炸场景下。通过与试验结果的比较，表明该模型在模拟FRP-混凝土混合模式分离行为方面是可靠和准确的。
Cohesive zone models (CZMs) have been used to model composite fracture, metal adhesion failure, concrete cracking and other fracture scenarios. In these applications, CZMs are broadly classified into uncoupled models for pure mode fracture and coupled models incorporating mode I and mode II characteristics for mixed-mode fracture. Various coupled dynamic CZMs have been provided for dynamic fracture problems. However, a coupled CZM for FRP-concrete bond interface is still lacking. Such a bond interface contains diverse tractionseparation performance in mode I and mode II fracture, as well as dynamic enhancing effect. To bridge this gap, current study proposed a coupled dynamic CZM to analyse FRP-concrete mixed-mode separation. The main objective was to evaluate model response under various mixed-mode ratios, including stress-separation curves and energy dissipation. The model was validated by various FRP-concrete dynamic separation tests, e.g. single-lap shear tests, three-point bending tests and FRP strengthened reinforced concrete (RC) beam subjected to a dynamic loading. Subsequently, the model was applied in finite element analysis (FEA) of an FRP strengthened RC wall under blast scenarios. From the comparison with the test results, the model was shown to be reliable and accurate in simulating the behaviour of FRP-concrete mixed-mode separation.