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Structural Materials: Identification of the Constitutive Models and Assessment of the Material Response in Structural Elements Strengthened with Externally-Bonded Composite Material

机译：结构材料：本构模型的识别和外部结合复合材料加强的结构元件中材料响应的评估

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摘要

This article investigates the material behavior within multiple-component systems. Specifically, a structural concrete element strengthened to flexure with externally-bonded fiber-reinforced polymer (FRP) material is considered. Enhancements of mechanical performances of the composite structural element resulting from synergies in the framework of the multiple-component system are studied. The research work comprises the determination of the constitutive relations for the materials considered separately as well as the investigation of materials’ response within a complex system such as the composite structural element. The definition of the material models involves a calibration of the model constants based on characterization tests. The constitutive relations are integrated into the finite element model to study the material behavior within the multiple-component system. Results obtained by finite element analysis are compared with experimental results from the literature. The finite element analysis provides valuable information about the evolution of some internal variables, such as mechanical damage accumulation. The material synergies find expression in the load-carrying capacity enhancement and the delay in the damage accumulation in concrete.
机译：本文研究了多组件系统中的材料行为。具体地，考虑了用外部粘结的纤维增强聚合物（FRP）材料加固以弯曲的结构混凝土元件。研究了在多组分系统框架内协同作用导致复合结构元件的机械性能提高。研究工作包括确定单独考虑的材料的本构关系，以及调查复杂系统（例如复合结构元件）中材料的响应。材料模型的定义涉及基于特性测试的模型常数校准。本构关系被集成到有限元模型中，以研究多组分系统中的材料行为。将通过有限元分析获得的结果与文献中的实验结果进行比较。有限元分析提供了有关某些内部变量演变的有价值的信息，例如机械损伤累积。材料的协同作用体现在承载能力的提高和混凝土损伤累积的延迟上。

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