Abstract
Various materials and reinforcement technologies have been created for concrete structures. However, there is no uniform methodology to compare the mechanical characteristics of different reinforcement systems. In structural systems, residual stiffness can estimate the efficiency of the reinforcement. This study introduces a simplified approach for the flexural stiffness analysis. It employs a new testing layout designed with the purpose to form multiple cracks in a small laboratory specimen. The achieved solution requires neither iterative calculations nor a description of the loading history. Several composite reinforcement schemes, including internal glass fibre reinforced polymer (GFRP) bars, carbon fibre reinforced polymer (CFRP) sheets and near-surface mounted (NSM) strips are considered. The analysis of the test results reveals a substantial efficiency of the external CFRP reinforcement systems.
Highlights
Various materials and reinforcement technologies have been created for concrete structures, but there is no uniform methodology to compare the mechanical characteristics of different reinforcement systems
The slab-shaped beam specimens have an identical rectangular cross-section of the concrete that was reinforced with internal bars, near-surface mounted (NSM) carbon fibre reinforced polymer (CFRP) strips, or external bond reinforcement (EBR) using CFRP sheets
Deformations and crack pattern of the side surface of the specimen were fixed with the help of digital image correlation system (DIC)
Summary
Various materials and reinforcement technologies have been created for concrete structures, but there is no uniform methodology to compare the mechanical characteristics of different reinforcement systems. The development of more reliable algorithms employed the reinforcement-related tension-stiffening concept was the consequence of the further improvements (Kaklauskas et al, 2011; Torres et al, 2015; Kaklauskas & Gribniak, 2016) Such models, are not useful for the analysis of the elements reinforced with a combination of different types of composite reinforcement. A new testing procedure was developed to estimate residual flexural stiffness of the concrete elements with composite reinforcement systems. Representing a closed-form solution of the flexural stiffness problem, the proposed analytical model requires neither iterative calculations nor a description of the loading history. The application of this technique is illustrated experimentally. Sultani et al Comparative analysis of flexural stiffness of concrete elements with different types of composite
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