A proposal of Flexural Design Methodology based on Probability for Recycled Aggregate Concrete reinforced by GFRP rebars

Abstract

Research and development of technology for sustainable development are also an important strategy in the concrete field. In this thesis, a study on the use of recycled aggregate for GFRP reinforcement and sustainable recycling of construction waste was conducted. In this study, it is assumed that it replaces the old concrete bridge, and the flexural design method which can secure the reliability when using GFRP rebar and recycled aggregate is proposed. The flow of the research method is as follows. The magnitude of the external load acting on the structure to be replaced was simulated through the FEM. The statistical properties of load and GFRP were selected using the results of previous studies. In order to confirm the statistical properties of concrete using recycled aggregate, the statistical characteristics were calculated by analyzing the data of the compressive strength collected through the literature survey. The limit state function of flexural moment byr the external load and resistance of the structure was set, and the probability distribution was calculated and analyzed by Monte Carlo Simulation reflecting the statistical characteristics of each design variable. GFRP reinforcement ratio corresponding to the target reliability index defined according to the recycled aggregate replacement ratio was derived. The results of this thesis can be used as a basis for further study on the applicability of recycled aggregate to the design code of concrete structure using FRP, although it shows some range of bending design.