SOME ASPECTS OF TESTING FIBRE-REINFORCED POLYMER BARS UNDER SUSTAINED AND DYNAMIC LOADS AND VARIOUS EXPOSURES
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Abstract
The physical-mechanical and rheological properties of fibre-reinforced polymer bars (FRP bars) have been studied predominantly under short-term static loading. In real-world operation, reinforced concrete structures are subjected to a complex combination of various factors, including sustained loads, cyclic dynamic loads (including fully reversed), temperature effects, and exposure to aggressive environments. Russian regulatory documents for the design of reinforced concrete structures partially account for these factors using generalized reduction factors. Standard test methods for determining the combined influence of these factors on the properties of FRP bars are currently lacking.
The aim of this research is to identify a number of features in the preparation and implementation of tests to assess the combined influence of operational factors on the strength and deformation characteristics of FRP bars. The paper presents the prerequisites for developing a test program to study the behavior of reinforcement under long-term static loading under conditions of elevated temperature and alkaline environment of concrete, as well as under repeatedly applied dynamic load (including the fully reversed «compression-tension» mode) with varying cycle parameters. The goal is to derive analytical relationships and diagrams for the long-term strength and fatigue strength of FRP bars, which consider the influence of temperature, aggressive environment, and loading cycle parameters.
The obtained results form the basis for a comprehensive program of experimental research, the development of test methods, and the prediction of the behavior of FRP bars in real-world operating conditions as part of concrete structures. They enable a transition from using generalized coefficients to calculations that account for specific exposures. This is a key step towards improving the regulatory framework and designing reliable, durable, and safe reinforced concrete structures with FRP bars.
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