Time–temperature analysis of bond strength of a rebar after fire exposure

摘要: Abstract The extent of damage to a steel-reinforced concrete structure due fire exposure must be evaluated before deciding whether reuse, reinforce, or abandon the structure. Understanding long-term effects high temperature on structures is also important for predicting service life in high-temperature environment. These include changes strength, stiffness, toughness, bond strength rebar, and so on. change rebars studied herein. experimental results postfiring pullout tests show substantial decrease if reaches 200 °C higher. current investigation proposes procedure, based single function, calculate residual rebar constant fluctuating temperatures. This forecasting method termed temperature–time analysis offers excellent agreement with results.