复合材料科学与工程Issue(2)：12-19,8.DOI:10.19936/j.cnki.2096-8000.20250228.002
高温环境对混凝土内GFRP筋拉伸性能退化影响
Effect of high temperature environment on degradation of tensile properties of GFRP bars in concrete
摘要
Abstract
Tensile tests of glass fiber reinforced polymer(GFRP)bars embedded in concrete were carried out after high temperature.The variations of temperature difference between the inner and external locations of concrete specimen and the appearance changes of GFRP bars were analyzed.The degradation of tensile properties of GFRP bars was discussed and the prediction method of the tensile strength retention coefficient of GFRP bars in concrete after high temperature was proposed.The test and analysis results show that there is an obvious temperature lag phe-nomenon of GFRP bars placed in concrete.The temperature at the surface of GFRP bar can reach the operating tem-perature after about 2 h of heating in the furnace.The cover concrete can reduce the degree of looseness of the inter-nal bars after high temperature and its protective effect on the tensile strength retention of GFRP bars is more obvious under the operating temperature of 300～350℃.When the operating temperature reaches 400℃,the tensile prop-erties of GFRP bars decrease rapidly and the protective effect of cover concrete on the thermal insulation gradually weakens to disappear.Under the condition of 300℃,the constant temperature time has significant influence on the tensile strength of GFRP bars in concrete,but has little influence on its elastic modulus.Boltzmann's function can be adopted to effectively predict the tensile strength retention of GFRP bars in concrete after high temperatures.The related research can provide references for the fire-resistant design of GFRP bars in concrete structures.关键词
玻璃纤维增强复合材料(GFRP)/高温环境/混凝土/拉伸性能/预测模型Key words
glass fiber reinforced composite(GFRP)/high temperature environment/concrete/tensile prop-erty/prediction model引用本文复制引用
陆春华,李朝晖,漆仲浩,朱学武,徐奕帆..高温环境对混凝土内GFRP筋拉伸性能退化影响[J].复合材料科学与工程,2025,(2):12-19,8.基金项目
国家自然科学基金(51878319) （51878319）
国家自然科学基金(51578267) （51578267）
