建筑钢结构进展2025，Vol.27Issue(2)：9-20,12.DOI:10.13969/j.jzgjgjz.20230913003
钢筋钢纤维混凝土梁与钢筋混凝土梁抗火性能试验及对比分析
Fire Resistance Test and Comparative Analysis of Reinforced Steel Fiber Concrete Beams and Reinforced Concrete Beams
摘要
Abstract
To study the fire resistance of reinforced steel fiber concrete beams at high temperatures,fire tests and finite element simulations were conducted on reinforced steel fiber concrete beams and ordinary reinforced concrete beams with identical cross-sectional dimensions and reinforcement.The test results showed that ordinary reinforced concrete beams exhibited shear-dominated flexural-shear failure with brittle characteristics,while reinforced steel fiber concrete beams exhibited flexural failure with ductile characteristics.The critical temperature of reinforced steel fiber concrete beams was 594℃,representing a 9%increase compared to ordinary reinforced concrete beams(545℃).At the critical state,the reinforced steel fiber concrete beams exhibited larger mid-span deflection,more extensive development of bending cracks,and wider crack width,but smaller crack spacing and more derived cracks between primary cracks.Additionally,numerical investigations indicated that adding steel fibers can enhance the overall integrity of concrete,making it more uniformly loaded.The flexural stiffness of the reinforced steel fiber concrete beams increases as the steel fiber content increases.The analysis of mechanical properties of reinforced steel fiber concrete beams with different volumes of fibers shows that when the volume content of steel fiber is 1.0%,the deflection of reinforced steel fiber concrete beams is more fully developed.Increasing the reinforcement ratio can enhance the initial stiffness of reinforced steel fiber concrete beams.However,beyond a certain value,further increasing the reinforcement ratio does not significantly contribute to improving their flexural stiffness and instead,results in reduced efficiency of steel reinforcement utilization.关键词
钢纤维/钢纤维混凝土梁/抗弯性能/抗火试验/高温Key words
steel fiber/steel fiber concrete beam/flexural behavior/fire test/high temperature分类
建筑与水利引用本文复制引用
周焕廷,陈建平,邹有云..钢筋钢纤维混凝土梁与钢筋混凝土梁抗火性能试验及对比分析[J].建筑钢结构进展,2025,27(2):9-20,12.基金项目
国家自然科学基金(52378533) （52378533）
