冻融循环下钢纤维混凝土梁受弯承载力  

Study on Flexural Capacity of Steel Fiber Reinforced Concrete Beams under Freeze-Thaw Cycles

作　　者：易怀书 陈月顺 张玉泽 李传雄 YI Huaishu;CHEN Yueshun;ZHANG Yuze;LI Chuanxiong(School of Civil Engin.,Architecture and Environment,Hubei Univ.of Tech.,Wuhan 430068,China)

机构地区：[1]湖北工业大学土木建筑与环境学院,湖北武汉430068

出　　处：《湖北工业大学学报》2025年第2期92-99,共8页Journal of Hubei University of Technology

摘　　要：为了研究钢纤维混凝土梁在冻融循环后承载力的退化规律,选取1.5 kg/m 3钢纤维掺量的混凝土梁并分析其在经历有限次数的冻融循环后承载力的变化。将C30(2C14)、C40(2C16)两种类型的钢纤维混凝土梁进行50、100、150次的冻融循环试验。通过对经历不同冻融循环次数的试验梁进行静载实验可以得到钢纤维混凝土梁冻融后的破坏形态和裂缝拓展情况以及跨中挠度、截面应变开裂荷载和极限受弯承载力的变化。试验结果表明:随着冻融循环次数的增加,开裂荷载总体呈降低趋势,极限荷载以及跨中挠度逐渐降低,并根据已有规范结合冻融循环对混凝土强度及尺寸的影响推导出钢纤维混凝土梁开裂荷载及极限荷载的计算模型,通过模型计算得到的理论值与试验值较为符合。In order to study the degradation law of the bearing capacity of steel fiber reinforced concrete beams after freeze-thaw cycles,a concrete beam with steel fiber content of 1.5kg/m 3 was selected and its bearing capacity changes after a finite number of freeze-thaw cycles were analyzed.Two types of steel fiber concrete beams,C30(2C14)and C40(2C16),were subjected to 50,100 and 150 freeze-thaw cycles.Through the static load experiments on the experimental beams undergoing different freeze-thaw cycles,the failure forms and crack expansion of steel fiber reinforced concrete beams after freeze-thaw can be obtained,as well as the changes of mid-span deflection,section strain cracking load and ultimate flexural capacity.The results of the static load test show that with the increase of the number of freeze-thaw cycles,the cracking load tends to decrease,and the ultimate load and midspan deflection gradually decrease.According to the existing specifications and the influence of freeze-thaw cycles on the strength and size of concrete,a new calculation model is derived,and the theoretical values obtained by the model are in good agreement with the experimental values.

关 键 词：钢纤维混凝土梁 冻融循环试验 受弯承载力 开裂荷载 

分 类 号：TU528.572[建筑科学—建筑技术科学]