冻融作用下自密实混凝土梁抗弯力学性能研究  

Study on the flexural mechanical properties of self-compacting concrete beams under the action of freeze-thaw

作　　者：贺成林 韩风霞[1,2] 刘清 刘鹏举[1] 刘继颜 徐欢 HE Chenglin;HAN Fengxia;LIU Qing;LIU Pengju;LIU Jiyan;XU Huan(College of Architectural and Civil Engineering, Xinjiang University, Urumqi 830047, China;Key Lab of Building Structure and Earthquake Resistance, Urumqi 830047, China)

机构地区：[1]新疆大学建筑工程学院,乌鲁木齐830047 [2]新疆建筑结构与抗震重点实验室,乌鲁木齐830047

出　　处：《中国科技论文》2020年第10期1157-1161,1176,共6页China Sciencepaper

基　　金：国家自然科学基金资助项目(51368057)。

摘　　要：为了研究冻融循环作用下自密实混凝土简支梁的抗弯力学性能,设计并制作了4组C30简支梁,尺寸为100 mm×150 mm×950 mm,在经受不同冻融循环次数后进行抗弯试验,分析其冻融破坏形态、荷载-挠度曲线、裂缝宽度、极限承载力的变化规律。结果表明:随着冻融次数的增加,自密实混凝土梁的裂缝宽度逐渐增加,但其极限承载力呈先减小后增加的趋势;分别冻融50、100、150次,自密实混凝土梁的极限承载力相对于冻融0次的极限承载力呈先减小后增加的趋势;在相同荷载下,随着冻融次数的增加,自密实混凝土梁的挠度呈先减小后增加的趋势。In order to study the flexural mechanical properties of self-compacting concrete simply supported beams under freeze-thaw cycles,four groups of C30 simply supported beams with the size 100 mm×150 mm×950 mm were designed and fabricated in this paper.After through different freeze-thaw cycles,flexural tests were carried out.The change laws of freeze-thaw failure modes,load-deflection curves,crack width and ultimate bearing capacity were analyzed.The results show that with the increase of freeze-thaw cycles,the crack width of the self-compacting concrete beam gradually increases,but its ultimate bearing capacity decreases firstly and then increases.The ultimate bearing capacity of self-compacting concrete beams decreases firstly and then increases,compared with the ultimate bearing capacity of 0 freeze-thaw cycles for 50,100,and 150 times respectively.Under the same load,with the increase of freeze-thaw cycles,the deflection of self-compacting concrete beams decreases firstly and then increases.

关 键 词：冻融循环 自密实混凝土 简支梁 抗弯挠度 抗弯极限承载力 

分 类 号：TU528.01[建筑科学—建筑技术科学]