石墨尾矿砂混凝土梁抗弯性能试验研究  

Experimental study on flexural performance of concrete beams with graphite tailings

作　　者：冯博雅 夏洪春[1,2] 朱训国[1,2] 刘晓洲 FENG Boya;XIA Hongchun;ZHU Xunguo;LIU Xiaozhou(College of Architectural Engineering,Dalian University,Dalian 116622,China;Key Laboratory of Disaster Prediction and Control of Complex Structure System,Dalian University,Dalian 116622,China;College of Architectural Engineering,Quzhou University,Quzhou 324000,China)

机构地区：[1]大连大学建筑工程学院,辽宁大连116622 [2]大连大学复杂结构系统灾害预测与防治重点实验室,辽宁大连116622 [3]衢州学院建筑工程学院,浙江衢州324000

出　　处：《西安理工大学学报》2022年第2期279-286,共8页Journal of Xi'an University of Technology

基　　金：辽宁省自然科学基金指导计划项目(2019-ZD-0571);辽宁省兴辽英才计划项目(XLYC 1807219);大连大学科研创新创业团队(XQN202002);大连大学科研平台重点项目(202101ZD02)。

摘　　要：通过对5根不同石墨尾矿砂取代率的钢筋混凝土梁进行抗弯试验,探究了不同石墨尾矿砂取代率对钢筋混凝土梁正截面抗弯性能的影响,分析了石墨尾矿砂钢筋混凝土梁的开裂荷载、裂缝发展、抗弯承载力及跨中挠度的变化规律。结果表明:石墨尾矿砂混凝土梁与普通混凝土梁的受弯破坏过程基本一致,仍具有弹性、开裂、屈服和极限四个阶段,裂缝发展过程基本一致;试验梁正截面应变服从平截面假定;石墨尾矿砂混凝土梁和普通混凝土梁的荷载挠度曲线变化趋势相似,随着石墨尾矿砂取代率的增加,试验梁的极限承载力先增大后降低,其中,石墨尾矿砂取代率为10%、20%、30%时,试验梁的极限承载力均比普通混凝土梁高,取代率为10%~20%的试验梁抗弯性能最优。现行规范中梁的正截面极限承载力和挠度计算公式不适用于石墨尾矿砂混凝土梁。Five reinforced concrete beams with different replacement rates of graphite tailings sand are subjected to bending tests.In order to explore the influence of different graphite tailings replacement rates on the bending performance of reinforced concrete beams,the cracking load,crack development,flexural capacity and mid-span deflection of graphite tailings reinforced concrete beams are analyzed.The results showed that the bending failure process of graphite tailing sand concrete beam and ordinary concrete beam are basically the same;it still has four stages of elasticity,cracking,yielding and limit.The crack development process is basically the same.The strain of the normal section of test beam obeys the assumption of the plane section.The load-deflection curves of graphite tailings concrete beams and ordinary concrete beams are similar.As the replacement rate of graphite tailings increases,the ultimate bearing capacity of the test beam increases first and then decreases.Among them,when the replacement rate of graphite tailings sand is 10%,20%,or 30%,the ultimate bearing capacity of this test beam is higher than that of ordinary concrete beams.The bending performance of the test beam with the substitution rate of 10%~20%is the best.The formula for calculating the ultimate bearing capacity and deflection of the beam’s normal section in the current code is not applicable to the graphite tailings concrete beam.

关 键 词：石墨尾矿砂混凝土 抗弯性能 极限承载力 跨中挠度 

分 类 号：TU375[建筑科学—结构工程]