剑麻纤维自密实轻骨料混凝土梁抗弯性能与抗弯承载力分析  

Analysis of flexural performance and flexural capacity of sisal fiber self-compacting lightweight aggregate concrete beam

作　　者：董健苗[1] 李洋洋 殷玲 马发林 周悦志 DONG Jianmiao;LI Yangyang;YIN Ling;MAFalin;ZHOU Yuezhi(School of Civil Engineering and Architecture,Guangxi University of Science Technology,Liuzhou 545006,China;GuangxiWater Conservancy and Electric Power Vocational and Technical College,Nanning 530000,China;Dongguan Memory Storage Technology Co.,Ltd.,Dongguan 523000,China)

机构地区：[1]广西科技大学土木建筑工程学院,广西柳州545006 [2]广西水利电力职业技术学院,广西南宁530000 [3]东莞记忆存储科技有限公司,广东东莞523000

出　　处：《广西科技大学学报》2019年第1期4-11,共8页Journal of Guangxi University of Science and Technology

基　　金：广西教育厅科学基金项目(YB2014199)资助

摘　　要：通过对剑麻纤维自密实轻骨料混凝土梁进行抗弯性能的试验研究,验证其平截面假定,得到试验梁的荷载-跨中挠度曲线、钢筋荷载-应变曲线和破坏形态,并对试验梁的开裂荷载和抗弯承载力进行理论分析.试验结果表明:剑麻纤维自密实轻骨料混凝土梁和自密实轻骨料混凝土梁均满足平截面假定;掺加剑麻纤维或增加配筋率,能有效改善试验梁的裂缝形态并提高抗弯刚度,当剑麻纤维掺量为2 kg/m3时裂缝条数最多,但间距和宽度最小,韧性最好;剑麻纤维对自密实轻骨料混凝土梁的开裂荷载有一定影响,当剑麻纤维掺量为3 kg/m3时,开裂荷载提高最大为40%;开裂荷载和极限荷载建议采用本文修正后的推导公式计算,可与试验值吻合较好.In this paper,the experimental study on the flexural performance of sisal fiber self-compacting lightweight aggregate concrete beams was carried out to verify the plane section assumption.And the load-mid span deflection curves of the test beam,the load-strain curve and damage mode of the steel bar were obtained.The test beam's cracking load and flexural bearing capacity were theoretically analyzed.The results show that sisal fiber self-compacting lightweight aggregate concrete beams and self-compacting lightweight aggregate concrete beams all meet the plane section assumption.The results also show that adding sisal fiber or increasing the ratio of ratio of net reinforcement can effectively improve the crack form of the test beam and increase the bending stiffness.When the sisal fiber mixing content was 2 kg/m3,the number of cracks was the largest,the pitch and width were the minimum,and the toughness was the best.And sisal fiber had a certain influence on the cracking load of self-compacting lightweight aggregate concrete beams.The maximum increase of the cracking load was 40%when the sisal fiber mixing content was 3 kg/m^3.The calculations of the cracking load and the ultimate load were recommended to be in good agreement with the experimental values using the revised formula derived in this paper.

关 键 词：自密实轻骨料混凝土梁 剑麻纤维 抗弯性能 承载力 

分 类 号：TU528.572[建筑科学—建筑技术科学]