自密实GHPFRCC梁抗弯性能研究  

Study on flexural behavior of self-compacting green high-performance fiber reinforced cementitious composite beams

作　　者：鲁西 李秀领[1,2] 郭强[3] 孙广 蔡帅 丁经伟 吕相蓉 LU Xi;LI Xiuling;GUO Qiang;SUN Guang;CAI Shuai;DING Jingwei;LV Xiangrong(School of Civil Engineering,Shandong Jianzhu University,Jinan 250101,China;Key Laboratory of Building Structural Retrofitting and Underground Space Engineering,Ministry of Education,Shandong Jianzhu University,Jinan 250101,China;The Second Construction Limited Company of China Construction Eighth Engineering Division,Jinan 250000,China;China Construction Second Engineering Bureau Ltd.,Beijing 100000,China)

机构地区：[1]山东建筑大学土木工程学院,山东济南250101 [2]山东建筑大学建筑结构加固改造与地下空间工程教育部重点实验室,山东济南250101 [3]中建八局第二建设有限公司,山东济南250000 [4]中国建筑第二工程局有限公司,北京100000

出　　处：《混凝土》2022年第10期123-127,131,共6页Concrete

基　　金：国家自然科学基金面上项目(51278290);山东省自然科学基金(ZR2020ME245);中国地震局工程力学研究所实验室开放课题(2019D10)。

摘　　要：绿色高性能纤维增强水泥基复合材料GHPFRCC(Green high-performance fiber-reinforced cementitious composites,简称GHPFRCC)是通过大掺量工业废料粉煤灰部分取代水泥,并加入聚乙烯醇纤维等材料制备而成的一种复合材料,具有绿色环保、力学性能优异的特点。为研究自密实GHPFRCC梁的抗弯性能,对1根C30梁和1根自密实GHPFRCC梁进行四点弯曲试验,同时利用有限元分析软件ABAQUS建立其有限元模型。将模拟结果与试验结果对比,验证模型的有效性,以此模型为基础对配箍率和GHPFRCC浇筑厚度两种工况进行模拟。结果表明,GHPFRCC能提高梁的抗弯刚度,改善梁的抗弯性能;自密实GHPFRCC可以部分替代箍筋,但配制一定的箍筋可以更好地提高梁的极限承载力;使用自密实GHPFRCC浇筑梁的保护层可以提高梁的抗弯性能。Green high-performance fiber-reinforced cementitious composites(GHPFRCC)is produced by adding a large amount of industrial waste fly ash to partially replace cement and polyvinyl alcohol fiber into cement based composites,which have the characteristics of environmental protection and excellent mechanical properties.In order to study the mechanical properties of self-compacting GHPFRCC beams,it conducts a series of four points bending tests on a C30 beam and a self-compacting GHPFRCC beam,then the finite element analysis software ABAQUS is used to study the performances of these beams.After compare the simulation results with the test results to verify the effectiveness of the model,two working conditions are simulated,including with hoop rate and protective layer thickness are simulated.The results show that,GHPFRCC can increase the flexural rigidity and improve the flexural performance of the beam.Self-compacting GHPFRCC can partially replace stirrups,but a certain amount of stirrups can better improve the ultimate bearing capacity of beams.And using self-compacting GHPFRCC to cast beam protective layer can improve the bending performance of the beam.

关 键 词：绿色高性能纤维增强水泥基复合材料 梁 四点弯曲试验 ABAQUS 抗弯性能 

分 类 号：TU528.01[建筑科学—建筑技术科学]