(北京建筑大学土木与交通学院， 北京 100044)

摘要: 工程水泥基复合材料(ECC) 是具有应变硬化性能和优异的裂缝控制能力的高性能水泥基复合材料，用ECC 代替混凝土可以避免混凝土脆性引起的开裂和耐久性问题。 通过不同厚度 ECC 分别替换 RC 梁的受拉区、受压区，与 RC 梁进行对比，分析受弯性能及延性的变化。 结果表明，实测跨中混凝土/ ECC 截面平均应变基本符合平截面假定，混凝土与 ECC 的粘结作用良好；ECC 位于受拉区的叠合梁最大裂缝宽度小于 RC 梁，可见 ECC 能有效控制裂缝的开展；ECC 位于受压区叠合梁的极限变形能力高于 RC 梁，且叠合梁的延性较 RC 梁得到大幅度提高。

关键词: 工程水泥基复合材料； 叠合梁； 抗弯性能； 延性； 挠度

中图分类号:TU375 文献标志码:A 文章编号:1002￣848X(2022)06￣0076￣05

DOI:10. 19701 / j.jzjg.20200655

Effect of engineered cementitious composite superimposed layer on flexural behavior of beams

TANG Wenhan， HE Xixi

(School of Civil and Transportation Engineering， Beijing University of Civil Engineering and Architecture， Beijing 100044， China)

Abstract: Engineered cementitious composite( ECC) is a high performance cement￣based composite material with strainhardening property and excellent crack control ability. Using ECC instead of concrete can avoid the cracking and durabilityproblems caused by concrete brittleness. The tension zone and compression zone of RC beams were replaced by ECC withdifferent heights， and compared with RC beams， the changes of flexural behavior and ductility were analyzed. The resultsshow that the average strain of concrete / ECC section in mid￣span basically accords with the plane section assumption， andthe bond between concrete and ECC is good； the maximum crack width of ECC composite beam in tension zone is smallerthan that of RC beam， which can effectively control the crack development； the ultimate deformation capacity of ECCcomposite beam in compression zone is higher than that of RC beam， and the ductility is much higher than that of RC beam.

Keywords:Engineered cementitious composite； superimposed beam； flexural behavior； ductility； deflection

第一作者:唐文涵，硕士，主要从事混凝土结构方向研究，Email:lctwh@ 163.com。

[引用本文] 唐文涵，何淅淅. 工程水泥基复合材料叠合层对梁受弯性能的影响[J]. 建筑结构，2022，52(6):76￣80，43.TANG Wenhan，HE Xixi. Effect of engineered cementitious composite superimposed layer on flexural behavior of beams[J].Building Structure，2022，52(6):76￣80，43.