工程水泥基复合材料叠合层对梁受弯性能的影响  

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

作　　者：唐文涵 何淅淅[1] TANG Wenhan;HE Xixi(School of Civil and Transportation Engineering,Beijing University of Civil Engineering and Architecture,Beijing 100044,China)

机构地区：[1]北京建筑大学土木与交通学院,北京100044

出　　处：《建筑结构》2022年第6期76-80,43,共6页Building Structure

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

关 键 词：工程水泥基复合材料 叠合梁 抗弯性能 延性 挠度 

分 类 号：TU375[建筑科学—结构工程]