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(北京建筑大學(xué)土木與交通學(xué)院， 北京 100044)

摘要: 工程水泥基復(fù)合材料(ECC) 是具有應(yīng)變硬化性能和優(yōu)異的裂縫控制能力的高性能水泥基復(fù)合材料，用ECC 代替混凝土可以避免混凝土脆性引起的開裂和耐久性問題。 通過不同厚度 ECC 分別替換 RC 梁的受拉區(qū)、受壓區(qū)，與 RC 梁進(jìn)行對(duì)比，分析受彎性能及延性的變化。 結(jié)果表明，實(shí)測(cè)跨中混凝土/ ECC 截面平均應(yīng)變基本符合平截面假定，混凝土與 ECC 的粘結(jié)作用良好；ECC 位于受拉區(qū)的疊合梁最大裂縫寬度小于 RC 梁，可見 ECC 能有效控制裂縫的開展；ECC 位于受壓區(qū)疊合梁的極限變形能力高于 RC 梁，且疊合梁的延性較 RC 梁得到大幅度提高。

關(guān)鍵詞: 工程水泥基復(fù)合材料； 疊合梁； 抗彎性能； 延性； 撓度

中圖分類號(hào):TU375 文獻(xiàn)標(biāo)志碼:A 文章編號(hào):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，碩士，主要從事混凝土結(jié)構(gòu)方向研究，Email:lctwh@ 163.com。

[引用本文] 唐文涵，何淅淅. 工程水泥基復(fù)合材料疊合層對(duì)梁受彎性能的影響[J]. 建筑結(jié)構(gòu)，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.