Flexural behaviour of high strength engineered cementitious composites (ECC)-reinforced concrete composite beams

被引：24

作者：

Qin, Fengjiang ^{[1
]}

Wei, Xinyan ^{[1
]}

Lu, Youfu ^{[2
]}

Zhang, Zhigang ^{[1
]}

Di, Jin ^{[1
,3
]}

Yin, Zhiwei ^{[1
]}

机构：

[1] Chongqing Univ, Sch Civil Engn, Key Lab New Technol Construct Cities Mt Area, Chongqing 400030, Peoples R China

[2] Shandong Hispeed Grp Co Ltd, 9999 Jingshi Rd, Jinan 250000, Shandong, Peoples R China

[3] Zhejiang Univ, Coll Civil Engn & Architecture, Hangzhou 310058, Peoples R China

来源：

CASE STUDIES IN CONSTRUCTION MATERIALS | 2023年 / 18卷

基金：

中国国家自然科学基金;

关键词：

ECC; Composite beam; Flexural behaviour; Moment capacity estimation; STRUCTURAL PERFORMANCE; ECC; TOUGHNESS; DESIGN;

D O I：

10.1016/j.cscm.2023.e02002

中图分类号：

TU [建筑科学];

学科分类号：

0813 ;

摘要：

The flexural behaviour is investigated in this paper for engineered cementitious composite (ECC)-reinforced concrete (RC) composite beams. The thickness and shape of the ECC layer are the variables studied. ECC has proved to be one of the ideal construction materials for improving the flexural capacity of reinforced conventional concrete beams. When the composite beam speci-mens reached the load-bearing limit state, only dense micro-cracks appeared in the ECC layer in the tensile zone, and no local fracture was observed in the test, reflecting the high ductility of ECC. The load values for all phases of the ECC-RC composite beams are higher than those of the RC beams, suggesting that the composite beams have better ductility and energy absorption ca-pacity. In addition, the ability of the U-shaped ECC layer composite beam to limit crack devel-opment and the synergistic effect with the reinforcement is superior compared to the other tested beams. Finally, considering the strain-hardening characteristics of ECC, based on the force equilibrium conditions, the formulae are derived for the flexural capacity of ECC-RC composite beams.

引用

页数：17

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