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RETRACTED: Rebar/Corrosion-Free HS-ECC Beam for coastal structures: Optimization for Exceptional Strength-to-Mass Ratios

Kequan YuCollege of Civil Engineering, Tongji University, Shanghai, ChinaYunqi JiangCollege of Civil Engineering, Tongji University, Shanghai, ChinaYao DingCollege of Civil Engineering, Chongqing University, ChongqingNeven UkrainczykTechnical University of Darmstadt, Franziska-Braun-Str. 3, Darmstadt, GermanyLingzhi LiCollege of Civil Engineering, Tongji University, Shanghai, ChinaIftikhor KalandarbekovTajik technical University named after academician M.S.Osimi, Academics Rajabovs, TajikistaOybek VokhidovTashkent Institute of irrigation and agricultural mechanization engineers, Tashkent, UzbekistanPetr KabeleFaculty of Civil Engineering, Czech Technical University, Prague, Czech RepublicZhi ZhangCollege of Civil Engineering, Tongji University, Shanghai, China

2025en

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Litsenziya: cc-by-nc-nd

ABI

Annotatsiya

High-strength engineered cementitious composites (HS-ECC) with both high tensile strength and ductility possesses the potential for use in rebar/corrosion-free coastal structures. Referring to I-shaped steel beams, the cross-sections of rebar-free HS-ECC beams can be optimized to significantly improve strength-to-mass ratio and material utilization. Six rebar-free I-shaped HS-ECC beams with various web thickness ratios (web thickness/section width, 0.2, 0.3 and 0.7), flange height ratios (bottom flange height/top flange height, 5, 2 and 1) and fiber volume fractions (1.8% and 1.0%) were conducted, alongside one rebar-free rectangular beam as reference. The results showed that multiple micro-cracks occurred in the tensile zone and propagated to the compressive zone, indicating the full utilization of cross-sections in I-shaped HS-ECC specimens. As the flange height ratio increased to 5, the strength-to-mass ratio was 50.0% higher than rectangular beam. A theoretical model was developed to predict the flexural behaviors of rebar-free HS-ECC beams. The predicted load-deflection curves agreed well with the experimental results, with average ratios of experimental to predicted values for load and deflection at the ultimate point being 0.96 and 0.79, respectively. Parametric analyses were further conducted to investigate the effects of web thickness ratio, web height ratio (web height/section height) and HS-ECC ultimate tensile stress on curvature, neutral axis depth, ultimate load, and strength-to-mass ratio. As anticipated, the strength-to-mass ratios of most I-shaped specimens were higher than those of rectangular specimens. Ultimately, a design method was proposed to determine the cross-section with the maximum strength-to-mass ratio, providing a foundation for efficient and rational structural design.

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Identifikatorlar

DOI: 10.1016/j.cscm.2025.e04812

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