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Abstract: This paper presents an experimental investigation into the shear behavior of reinforced ultra-high toughness cementitious composite (UHTCC) beams through flexural tests under a point loading, where UHTCC shows tension strain-hardening and multiple cracking characteristics. The varied parameters include shear-span ratios of about 2.06, 3.08, and 4.11, and web reinforcement ratios of 0%, 0.25%, 0.37%, and 0.55%. The experimental results reveal that reinforced UHTCC (RUHTCC) beams have superior shear resistance compared with reinforced concrete (RC) beams and show stable crack propagation and multiple cracking behaviors in shear. The use of UHTCC as the matrix of beams can serve as a replacement for minimum web reinforcement. A small amount of stirrups used in RUHTCC slender beams results in a more ductile flexure-shear or even flexural failure. However, the use of stirrups in both short beams and RUHTCC slender beams brings little improvement in ultimate shear strength, and thus no shear synergy between UHTCC and stirrups is obtained. A tied-arch model and a truss model can be used to represent the shear mechanism of RUHTCC short and slender beams, respectively. UHTCC web subjected to tension can be considered as inclined tension web members in a truss model for RUHTCC slender beams.

The paper presents results of an experimental series on ultra-high toughness cementitious composites (UHTCC), which the authors explain to be what has elsewhere been defined as SHCC, or strain-hardening cement-based composites. Shear-dominant beams were designed and built, considering parameters of shear span to depth, level of shear reinforcing steel or stirrups, and reference reinforced concrete elements of similar concrete compressive strength class. Distinct differences in behaviour of R/UHTCC and R/C beams are reported, including significantly reduced shear crack widths in R/UHTCC, and no splitting cracking and debonding along flexural steel in R/UHTCC beams. Minimum stirrups are argued to be replaceable by the fibre reinforcement, based on the results indicating that no synergy in fact exists in combining fibre and stirrup reinforcement, and in the shear enhancement that the fibres add already. The tied-arch and truss analogies are proposed for modelling short and slender R/UHTCC beams respectively. I believe that these results are of interest to the readers of this journal .

钢筋增强超高韧性水泥基复合材料梁的剪切性能试验研究

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