Tension stiffening of reinforced concrete affected by radiation-induced volume expansion of aggregate

Daisuke Kambayashi; Maruyama, Ippei; Osamu Kontani; Shohei Sawada; Takahiro Ohkubo; Kenta Murakami; Kiyoteru Suzuki

doi:10.51094/jxiv.178

##article.authors##

Daisuke Kambayashi Nuclear Power Department, Kajima corporation
Maruyama, Ippei Graduate School of Engineering, The University of Tokyo
Osamu Kontani Nuclear Power Department, Kajima corporation
Shohei Sawada Nuclear Power Department, Kajima corporation
Takahiro Ohkubo Graduate School of Engineering, Chiba University
Kenta Murakami Graduate School of Engineering, The University of Tokyo
Kiyoteru Suzuki Societal Safety and Industrial Innovation Division, Mitsubishi Research Institute, Inc.

DOI:

https://doi.org/10.51094/jxiv.178

キーワード:

Tension stiffening、 Radiation-induced volume expansion、 Aggregate、 Bond

抄録

The tension stiffening behaviors of reinforced concrete (RC) prisms affected by aggregate volume expansion induced by neutron irradiation were numerically investigated using a rigid body spring network model. First, the model was validated by comparison with the uniaxial tension test results of wet- and dry-cured (with volume contraction of concrete) RC prisms. Then, different degrees of expansion strain were applied to the aggregate elements in the RC prism model and uniaxial tension loading was again simulated. Tension stiffening decreased under larger radiation-induced volume expansion of the aggregate owing to the corresponding decrease in the concrete tensile strength with increasing damage, this behavior changed dramatically according to restraint condition. Indeed, the Young’s modulus of restrained concrete after aggregate expansion was larger than that of unrestrained concrete after aggregate expansion. However, the compressive stress in the concrete after aggregate expansion was effectively transmitted to the rebar during uniaxial tension loading; this behavior indicated even after 0.5% aggregate expansion, RC can maintain its integrity under uniaxial tension.

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