Tension Stiffening Behavior of Strain-Hardening Cement Composite (SHCC) Ties in Monotonic and Cyclic Loadings
Abstract:Strain-hardening cement composite (SHCC) is a superior class of fiber reinforced cement composites (FRCCs) which exhibit multiple cracks and strain-hardening behavior under direct tension. This study investigated the tensile behavior of reinforced SHCC ties in monotonic and cyclic tension. The effect of loading scheme, tie cover-to-bar diameter ratio (c/d b ) and cement composites’ ductility were the principal variable considered. Each specimen had a square cross-section dimension and length of 500 mm. A 16 mm diameter deformed bar was embedded centrally to give reinforcement ratio of 6.5 percent. The strain-hardening and multiple cracking characteristic of SHCC improves tension stiffening in reinforced cement composite because SHCC are able to carry tensile forces at the cracks. For tension ties Type A with smaller c/d b , pre-and post-cracking response leans towards the response of bare bar. As the c/d b decreases, reduction in tension stiffening takes place. Cyclic loading did not have a significant effect on either tension stiffening or cracking behavior for the concrete tie tested.
Document Type: Research Article
Publication date: 2012-07-01
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