Bond behavior between stainless steel rebar and fiber reinforced coral concrete under lateral constraint.

Due to the limited properties of coral aggregate concrete, it is worth exploring its expanded applications in island construction by reinforcing it with carbon fiber and stainless steel rebar. Moreover, given the complexity of stress states in frame joints, studying the bond behavior of stainless steel rebar and carbon fiber reinforced coral concrete is critical. This study used lateral constraint to simulate the stress state of the joints. The results showed that increasing fibers content could enhance bond strength by 14.5 %. Furthermore, bond strength significantly increased with the increase of lateral constraint, although the growth rate first increased and then decreased, peaking at 20.68 %. Because the lateral constraint and the bond direction were not in the same plane, a spatial theoretical bond strength model was proposed to predict the characteristic bond values in four distinct states. Finally, a damage constitutive model was established to predict the bond-slip relationship based on damage theory. The research presents valuable insights into using coral concrete in marine structure frame joints, serving as a basis for future studies. • The bond failure patterns under various lateral constraints were observed. • The bond strength was analyzed in the presence of lateral constraints and CFs. • A spatial theoretical bond strength model under lateral pressure was established. • The bond-slip trend was predicted by a modified damage constitutive model. [ABSTRACT FROM AUTHOR]