Eccentric compression behavior of prefabricated ECC shell‐reinforced concrete composite column: Experimental and numerical investigation

Le résumé fourni par la source

Abstract Engineered cementitious composites (ECCs) have the potential to enhance both energy dissipation and damage tolerance of structural members. However, the challenges associated with in situ casting of large volumes of ECCs, as well as the relatively high cost, have limited their widespread application. To address these limitations, this study firstly proposed an innovative prefabricated ECC shell‐reinforced concrete composite (ECC shell‐RC) column. Four prefabricated ECC shell‐RC columns were designed and manufactured, as well as two CIP RC columns and one pure ECC column for comparison. Subsequently, a series of static eccentric compression experiments were conducted to explore the eccentric mechanical behavior of these prefabricated ECC shell‐RC columns, including the failure modes, load‐axial/lateral deformation responses, load‐strain relationships, and so forth. Finally, three‐dimensional numerical models were established and validated with experimental results. The effects of the design parameters (e.g., ECC shell thickness and stirrup ratio) on the eccentric compression behavior of the prefabricated ECC shell‐RC columns were also investigated. The experimental and numerical results demonstrated that the prefabricated ECC shell‐RC column can achieve the mechanical properties equivalent to those of the pure ECC column. With the eccentricity increasing from 50 to 125 mm, the bearing capacity P k of the specimens decreased by 7.94%–47.83% respectively; the relevant post‐peak ductility was in the range of 1.31–1.53, which was significantly larger than that of the RC columns. The incorporation of ECC shell can decrease the possibility of brittle failure characteristics of traditional RC columns under small eccentric compression. The ECC shell thickness t , compressive strength f c,ecc , rebar ratio ρ s , and ρ v have positive correlation influences on the bearing capacity of the prefabricated ECC shell‐RC columns; meanwhile, t , f c,ecc , and ρ v have significant influences on the post‐peak ductility of the prefabricated ECC shell‐RC columns, and ECC shell can play some role of stirrups.

Ce résumé expose les affirmations des auteurs. BNTIC ne l’interprète pas comme une validation indépendante des résultats.