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- Title
Confinement of rectangular columns made with engineered cementitious composites (ECC).
- Authors
Wong, Wai Man; Cruz-Noguez, Carlos A.; Tolou-Kian, Mohammad J.
- Abstract
Engineered cementitious composites (ECC) is a type of high-performance fiber-reinforced cementitious composites (HPFRCC) designed to achieve high tensile strain capacity with strain hardening effect during the post-cracking response. Previous studies show that ECC has high damage-tolerance capacity in tension, increasing the durability, safety, and sustainability of structures susceptible to cracking and spalling under moderate to severe loading. Under compression, however, there is a lack of data regarding confinement effects on steel-reinforced ECC (RECC) members. Thus, designing ECC structures is usually done by assuming the ECC behaves in the same way as conventional concrete under compression. With scarce experimental data available, this assumption may be inaccurate, uneconomical, or even unsafe. An experimental test program on confined ECC columns was performed in this study. Sixteen 100 mm × 100 mm × 300 mm ECC square columns, consisting of one set of unconfined ECC and three sets of confined ECC with 1%, 1.5%, and 2% transverse steel content were fabricated and tested under monotonic compressive load until failure. The force–displacement and stress–strain relationships in the longitudinal direction were measured. The results show that confined ECC has a compressive stress–strain behavior similar to that of confined high-strength concrete, with a rapid compressive strength loss after peak strength, and a gradual loss of strength that is inversely proportional to the amount of steel reinforcement. An empirical stress–strain model for rectangularly confined high-strength ECC was developed based on an existing model for high-strength conventional concrete.
- Subjects
CEMENT composites; FIBROUS composites; COMPRESSION loads; STRAIN hardening; REINFORCING bars
- Publication
Canadian Journal of Civil Engineering, 2020, Vol 47, Issue 11, p1215
- ISSN
0315-1468
- Publication type
Article
- DOI
10.1139/cjce-2019-0313