Influence of steel fibers on the static and blast response of beams built with high-strength concrete and high-strength reinforcement. (15th October 2020)

• Record Type: Journal Article
• Authors: Li, Yang; Aoude, Hassan
• Is Part Of: Engineering structures. Volume 221(2020)
• Publication Date: 2020-10-15
• Subjects: Fibers -- High-strength concrete -- HSFRC -- High-strength reinforcement -- Shock tube -- Blast loads -- Reinforced concrete beams; Structural engineering -- Periodicals; Structural analysis (Engineering) -- Periodicals; Construction, Technique de la -- Périodiques; Génie parasismique -- Périodiques; Pression du vent -- Périodiques; Earthquake engineering; Structural engineering; Wind-pressure; Periodicals; 624.105
• DOI: 10.1016/j.engstruct.2020.111031
• Languages: English
• ISSNs: 0141-0296

Abstract

Highlights: Six HSS-RC beams built with fibers and Grade 690 bars are tested under static and simulated blast loads. Fibers improve ductility of HSS-RC beams under static loads allowing for full utilization of HSS bars. Fibers also reduce rotations, increase capacity and reduce damage of HSS-RC beams under blast loads. The response of the fibers reinforced HSS-RC beams was reliably predicted using 2D nonlinear FEM. Abstract: This paper presents the results of a study examining the influence of steel fibers on the static and blast performance of beams built with high-strength concrete (HSC) and high-strength steel reinforcement. As part of the study, a series of fiber-reinforced HSC beams designed with Grade 690 MPa ASTM A1035 reinforcement are tested under static and blast load conditions using a shock-tube. The performance of the beams is compared to that of a control set of specimens built with plain HSC and high-strength bars. In addition to the effects of the steel fibers, the effects of reinforcement type (Grade 690 MPa vs. 400 MPa) and high-strength steel ratio (ρ = 1–2.2%) are also investigated. Under static loads the provision of fibers is found to significantly enhance the ductility of the high-strength reinforced concrete beams. Under dynamic conditions, the use of fiber-reinforced HSC leads to important enhancements in blast behavior, including better control of displacements, increased blast capacity and improved damage resistance. As part of the numerical study the blast response of the beams is predicted using 2D finite element (FE) modelling.