Blast response of beams built with high-strength concrete and high-strength ASTM A1035 bars. (August 2019)

• Record Type: Journal Article
• Authors: Li, Yang; Aoude, Hassan
• Is Part Of: International journal of impact engineering. Volume 130(2019)
• Page Start: 41
• Page End: 67
• Publication Date: 2019-08
• Subjects: Blast -- High-strength reinforcement -- HSC -- Shock-tube -- Beams; Impact -- Periodicals; Shock (Mechanics) -- Periodicals; Impact -- Périodiques; Choc (Mécanique) -- Périodiques; Impact; Shock (Mechanics); Periodicals; 620.1125
• DOI: 10.1016/j.ijimpeng.2019.02.007
• Languages: English
• ISSNs: 0734-743X

Abstract

Highlights: A series of HSC beams with 690 MPa bars are tested under blasts and influence of steel/concrete grade is investigated. Use of high-strength bars increases blast resistance and improves control of displacements. Results show importance of not exceeding the balanced steel ratio and show HSC is better adapted for beams with HSR bars. Dynamic inelastic SDOF analysis is used to predict the blast response of the HSC beams with HSR bars. Abstract: The work reported in this paper is aimed towards better understanding the behavior of reinforced concrete flexural members built with high-strength reinforcement (HSR) under blast loading. As part of the study, a series of high-strength concrete (HSC) beams built with ASTM A1035 Grade 690 MPa bars are tested under simulated blast loads using a shock-tube. Parameters investigated include the effect of steel type (Grade 690 MPa vs. 400 MPa), concrete strength (100 MPa vs. 50 MPa) and reinforcement ratio ( ρ = 1%–2.2%). The effect of loading rate is investigated by testing a companion set of beams under slowly applied (quasi-static) loading. The results show that use of high-strength steel in HSC beams results in increased blast capacity and improved control of displacements at equivalent blasts. The use of high-strength concrete is also found to be better suited for beams reinforced with high-strength bars. The results further demonstrate the importance of ensuring beams designed with high-strength bars are under-reinforced and provided with sufficient shear reinforcement. The blast response of the beams is predicted analytically using dynamic analysis.