Efficiency index for fiber-reinforced concrete lining at ultimate limit state. Issue 1 (10th June 2016)

• Record Type: Journal Article
• Authors: Fantilli, Alessandro P.; Nemati, Kamran M.; Chiaia, Bernardino
• Is Part Of: Sustainable and resilient infrastructure. Volume 1:Issue 1/2(2016)
• Page Start: 84
• Page End: 91
• Publication Date: 2016-06-10
• Subjects: Fiber-reinforced concrete -- efficiency index -- ultimate limit state -- cast-in situ concrete lining -- precast tunnel segments; Sustainable development -- Periodicals; Infrastructure (Economics) -- Periodicals; Hazard mitigation -- Periodicals; Structural analysis (Engineering) -- Periodicals; 624.17
• DOI: 10.1080/23789689.2016.1178558
• Languages: English
• ISSNs: 2378-9689

Abstract

Abstract: The fiber contribution to the ultimate limit state capacity of precast and cast- in situ tunnel linings is analytically investigated. By means of a numerical model, capable of computing the interaction curves of reinforced concrete cross sections subjected to combined compressive and bending actions, the mechanical performances of plain and fiber-reinforced concrete are compared. As a result, a new index is introduced to quantify the effectiveness of fiber addition. The higher the efficiency index, the higher the amount of steel reinforcing bar that can be removed from a plain concrete cross section. The application to real concrete linings, where shear resistance is ensured without shear reinforcement, shows that a large volume of rebar can be saved by the presence of steel fibers. This gives significant advantages in terms of durability and rapidity of tunnel construction.