Bending Tests of Full-Scale Steel Fiber-Reinforced Concrete Segments of Shield Tunnel

Abstract:

To evaluate the bending performance of a steel fiber-reinforced concrete shield segment, bending testing was conducted on prism specimens and full-scale segments with 30 kg/m³ and 40 kg/m³ steel fiber. The results show that, with increasing fiber content, the ultimate and equivalent flexural strengths increase, while the flexural toughness of the prism concrete specimen increases by approximately 15%. With increasing fiber content, the flexural capacity of the shield tunnel segment increases, the peak load increases by 24%, the crack number increases, and the average crack width decreases. During bending tests, the steel fiber-reinforced concrete segment shows remarkable characteristics of strain hardening and multiple cracking. The embedded parts reduce the cross-sectional area and cause stress concentration in the mid-span; therefore, the main crack form in this region.

• Periodical: Key Engineering Materials (Volume 768)
• Pages: 326-330
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.768.326
• Online since: April 2018
• Authors: Bo Chen*, Li Ping Guo, Wei Sun, Cong Ding
• Keywords: Bending Test, Flexural Toughness, Full Scale, Segment, Steel Fiber

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