Steel Fibre Reinforced Concrete Tunnel Lining Segments: Design, Construction and Sustainability Aspects
DOI:
https://doi.org/10.21467/proceedings.7.7.23Abstract
In contrast to conventional reinforcing bars that form directional reinforcement in concrete elements, steel fibres form distributed reinforcement to effectively bridge across cracks at all locations and orientations. This improves the resistance to crack proliferation and propagation, ductility, energy absorption capability, and durability performance. Steel fibre reinforced concrete (SFRC) are particularly advantageous for the crack control of concrete elements under complex stress conditions, such as tunnel lining segments. In this paper, an account of the structural design, materials design, construction and sustainability aspects of precast SFRC tunnel lining segments is presented. It is remarked that regarding the fire resistance, polypropylene fibres can be incorporated in conjunction with steel fibres to form a hybrid fibre system for mitigating the risk of concrete spalling under elevated temperature.
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