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Load-Bearing Behavior of Steel Fiber-Reinforced Concrete for Precast Tunnel Lining Segments under Partial-Area Loading
During the assembly stage of precast segmental tunnel linings, the segments are often subjected to impact and concentrated loads. Since plain concrete is a quasi-brittle material exhibiting low tensile strength and fracture toughness, concrete damages - in the form of cracking and spalling - are very likely to occur on the periphery of the segments. By the addition of steel fibers into the concrete matrix, the robustness and ductility of this quasi-brittle material can be significantly enhanced due to the crack-bridging effect of fibers. To simulate the segments subjected to concentrated loads in small-scale, partial-area loading tests were carried out on plain and fiber concrete prisms under laboratory conditions. The principal variables investigated in this paper were fiber reinforcement, area ratio and loading eccentricity. The effects of those variables on the load-bearing capacity, failure mode and crack pattern were analyzed and discussed. From the experimental results, it was found that the presence of steel fibers led to a remarkable increase of the load-bearing capacity of concrete and changed its failure mode from a brittle to a ductile one. Increasing the area ratio or loading eccentricity also had significant influence on the bearing strength and failure pattern.
Load-Bearing Behavior of Steel Fiber-Reinforced Concrete for Precast Tunnel Lining Segments under Partial-Area Loading
During the assembly stage of precast segmental tunnel linings, the segments are often subjected to impact and concentrated loads. Since plain concrete is a quasi-brittle material exhibiting low tensile strength and fracture toughness, concrete damages - in the form of cracking and spalling - are very likely to occur on the periphery of the segments. By the addition of steel fibers into the concrete matrix, the robustness and ductility of this quasi-brittle material can be significantly enhanced due to the crack-bridging effect of fibers. To simulate the segments subjected to concentrated loads in small-scale, partial-area loading tests were carried out on plain and fiber concrete prisms under laboratory conditions. The principal variables investigated in this paper were fiber reinforcement, area ratio and loading eccentricity. The effects of those variables on the load-bearing capacity, failure mode and crack pattern were analyzed and discussed. From the experimental results, it was found that the presence of steel fibers led to a remarkable increase of the load-bearing capacity of concrete and changed its failure mode from a brittle to a ductile one. Increasing the area ratio or loading eccentricity also had significant influence on the bearing strength and failure pattern.
Load-Bearing Behavior of Steel Fiber-Reinforced Concrete for Precast Tunnel Lining Segments under Partial-Area Loading
Song, Fanbing (author) / Breitenbücher, Rolf (author)
Geo-Shanghai 2014 ; 2014 ; Shanghai, China
Tunneling and Underground Construction ; 266-274
2014-05-05
Conference paper
Electronic Resource
English
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