A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Tunnel lining segments with enhanced bearing capacity using hybrid concrete concepts
https://orcid.org/0000-0002-2790-9615
Highlights New lining designs: efficient in full-scale testing and on-site conditions. The designs convince through homogeneous material utilization. Up to 97% more bearing capacity with respect to conventional designs. Locally joints are reinforced with high performance steel fiber concrete. Recesses in the segmental body yield significant material savings.
Abstract In general, the design of tunnel lining segments used in mechanized tunneling is dominated by the joints. In fact, the effects of partial area loading dominate segmental failure and, consequently, the concrete bearing capacity of the central region remains underutilized. This paper presents two types of new hybrid segments with enhanced utilization ratios throughout their bodies. The first type comes with strengthened longitudinal joints using high performance steel fiber reinforced concrete, in addition to conventional reinforcement. The second incorporates one-sided barrel-shaped recesses in the central region, which yield volume savings of up to 23.8%. The performance of the new designs is experimentally evaluated on a full-size testing rig made from two steel frames with a capacity of 5MN each. It captures the on-site conditions in tunnels during service (final state). The first type of segments shows a 74.3% higher loading capacity than a conventional specimen for reference. The second performs even better and possesses 97% higher capacity. In both cases, the failure occurs in the central region. This increases structural safety and simplifies the design. Especially the design of the central region subjected to bending and axial forces gains more relevance against the controversially discussed design of the longitudinal joints.
Tunnel lining segments with enhanced bearing capacity using hybrid concrete concepts
https://orcid.org/0000-0002-2790-9615
Highlights New lining designs: efficient in full-scale testing and on-site conditions. The designs convince through homogeneous material utilization. Up to 97% more bearing capacity with respect to conventional designs. Locally joints are reinforced with high performance steel fiber concrete. Recesses in the segmental body yield significant material savings.
Abstract In general, the design of tunnel lining segments used in mechanized tunneling is dominated by the joints. In fact, the effects of partial area loading dominate segmental failure and, consequently, the concrete bearing capacity of the central region remains underutilized. This paper presents two types of new hybrid segments with enhanced utilization ratios throughout their bodies. The first type comes with strengthened longitudinal joints using high performance steel fiber reinforced concrete, in addition to conventional reinforcement. The second incorporates one-sided barrel-shaped recesses in the central region, which yield volume savings of up to 23.8%. The performance of the new designs is experimentally evaluated on a full-size testing rig made from two steel frames with a capacity of 5MN each. It captures the on-site conditions in tunnels during service (final state). The first type of segments shows a 74.3% higher loading capacity than a conventional specimen for reference. The second performs even better and possesses 97% higher capacity. In both cases, the failure occurs in the central region. This increases structural safety and simplifies the design. Especially the design of the central region subjected to bending and axial forces gains more relevance against the controversially discussed design of the longitudinal joints.
Tunnel lining segments with enhanced bearing capacity using hybrid concrete concepts
https://orcid.org/0000-0002-2790-9615
Highlights New lining designs: efficient in full-scale testing and on-site conditions. The designs convince through homogeneous material utilization. Up to 97% more bearing capacity with respect to conventional designs. Locally joints are reinforced with high performance steel fiber concrete. Recesses in the segmental body yield significant material savings.
Abstract In general, the design of tunnel lining segments used in mechanized tunneling is dominated by the joints. In fact, the effects of partial area loading dominate segmental failure and, consequently, the concrete bearing capacity of the central region remains underutilized. This paper presents two types of new hybrid segments with enhanced utilization ratios throughout their bodies. The first type comes with strengthened longitudinal joints using high performance steel fiber reinforced concrete, in addition to conventional reinforcement. The second incorporates one-sided barrel-shaped recesses in the central region, which yield volume savings of up to 23.8%. The performance of the new designs is experimentally evaluated on a full-size testing rig made from two steel frames with a capacity of 5MN each. It captures the on-site conditions in tunnels during service (final state). The first type of segments shows a 74.3% higher loading capacity than a conventional specimen for reference. The second performs even better and possesses 97% higher capacity. In both cases, the failure occurs in the central region. This increases structural safety and simplifies the design. Especially the design of the central region subjected to bending and axial forces gains more relevance against the controversially discussed design of the longitudinal joints.
Tunnel lining segments with enhanced bearing capacity using hybrid concrete concepts
Petraroia, Diego N. (author) / Plückelmann, Sven (author) / Mark, Peter (author) / Breitenbücher, Rolf (author)
2023-10-23
Article (Journal)
Electronic Resource
English
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