Experimental and Numerical Evaluation of Reinforced Concrete Bracket Design for Supporting Middle Slab in Double-Deck Tunnel

This research was conducted to evaluate the design of reinforced concrete brackets that support middle slabs in a double-deck tunnel by performing experimental and numerical analyses. The most distinctive feature of double-deck tunnel is the existence of middle slabs. Since the brackets attached to the tunnel liner sustain all the loads applied on middle slabs, it is crucial to design brackets appropriately to ensure safety against falling of middle slab, failure of tunnel liner, and associated human and material damages. The structural design of bracket was performed based on currently available design methods. Test specimens of the bracket attached tunnel liner structure were fabricated and loading tests were conducted to verify appropriateness of the design, to evaluate safety factors to damages and failures, and to find the failure mode. The numerical analysis models of the bracket attached tunnel liner structure were also developed and analyses were performed to confirm the bracket design and to evaluate the effect of bracket shape on the structural capacity of bracket. Based on the experimental and numerical analysis results, the safety factors to damage and failure of bracket were obtained to be large enough. However, since the shape of bracket may reduce the safety factors, suggestions were finally provided to improve the design of bracket for the use in double-deck tunnels.

Language

  • English

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Filing Info

  • Accession Number: 01720022
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Jul 17 2019 3:06PM