Design Method of Reinforced Concrete Segment of Shielded Tunnel using Steel Fiber and Hybrid Fiber

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  • 繊維補強鉄筋コンクリートを用いたシールドセグメントの設計手法
  • センイ ホキョウ テッキン コンクリート オ モチイタ シールドセグメント ノ セッケイ シュホウ

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Abstract

Recently, reinforced concrete segments (RC segments) of shielded tunnel are required to be wide and thin in terms of reducing construction cost. On the other hand, RC segments have some problems which are occurrence of cracks and dropping out of concrete chips under construction. Reinforced concrete segment with steel fiber and hybrid fiber is suitable for preventing such problems because of tension stress transfer of fibers across cracks. This bridging effect of fibers in concrete is also expected to strengthen bearing capacity for flexure and shear. Based on tension softening relation examined from notched 3-point bending tests and loading test results of full-scale segment pieces and beams, design method of fiber reinforced concrete segment is presented in this paper.

Journal

  • Concrete Journal

    Concrete Journal 48 (10), 10_18-10_26, 2010

    Japan Concrete Institute

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