Design Method of Reinforced Concrete Segment of Shielded Tunnel using Steel Fiber and Hybrid Fiber
By T. Mioke, K. Horiguchi, N. Fukuura, T. Maruya and Y. Hattori
Concrete Journal, Vol.48, No.10, Oct. 2010
- Synopsis
- 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.
- Keywords:
- shielded tunnel segment, fiber reinforced concrete, steel fiber, hybrid fiber, tension softening relation
