Abstract
In the design of tunnel linings constructed with steel fiber reinforcement concrete, the second straight-line of a two-straight-line model as a tension-softening curve is adopted in this study. The influence of tensile limit strain on the lining strength and characteristics of cracks caused by stress resultant were examined in order to obtain the lining strength and the crack width from bending test results handily and to reflect it in the lining design. As a result, the method for estimating the crack width was clarified, and the method for approximating two parameters of the tension-softening curve from a load-crack width curve obtained by a bending test was proposed.
