Abstract
When tunnel is deformed by earthquake ground motion, cracks appear on the reinforcsed concrete lining. Strain of tunnel lining during earthquake is depend on stiffness of cracked section. The relationship between stiffness and strain is nonlinear based on bond characteristics. An axial tension test is carried out. The stiffness of cracked section was mesured directly, and calculated from the strain distribution of reinforcement bar. The calculated stiffness well agrees with the experimental results. And earthquake resistant design of tunnel lining considering the stiffness of cracked section is applied to a test model.
