International Session (Disaster Prevention and Mitigation)

[CS2-34] SEISMIC DESIGN OF BORED TUNNEL SEGMENT ACCORDING TO EUROPEAN AND JAPANESE APPROACHES

〇Yoshinari Hidetoshi¹, Tran Viet Thanh¹ (1.Shimizu Corporation)

Keywords:Bored tunnel, Segmental lining, Seismic design, Beam-spring model, Close-form solutions, FEM

This paper studies the seismic design of the bored tunnel segment where the mixed use of international codes has been observed. Our main purpose is to compare the famous Japanese beam-spring model and the equivalent stiffness of the tunnel lining method which is commonly used in Europe. It is found that the former tends to underestimate the bending moment slightly and the axial force significantly compared to the latter. However, there is possibly not much difference between two methods in term of the rebar quantity due to the combined effect of the bending moment and axial force.