The Effect of Earthquake Frequency Content on the Internal Forces in the Tunnels Permanent Lining

ABSTRACT

In this paper, the effect of earthquake frequency content on the tunnel permanent lining is studied. For this purpose, dynamic analysis of Gilavand tunnel was performed using 15 real accelerograms with different frequency contents by the finite difference method (FDM). Although accelerograms have the same maximum acceleration and duration, they are different in predominant frequency, peak particle velocity (PPV), peak particle displacement (PPD), and specific energy density (SED). The results showed that the closer the frequency of earthquakes to the ground natural frequency, the larger the forces and displacement in tunnel lining.

KEYWORDS:

• Frequency content
• earthquake load
• tunnel lining
• finite difference method