Abstract
During Hyogoken Nanbu Earthquake, significant damages were observed in the underground structures which were constructed mainly by cut and cover method. After the earthquake, seismic design of underground structures was reviewed and revised, and limit state design method was introduced instead of allowable stress design method.
The authors intend to utilize precast segment method for construction of cut and cover tunnels for purpose of labor-saving and quality enhancement. However, fundamental data on the relationship between deformation characteristics of post-tensioning joint and damage of the structures, which are essential for the verification of various limit states, are quite limited.
In this study, effects of the distribution and bond characteristics of prestressing steels as well as the existence of joint mortar on the load-deformation relationship of model specimens with post-tensioning joint were investigated.
