기존지하철 구조물 내진성능 예비평가의 고찰

Recently, several metropolitan city have performed the preliminary seismic performance estimation by using `Guideline for Seismic Performance Estimation for Established Tunnel`. However, most of the established buried structures are classified as very urgent or urgent seismic reinforcement structures if we use that guideline. In practice, the response displacement method is the most frequently used method for seismic design of underground structures and response displacement of surrounding soil is the most important step for seismic design. Considering the response displacement method, we don't have to performed the detail estimation for all the buried structures. If the representative buried structure which has the worst ground condition is all right for earthquake load, the other structures are also all right for seismic load. This article can be useful for evaluation of displacement and earth pressure of surrounding soil during the detail estimation of seismic performance which is conducting recently for existing underground structures.