For the last several years, climatic changes have led to the increase of natural disaster attributed to climatic abnormality, for instance, sweltering heat, heavy snow, or heavy rain. Particularly, localized guerrilla heavy rain mostly occurring in summer often results in flood damage. Such damage may lead to fatal damage to the safety of underground structures having the water level as the load. Accordingly, this study is going to introduce the cases of safety analysis grounded on numerical analysis in order to understand the structural behavior of riverbed tunnels according to water level fluctuations.

In the case of a railway bridge where the ratio of live load to fixed load is relatively large, one of the main factors that dominate the bridge life is the fatigue phenomenon that occurs due to long-term accumulation by live load. Therefore, evaluating and constantly maintaining the fatigue life of cables in cable-supported bridges is an important item in ensuring the safety of bridges over their lifetime.

In the case of a railway bridge where the ratio of live load to fixed load is relatively large, one of the main factors that dominate the bridge life is the fatigue phenomenon that occurs due to long-term accumulation by live load. Therefore, evaluating and constantly maintaining the fatigue life of cables in cable-supported bridges is an important item in ensuring the safety of bridges over their lifetime.

Based on the experiment, characteristic of local stresses and deformation in the anchorhead and wedges with prestressing of PSC slab was investigated in this study. As a result, local stresses exceeded yeild stress in the contacts of anchorhead and wedges and in the lower sides of anchorhead