In this study on the seismic behavior of the bridge that does not affect the safety of the range of variation of the length of the pier was looking for.
The type of bridge is difficult to set clear standards for the geometric stiffness of the bridge, due to the diversity of soil conditions on the number of all cases. Thus, PSC girder and steel box girder bridge the representative of the highway bridge types were analyzed. Changes in the length of the pier ± 5% increments up to 20% were analyzed.

• 장동휘(도로교통연구원 박사후 연구원, 공학박사) | Jang, Dong Hui
• 박창호(도로교통연구원 수석 연구원, 공학박사) | Park, Chang Ho
• 안상섭(도로교통연구원 수석 연구원, 공학박사) | Ahn, Sang Sup