호남고속철도 PSC 교량 동특성의 계절적 변화

초록

From a long-term measurement of the 40m PSC box girder bridge of the Honam High-speed Railway, seasonal variations in structural dynamics properties of the bridge were examined. The target bridge generally showed a natural frequency of 4.5 Hz, but the natural frequency increased to at most 5.3 Hz at sub-zero temperatures in winter. The increase in natural frequency is interpreted as at most 39% increase in stiffness of the bridge in winter. It seems that the reason for the increase in stiffness of the bridge in winter is that the slab track and the bridge were fixed due to freezing and structurally integrated. When the protective concrete layer (PCL) and track slab (TCL) are integrated with the bridge structure, the flexural stiffness of the bridge increases by 30 to 40%, which is similar to the variation of stiffness according to the increase in natural frequency. However, additional experimental verification is needed in the future to determine how much the integration caused by freezing between the slab track and the bridge actually affects.

키워드