Mockup Cat walk Test The catwalk is the aerial scaffolding to perform cable erection work and erected on the cat walk ropes. The catwalk system for the Bridge was expected to have problems during the erection of the cables because of the sag ratio and the spatial cable system. The inclined angle of the catwalk near the tower top is about 41℃. As the main cables are linked to the stiffening truss by the suspenders, the shape of the center span cables changes from straight to curve. During the transition, the catwalk needs to be bent and follow the transition of the cables. The mockup tests were conducted to deal with above mentioned problems. The tests showed that the steps were needed near the tower top. The intertwined wire mesh catwalk system were required to accommo-date the transition of the main cable. 모형시험전경 View of Mock-up Test C/W의 형상변경 Displacement of C/W 목재 및 용접 철망 계단 Timbers and Steps