초장대 사장교 Prototype 설계를 위한 내풍구조 특성 연구

The structural dynamic characteristics of the present long span cable-stayed bridges under construction and in service were investigated to study the aerodynamic characteristics of a super long span cable-stayed bridge for prototype design. The wind tunnel tests were carried out to find an optimized bridge deck section on the assumption that the main span of the bridge increases as 1,500 m and estimation of the structural dynamic characteristics of it. The streamlined one-box girder section with a main span of 1,200 m was adopted as a super long span cable-stayed bridge prototype design considering structural economics. The 3-dimensional aeroelastic model tests were carried out including erection stages and the wind-induced responses were compared with those of the representative long span cable-stayed bridges of the world. It is estimated that the prototype bridge design has superior aerodynamic stability since harmful vibrations such as vortex-shedding or flutter were not observed within the design wind speed.