Study of Aerodynamic Performance on Concrete Deck Section in Stayed Cable Bridge

In this study, concrete deck section design is required for a harped shape type stayed cable bridge with total span of 800m with span configuration 200m-400m-200m located at open terrain crossing Sarawak River, East Malaysia. Desktop study are performed on two different type of concrete deck section i.e. monobox section and ladder deck section on their dynamic stability with respect to two mechanisms of divergent amplitude response, galloping and flutter in a stayed cable bridge. From wind climate study of site, the design wind speed for 120 years return period is 40m/s and the aerodynamic stability wind speed at deck level is 52.5m/s. The results show that monobox section is more stable with respect to aerodynamic torsional responses and is selected for deck section for the stayed cable bridge. Section model wind tunnel test was carried out on the selected monobox section, the results show that the section has good flutter and galloping stabilities up to the design wind speed.