Shaping effects on aerodynamics of long-span cable-supported bridge deck by Unsteady RANS

Cable-supported bridge is one of the most popular structural forms adopted for long-span bridges. The applications of cable-supported bridge are increasing with the growing number of long-span bridges due to their aesthetic view and wide navigation facility. The decks of the cable-supported bridges are hanged only by the cables to span over long distance without any intermediate support. As a result, flexibility becomes an inherent property of the cable-supported bridge decks increasing the importance of aerodynamic behavior. The shape of the bridge deck plays an important role and aerodynamic performance can be improved by shaping the bridge deck appropriately without requiring any post-construction structural or aerodynamic counter-measures. There are a number of important shaping parameters for conventional bridge decks. Their influences on aerodynamics as well as response should be well understood for shaping the bridge deck efficiently and facilitating the bridge deck design procedure. In this context, the present study examined the influence of various important shaping parameters on aerodynamic responses of single box bridge deck by employing unsteady RANS simulation. Detailed verification and validation studies were carried out for various bluff bodies and bridge sections to check the performance of two-dimensional unsteady RANS. The main parametric study was devoted for single-box bridge deck with and without fairing due to their frequent application for long-span bridges. A large number of practical bridge decks were surveyed for obtaining general idea about the shaping parameters and their range in practical bridges. Important shaping parameters such as top plate slope (ζT), bottom plate slope (ζB), side ratio (R) and width ratio (W) were considered as a main parameters of interest. Further, practical issues like, Reynolds number (ReB) effects, influence of handrail type, effects of curb and inspection rail on aerodynamic response and flow fields were also researched. Both for bridge deck with and without fairing, the influence of various shaping parameters on static force coefficients were investigated. It was found that the response altered significantly due to variation of shaping parameters and showed minimal value for particular combination of shaping parameters. By exploiting pressure, velocity and vorticity distribution, obtained steady-state

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