Pressure and force measurement-based investigations on aerodynamic characteristics of a trapezoidal section

Trapezoidal cross-section with overhangs/lateral cantilevers are being increasingly adopted for medium span cable stayed bridges. Wind tunnel investigations have been carried out to study the aerodynamic characteristics of a trapezoidal section using pressure and force measurement. Simultaneous measurement fluctuating pressures overall forces under uniform, smooth inflow low various angles wind incidence, in range −15° 15° at speed 12.6 m/s. The variation mean components coefficients, viz, drag, lift torsional moment coefficients angle incidence presented. It has observed that evaluated comparable. From slope reversal coefficient occurrence maximum value coefficient, critical identified as + 6°. Further, it is stable against transverse galloping on basis quasi-steady assumption.