On Wind-Induced Response Analysis of a Inclined Circular Cylinder Using Quasi-Steady Aerodynamic Forces

Abstract

Dry Inclined Cable Galloping may occur with long stay cables of cable stayed bridges, and similar response may occur with general circular cross section members. In order to clarify its characteristics, a series of wind tunnel tests was conducted with an inclined circular cylinder model of small aspect ratio. Reproducibility was generally good, and response was observed around 9m/s (Re=1.6×10⁵), it decreased at a little higher wind speed, and large amplitude response was observed at higher wind speed. Aerodynamic coefficients were measured with respect to the tests, and response analysis using quasi-steady aerodynamic forces was discussed. As a result, it was shown that the wind-induced response may possibly be caused by unsteady aerodynamic forces at nondimensional wind speed larger than 100.