ABSTRACT
Long span urban arch bridges often adopt non-load-carrying auxiliary cables to enhance the aesthetic performance. These auxiliary cables are susceptible to adverse vortex-induced vibrations (VIV) under wind excitation, leading to fatigue fracture at cable anchorage ends. This paper investigates the fatigue performance of auxiliary stay cable anchorage ends under VIV in a tied-arch bridge. Firstly, a joint probability density distribution of wind speed and wind direction is established based on the angular-linear function. A finite element model of the cable anchorage end is developed. Furthermore, the stress distribution at the anchorage end under VIV excitation of the cable is investigated. Finally, the time-dependent behavior of the fatigue reliability index of the auxiliary cable is analyzed. The results indicate that, under the influence of VIV, significant out-of-plane stresses are induced at the anchorage end, leading to a decrease in the fatigue reliability index during service life.
