In-plane linear dynamic behavior and impact of key system parameters of low-sagged cable network

Abstract

The use of a cross-tie is one of the effective countermeasures to suppress the undesired stay cable vibrations. It has been successfully applied on different cable-stayed bridges but the mechanics behind the cross-tie are not fully understood. Most of the studies dedicated to understand the dynamic behavior of the cable network assumed the main cables as taut cables. This assumption is acceptable on small to medium-sized cable-stayed bridges, however, in case of long span bridges, this assumption is unjustified. Therefore, in the current study, the in-plane modal behavior of a cable network is explored by considering the cable sag. An analytical approach is used to develop the characteristic equation of a basic sagged cable network. The in-plane modal behavior of the sagged cable network is compared with the taut cable network and also with the single sagged cable. The role of different system parameters, mainly the cross-tie stiffness and the cable sag, is explored to understand the in-plane modal behavior of a sagged cable network. During the parametric study, a comparison is also drawn with the conventional taut cable network and an in-depth discussion is made to discuss the role of different system parameters.