Optimal control on structural response using outrigger braced frame system under lateral loads

ABSTRACT This paper considers the static and dynamic analysis of a high-rise structure under the lateral loads. Firstly, the static analysis was carried out for four different structural systems (i.e. moment-resisting frame, building frame, and outrigger braced frame (OBF) system). Under the same static loading, it was found that the outrigger braced system provides an optimal control to high-rise structure. To earn these results, an analytical procedure was carried out that manifests the efficiency induced by the bracing system. Secondly, dynamic analysis was considered to evaluate the vibration response of a tall building. To this end, the outrigger system was compared with the Pendulum tuned mass dampers (PTMD). The parametric analysis investigates that the outrigger system provides an optimal reduction of 33% for one and 60% for two outriggers in the top displacement and drift response of the structure. This alteration in the response was verified using an analytical solution for the top and middle of the structure. The acceleration reduction capacity of outriggers was found to be 40% and PTMD with 35% respectively. Based on the comparative static and dynamic analysis OBF was found to be an effective addition to the sway frame.