SEISMIC PERFORMANCE OF FACADE MASS ISOLATION SYSTEM IN TALL BUILDINGS

Today, in addition to the form and appearance of a building, facades also play a key role in improving the performance and comfort of residents. Among the façades used in high-rise buildings, recently, double skin façade (DSF) system have been considered. A DSF system consists of two skin layers of glasses with a cavity between the skins. Glazing facades are widely used in outer skin of DSF, due to a series of aesthetic, thermal, lightening aspects. From a structural point of view, facades in tall structures represent a critical component for buildings, due to the brittle behaviour and limited tensile resistance of glass. In this paper, a seismic control method using a DSF system, as a partial mass isolation system, is proposed in order to decrease the level of energy imparted to the main structure during seismic activities. Conventional facade brackets are replaced by isolators and dampers which can isolate facade during earthquake excitation. The feasibility and potential of Facade Mass Isolation (FMI) method to control and mitigate the maximum vibrations and stresses due to seismic events on tall buildings with glazing envelopes is investigated via numerical simulations. A dynamic analysis of the response by time history is used for facade mass isolated structure. The behaviour and performance of structures with DSF and FMI technique are investigated and compared with conventional earthquake-resisting structures. Results show suitable behaviour of structure and also reduction of deformations in facade components.

کلیدواژه ها:

Partial Mass Isolation ، Facade Mass Isolation ، Passive Structural Control ، Double-Skin Facade ، Tall Buildings