Problems of Dynamic Load Determination on a Facing Layer of Hinged Facade Systems in Wind Runs

The requirements to the method of determining the dynamic loads on the facing layer of enclosing structures of the building with suspended facade systems (SFS) under wind gusts are developed. The distribution of the external wind pressure on the facing layer of the facades with SFS does not depend on the processes of flowing inside the air gaps of SFS. This is due to the low degree of permeability of the facing layer in all practically significant cases. Therefore, the problem of determining the external wind pressure is a problem independently solved by known conventional methods. However, the knowledge of local wind pressure on the outer side of the SFS facing layer does not yet indicate the value of the wind load on the facing layer itself, since the internal pressure in the ventilated gap of the SFS is determined by the integral balance of the air flows in and out in all communicating subfacing volumes. This means that any attempt to set a value of local internal pressure by the known value of external pressure is incorrect. Internal pressure is not a local, but an integral parameter. To determine it, it is necessary to apply a mathematical approach to calculating the balances of the inflowing and outflowing air under non-stationary conditions and depending on the conditions of the congestion of flow volumes in the sub-facing layer of the SFS. The formulation of the problem should include the possibility of taking into account the effect of delay when relaxing the internal pressure in the sub-facing layer of the SFS under the influence of sharply changing in time external pressure on the facades of the object with wind gusts.

V.G. GAGARIN^{1, 2}, Doctor of Sciences (Engineering), Corresponding member of RAACS (This email address is being protected from spambots. You need JavaScript enabled to view it.);
S.V. GUVERNYUK^{1, 3}, Candidate of Sciences (Physics and Mathematics) 

¹ Scientific-Research Institute of Building Physics of the Russian Academy architecture and construction sciences (21, Lokomotivniy Driveway, Moscow, 127238, Russian Federation) 
² National Research Moscow State University of Civil Engineering (26, Yaroslavskoe Highway, Moscow, 129337, Russian Federation) 
³ Lomonosov Moscow State University (GSP-1, Leninskie Gory, Moscow, 119991, Russian Federation)

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