$$$$ FRONABS NOTICE CHAT 11/09/12 21:16:20 7124 DATE 11/09/12 Procedure FRONABS Voir aussi : ----------------- RIG1 = FRONABS TAB1 ( TYP_FRON ) NHARM Description : ------------- The FRONABS procedure makes it possible to create absorbing boundaries of LYSMER or WHITE type used in the calculations of the ground-structure interaction. These boundaries which are composed of viscous dampings aim at avoiding, as best as possible, the wave reflection on the edge of the mesh at the ground : - the LYSMER type boundary absorbs all the energy of the plane waves with normal incidence. It is used in the deconvolution of the ground seismic motion; - the WHITE type boundary ensures an optimum energy absorption efficiency when several waves come with different angles of incidence at the same time. Contents : ---------- Input data : ----------- TAB1 : TABLE containing the following indices in letters 'FRONTIERE' : boundary geometrical support, composed of SEG3 type elements either horizontal or vertical in 2D : PLANDEFO, AXIS, FOUR 0,1 'MASSE_VOLUMIQUE' : ground density 'POISSON' : Poisson's ratio of the ground 'YOUNG' : Young's modulus of the ground TYP_FRON : MOT indicating the type of boundary used : 'LYSMER' (by default) or 'WHITE'. NHARM : ENTIER number of harmonics in case of MODE FOUR option ( 0 or 1 ) Output data : ----------- RIG1 : 'RIGIDITE' type object of 'AMORTISSEMNT' subtype containing the damping matrix of the absorbing boundary Note : -------- The procedure neither deals with oblique boundaries nor with three-dimensional models.
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