$$$$ DECONV3D NOTICE CHAT 11/09/12 21:15:46 7124 DATE 11/09/12 procedure DECONV3D Voir aussi : DECONV ------------------ TABRESU = DECONV3D COUCHE PC FOND_SOL MOD_SOL MAT_SOL DIR GAMMAO F1 F2 (FC) (P_GAMMA) Description : ------------- This procedure allows the user to perform 3D soil-structure interaction (SSI) analysis by modelling the soil and structure with finite elements. It has two functions : - formulate the damping matrix corresponding to the viscous absorbing boundary representing the far field soil not included in the soil mesh, - calculate the seismic loading to be applied on the soil boundary by the deconvolution of the control motion given on the free surface of the soil. The resolution of the problem can be conducted afterwards in the time domain using one of the following integration procedures : - Procedure DYNAMIC for linear material behaviour, possibility to include unilateral contacts to model the uplift and the sliding of the foundation, - procedure PASAPAS in case of non linearities of the soil and the structure. Comments : ---------- Input data : ----------- COUCHE : double-indexed TABLE containing the soil properties : COUCHE.I : SOUS-TABLE relative to the ith layer of the soil which contains the following indices : 'FRONTIERE' : MAILLAGE, vertical boundary of the ith layer 'MASSE_VOLUMIQUE' : FLOTTANT, density 'POISSON' : FLOTTANT, Poisson's ratio 'YOUNG ' : FLOTTANT, Young's modulus 'AMORTISSEMENT : FLOTTANT, damping ratio PC : 'MAILLAGE', reference point inside the soil mesh or on the symmetrical axis if the analysis should be performed on an half or a quarter of the mash. FOND_SOL : MAILLAGE, lower horizontal boundary of the soil mesh MOD_SOL : MMODEL, physical model of the soil SOL : MAILLAGE, soil mesh (CUB8, PRI6 or CU20, PRI15), optional DIR : MOT, direction of the free field acceleration 'UX' for the X direction (SV wave) 'UY' for the Y direction (SH wave) 'UZ' for the Z direction (P wave) GAMMAO : EVOLUTION, free field horizontal acceleration on the surface. The beginning of this accelerogram must contain a time interval with zero acceleration at least over the first 100 steps F1, F2 : FLOTTANTS, frequencies on which the damping ratio is adjusted according to Rayleigh model. FC : FLOTTANT, cutting frequency for the deconvolution by default FC = 50 Hz P_GAMMA : TABLE containing the points on the vertical boundary for which the accelerograms will be computed Output data : ------------- TABRESU : TABLE which contains the computation results indice 'CHAR' : CHARGEMENT, seismic excitation on the soil boundary indice 'AMOR' : RIGIDITE, damping matrix of the absorbing boundary indice 'DEFO' : EVOLUTION, maximum soil strain as a function of depth indice 'ACCE' : TABLE, table which contains the accelerograms of the points defined in P_GAMMA indice 'PAS' : FLOTTANT indice 'FCDYN' : FLOTTANT, time step and cutting frequency to be used in the analysis of soil-structure interaction with DYNAMIC or PASAPAS procedure Note : -------- The procedure does not work with oblique boundaries. The SSI analysis can be performed on the whole, an half or a quarter of the system depending on the symmetry of the problem. The corresponding soil boundary should be given to the procedure. $$$$
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