Operands ========= Keyword MATERIAU ---------------- .. code-block:: text MATERIAU Keyword repeatable factor allowing the description of the characteristics of the materials that make up the layers of a laminate floor, material by material. The assignment of materials to the various layers is done by the occurrence number of the keywords factors MATERIAU. It is not allowed to ignore some materials. For example, you cannot use materials 1, 2, and 4 under COUCHE or COUCHE_AUTO without affecting occurrence number 3. The command stops in error in this case. On the other hand, we can define 4 materials and use only the first ones, 1 and 2 for example. Operands E/NU/ RHO/AMOR_HYST ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Allow to define respectively the real values of the Young's modulus, the Poisson's ratio, the density and the hysteretic damping of the current material. Keyword COUCHE -------------- .. code-block:: text COUCHE Keyword repeatable factor allowing the geometric description and the assignment of materials layer by layer, the possible positioning of a source and receiver level in relation to the current soil layer, which is necessary for the calculation of Green functions. *Note* **:** *The description of the layers must be done in the vertical descending direction* Operand NUME_MATE ~~~~~~~~~~~~~~~~~~~ .. code-block:: text ♦ NUME_MATE = number Material number in the order in which the occurrences of the keyword MATERIAU in the current layer are described Operands EPAIS/SUBSTRATUM ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Or we define the layer as substratum (SUBSTRATUM =' OUI '), generally for the last layer. Or we provide the value of the thickness of the layer. Operands SOURCE/RECEPTEUR ~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Allow you to define whether a source and/or receiver level has been respectively positioned at the top of the current layer if 'OUI'. Keyword COUCHE_AUTO ------------------- .. code-block:: text COUCHE_AUTO Single factor keyword allowing the automated definition of soil layers, in parallel with the manual mode of the keyword COUCHE. Z0 operand ~~~~~~~~~~~ .. code-block:: text ◊ Z0 = z0 Vertical dimension of the free surface (argument identical to that of CALC_MISS [:ref:`U7.03.12 `]). If you do not enter its value, then the operator will detect the highest vertical dimension of GROUP_NO/GROUP_MA, in accordance with GROUP_MA_INTERF if it is defined. Operand HOMOGENE ~~~~~~~~~~~~~~~~~~ ♦ HOMOGENE =/'OUI', .. code-block:: text /'NON', This keyword allows you to specify whether the ground is homogeneous or not. In the second case, it is mandatory to define the soil stratification with the operands NUME_MATE/EPAIS_PHYS and the substratum material (the lowest homogeneous and semi-infinite soil layer) with NUME_MATE_SUBSTRATUM. The number of values of EPAIS_PHYS must be consistent with that of NUME_MATE: each layer must have an associated material, so if we have n layers (so n values in the list of reals of EPAIS_PHYS) then the list of integers of NUME_MATE must also be of length n. In the homogeneous case, we will take the first material from the keyword MATERIAUet, all that remains is to define the position of the substratum with EPAIS_PHYS which will only contain one value. In the case of a sunken foundation, the substratum must be positioned lower than the base of the foundation. Operand SURF ~~~~~~~~~~~~~ ◊ SURF =/'NON', [DEFAUT] .. code-block:: text /'OUI', Allows you to indicate whether the foundation is superficial or not. If it is not, then it is also necessary to define certain operands such as GROUP_MA or GROUP_NO which will make it possible to define lateral sublayers of soil. In the superficial case, these operands don't make sense, along with others: NOMBRE_RECEPTEUR, TOLERANCE, DECALAGE_AUTO, GROUP_MA_INTERF, and MAILLAGE. Operand EPAIS_PHYS ~~~~~~~~~~~~~~~~~~~~~ Allows you to indicate the thickness of the soil layers. In the case of homogeneous soil, it is just used to position the substratum (which must be under the lowest point of the foundation). Operands NUME_MATE/NUME_MATE_SUBSTRATUM ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Allow you to associate a material (according to its number in the order in which the occurrences of the keyword MATERIAU are described) to each soil layer and to the substratum. Operands GROUP_MA/GROUP_NO/MAILLAGE ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Allow to give the mesh group or group of nodes that will be used to define the vertical dimensions of the nodes of the interface mesh, for the definition of soil sub-layers, therefore only in the case of a sunken foundation. We recommend the use of GROUP_MA because we can then detect whether the foundation mesh is quadratic or linear, which cannot be done with a group of nodes. This detection is important because MISS3D only takes into account linear discretization: the middle nodes must therefore be ignored for the definition of soil sub-layers and therefore the positions of the associated sources and receivers. The mesh size of the model must also be specified. Operand NOMBRE_RECEPTEUR ~~~~~~~~~~~~~~~~~~~~~~~~~~~ Define the number of sublayers in the ground table that correspond to the sunken part of the foundation, *cf.* documentation U2.06.07. The default value is four per element and only one even value is allowed. Operands GROUP_MA_INTERF/TOLERANCE ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ The definition of GROUP_MA_INTERF will make it possible to trigger a consistency check between this group of elements of the FEM - BEM Aster- MISS3D interface and the GROUP_MA/GROUP_NO argument. We therefore check the vertical dimensions of the nodes, with a certain relative tolerance, which is equal to 1.E-5 by default. This check only makes sense if the foundation mesh respects the rules of the U2.06.05 documentation and which are imposed by MISS3D, which considers a 1D vertical discretization. On a superficial basis, this check is not relevant. Operand GROUP_MA_CONTROL ~~~~~~~~~~~~~~~~~~~~~~~~~~~ Allows control points in the ground to be defined, similar to what is done in CALC_MISS [U7.03.12]. The floor table must in fact take into account the presence of control points, as indicated in the U2.06.07 documentation. If all control points are on the free surface, you do not need to enter the GROUP_MA_CONTROL keyword. Operand DECALAGE_AUTO ~~~~~~~~~~~~~~~~~~~~~~~~ ◊ DECALAGE_AUTO =/'OUI', [DEFAUT] .. code-block:: text /'NON', If the position of the boundary between two soil layers (with a high contrast of materials) corresponds exactly to the base of the buried foundation, this can lead to a numerical singularity in MISS3D. Thanks to this option, it is therefore proposed to automatically shift the limit of these soil layers. To do this, we will shift this limit of the thickness of an underlayer upward (for example by the height of a quarter of an element if we have left the value of NOMBRE_RECEPTEUR to four). Operand TITRE -------------- .. code-block:: text ◊ TITRE = title Allows the user to define a title for the floor table. Operand INFO ------------- Indicate a print level for information in the "MESSAGE "file: INFO = 1: no printing INFO = 2: impression of the floor table