9. Keyword factor EXCIT#
◊ EXCIT = F (…)
This keyword factor makes it possible to define a load for each occurrence. The operands have a meaning equivalent to those described in document [U4.54.03] with the difference that, for the DYNA_LINE operator, it is not necessary to provide all the information concerning the second members, which is automatically calculated by the operator.
9.1. Keyword CHARGE#
Load applied to the structure, previously defined using the AFFE_CHAR_MECA operator. The CHARGE keyword should only appear in the factor keyword occurrence if the TYPE_APPUI keyword is not present.
9.2. Keywords TYPE_APPUI, DIRECTION, GROUP_NO#
Keywords used in the case of seismic loads, please refer to the document [U4.63.01] for more details. The TYPE_APPUI keyword should only appear in the factor keyword occurrence if the CHARGE keyword is not present.
9.2.1. TYPE_APPUI = “MONO”#
◊ TYPE_APPUI = “MONO”
The structure is excited uniformly at all supports. You must specify the direction of excitement via the keyword DIRECTION.
9.2.2. TYPE_APPUI = “MULTI”#
◊ TYPE_APPUI = “MULTI”
Excitation is applied to only a portion of the supports. You must specify the direction of excitation via the keyword DIRECTION as well as the nodes concerned via the keyword GROUP_NO.
9.2.3. Keyword DIRECTION#
◊ DIRECTION = (DX, DY, DZ, DZ, DRX, DRZ, DRZ)
Component of a vector giving the direction of the earthquake in the global coordinate system.
9.2.4. Keyword GROUP_NO#
◊ GROUP_NO = g_knot
List of the groups of nodes in the structure subjected to the excitation in the case with TYPE_APPUI. If TYPE_APPUI = “MULTI”, you must specify the keyword GROUP_NO. If TYPE_APPUI = “MONO”, the GROUP_NO keyword is not mandatory. However, the occurrences for the keyword GROUP_NOdevront will be the same for all occurrences of the keyword factor EXCIT.
9.3. Operands FONC_MULT, COEF_MULT, FONC_MULT_C, COEF_MULT_C, ACCE,,, VITE, DEPL, PHAS_DEG, PUIS_PULS#
Multiplying coefficient or function of the assembled vector. In the transitory case, it is mandatory to provide a function of time. In the harmonic case, it is possible to provide a complex coefficient or function depending on the frequency. Refer to document [U4.53.03] for more details on the use of these keywords.