9.12        Nodal Mass / Damping / Stiffness Element

 

9.12.1     Nodal Mass Element

 

NODAL_MASS

 

 

            Element_name = NODAL_MASS

            m,   ( mass( i, m),   i = 1, ndof )    < m = 1, numat >

                  < body force data >

                  < connectivity data >

            < terminate with a blank record >.

 

 

9.12.1.1     Material Properties Data (Numat sets)

 

Note    Variable Name        Type        Default            Description

 

                      M                 integer          [0]                Geometric/material set number

 

              MASS(1,M)           real           [0.0]              Nodal mass degree of freedom 1

 

            MASS(2,M)             real           [0.0]              Nodal mass degree of freedom 2

                                                .                                               .

                                             etc.                                            .

                                                .                                               .

            MASS(NDOF,M)    real           [0.0]              Nodal mass degree of freedom NDOF

 

 

9.12.1.2     Body Force Data (units L/T2)

 

Note    Variable Name        Type        Default            Description

 

(1)                b_x1                 real           [0.0]              Body force component in the x1 direction

 

                    b_x2                 real           [0.0]              Body force component in the x2 direction

 

                    b_x3                 real           [0.0]              Body force component in the x3 direction

 

 

Notes/

(1) Body force load multipliers are used to define the components of the gravity vector b with respect to the global (x1, x2, x3) coordinate system, e.g., in SI units, b = {0.0, -9.81, 0.0} for the case x2 vertical and oriented positively upward, with g = 9.81 m/s2 and  w = 103 kg/m3.

 

 

9.12.1.3     Element Nodal Connectivity Data

 

            Consult Chapter 11 for details; for this element NEN = 1.

 

9.12.2     Nodal Damping Element

 

NODAL_DAMPING

 

 

            Element_name = NODAL_DAMPING

            m,   ( damp(i, m), i = 1, ndof )      < m = 1, numat >

                  < connectivity data >

            < terminate with a blank record >.

 

 

 

 

9.12.2.1     Material Properties Data (Numat sets)

 

Note    Variable Name        Type        Default            Description

 

                      M                 integer          [0]                Geometric/material set number

 

              DAMP(1,M)           real           [0.0]              Nodal damping degree of freedom 1

 

            DAMP(2,M)             real           [0.0]              Nodal damping degree of freedom 2

                                                .                                               .

                                             etc.                                            .

                                                .                                               .

            DAMP(NDOF,M)   real           [0.0]              Nodal damping degree of freedom NDOF

 

 

 

 

9.12.2.2     Element Nodal Connectivity Data

 

            Consult Chapter 11 for details; for this element  NEN = 1.

 

 

9.12.3     Nodal Stiffness Element

 

NODAL_SPRING

 

 

            Element_name = NODAL_SPRING

            m,   ( stif(i, m), i = 1, ndof )    < m = 1, numat >

                  < connectivity data >

            < terminate with a blank record >.

 

 

 

 

9.12.3.1     Material Properties Data (Numat sets)

 

Note    Variable Name        Type        Default         Description

 

                      M                 integer          [0]             Material set number

 

                STIF(1,M)             real           [0.0]           Nodal stiffness value DOF component 1

 

                STIF(2,M)             real           [0.0]           Nodal stiffness value DOF component 2

                        .                       .                 .

                     etc.                     .                 .

                        .                       .                 .

            STIF(NDOF,M)       real           [0.0]           Nodal stiffness value DOF component NDOF

 

 

 

9.12.3.2     Element Nodal Connectivity Data

 

            Consult Chapter 11 for details; for this element NEN = 1.

 

 

 

 

Notes . .

 

 

 

 

Notes . .

 

 

 

 

Notes . .