PLOAD1

Bulk Data Entry Defines concentrated, uniformly distributed, or linearly distributed applied loads to the CBAR or CBEAM elements or a SET of such elements at user-chosen points along the axis.

It can also be used to define the EXCITEID field (Amplitude "A") of dynamic loads in RLOAD1, RLOAD2, TLOAD1 and TLOAD2 Bulk Data Entries.

Format

(1) (2) (3) (4) (5) (6) (7) (8) (9) (10)
PLOAD1 SID EID/

ELSETID

 TYPE SCALE X1 P1 X2 P2  
  ELSET                

Example

(1) (2) (3) (4) (5) (6) (7) (8) (9) (10)
PLOAD1 25 1065 MY FRPR 0.2 2.5E3 0.8 3.5E3  

Definitions

Field Contents SI Unit Example
SID Load set identification number.

In the static solution sequences, the load set ID (SID) is selected by the LOAD command in the Subcase Information section.

No default (Integer > 0)

  
EID/ELSETID EID:

Unique identification number for CBAR or CBEAM element.

No default (Integer > 0)

ELSETID:

A unique identification for a SET of elements. In this case, the ELSET continuation line must be specified.
Integer
Specifies an identification number for the set.
<String>
Specifies a user-defined string label for the set. 8

(Integer > 0 or <String>)

  
TYPE Load type.
FX, FY or FZ
Force in the x, y, or z direction of the basic coordinate system.
MX, MY or MZ
Moment in the x, y, or z direction of the basic coordinate system.
FXE, FYE or FZE
Force in the x, y, or z direction of the element's coordinate system.
MXE, MYE or MZE
Moment in the x, y, or z direction of the element's coordinate system.

No default

  
SCALE Determines scale factor for X1, X2. 2 - 5
LE
Length
FR
Fractional
LEPR
Length Projected
FRPR
Fractional Projected

No default

 
X1, X2 Distances along the CBAR or CBEAM element axis from end A.

If X2 ≠ X1, a linearly varying distributed load will be applied to the element between positions X1 and X2, having an intensity per unit length of bar equal to P1 at X1 and equal to P2 at X2.

If X2 is blank or equal to X1, a concentrated load of value P1 will be applied at position X1.

For X1: No default

For X2: Default = blank (Real, 0 ≤ X1 ≤ X2)

  
P1, P2 Load factors at positions X1, X2.

Default = blank (Real or blank)

  

Comments

  1. If P1=P2 and X2 ≠ X1, a uniform distributed load of intensity per unit length equal to P1 will be applied between positions X1 and X2.
  2. If SCALE=LE (length), the Xi values are actual distances along the element axis, and, if X1 ≠ X2, the Pi are load intensities per unit length of the element.
  3. If SCALE= FR (fractional), the Xi values are ratios of the distance along the axis to the total length, and (if X2 ≠ X1) Pi are load intensities per unit length of the element.
  4. If SCALE=LEPR (length projected), the Xi values are actual distances along the element axis, and (if X2 ≠ X1) the distributed load is input in terms of the projected length of the element.


    Figure 1. PLOAD1 Convention on Beam or Bar Elements

    If SCALE=LE, the total load applied to the bar is P1 (X2 - X1) in the y-basic direction.

    If SCALE=LEPR, the total load applied to the bar is P1 (X2 - X1) cosα in the y-basic direction.

  5. If SCALE=FRPR (fractional projected), the Xi values are ratios of the actual distance to the length of the bar (CBAR entry), and if X1 ≠ X2, then the distributed load is specified in terms of the projected length of the bar.
  6. Loads on CBEAM elements defined with PLOAD1 entries are applied along the line of the shear centers.
  7. If on the TYPE field of the PLOAD1 entry, the element coordinate system direction (for example, TYPE=FYE) option is selected, then the projection (SCALE=FRPR or LEPR) option is ignored and the result is the same as the SCALE=FR (or LE) option.
  8. String based labels allow for easier visual identification of sets, including when being referenced by other cards. For more details, refer to String Label Based Input File in the Bulk Data Input File.
  9. This card is represented as a pressure load in HyperMesh.