StructuralCurveMoment

Line Moment on the beam

The Line moment load models load distributed over a 1D member (StructuralCurveMember), 1D member Rib (StructuralCurveMemberRib) or on a slab edge (StructuralSurfaceMember). It may be action along the whole 1D member or only on its part. It can be constant or trapezoidal, acting in three main directions X, Y, Z (global or local coordinate system).

Specification in the excel

Column header	Data type	Example / enum definition	Required	Description
Name	String	LMS1	yes	Human readable unique name of the force
Type	String	Standard	no	This property defines what the load is caused by, E.g. Standard, Wind, Snow, Self weight, Hoar Frost, Predefined, Plane Load, Water Pond, Water Pressure, Soil Pressure, Generated Water, Generated Soil
Force action	Enum	On beam On edge On subregion edge On opening edge On rib On internal edge	yes	Specifies on which type of object the force acts
Distribution	Enum	Uniform Trapez	yes	The line moment may be either constant along the 1D member or linearly variable (trapezoidal).
Direction	Enum	Mx My Mz	yes	Specifies the base direction of the load
Value 1 [kNm/m]	Double	-150	yes	Specifies the first size of the moment in kilonewton meters per meter Value1 is always closer to origin (see notes)
Value 2 [kNm/m]	Double	-180	yes, if Distribution = Trapez	Specifies the second size of the load in kilonewton meters per meter Value1 is always further from origin (see notes)
Member	String	B11	yes, if Force action = On beam	The name of the StructuralCurveMember on which the load is applied
Member Rib	String	B11	yes, if Force action = On rib	The name of the StructuralCurveMemberRib on which the load is applied
2D Member	String	S1	yes, if Force action = On edge or On internal edge	The name of the StructuralSurfaceMember on which the load is applied or to which the internal edge belongs
2D Member Region	String	R1	yes, if Force action = On subregion edge	The name of the StructuralSurfaceMemberRegion on which is the load applied.
2D Member Opening	String	O1	yes, if Force action = On opening edge	The name of the StructuralSurfaceMemberOpening on which is the load applied.
Edge	Integer	1	yes, if Force action = On edge, On opening edge or On subregion edge	The index starting with 1. The order is according to order of “edges” property at StructuralSurfaceMember, StructuralSurfaceMemberOpening or StructuralSurfaceMemberRegion on which the load is applied
Internal edge	String	ES2	yes, if Force action = On internal edge	The name of the StructuralCurveEdge on which the load is applied.
Load case	String	LC1	yes	The name of the load case to which the force belongs
Coordinate system	Enum	Global Local	yes	Defines the coordinate system in which the load is defined. For ‘Local’: the coordinate system is defined by the member on which the load is applied. See Notes for more.
Location	Enum	Length Projection	yes	Specifies whether the load is “put directly on an inclined 1D member” or whether the “projection on plan” is defined. For the ‘Local’ coordinate system, the only applicable option is ‘Length’. For the ‘Global’ coordinate system choose between ‘Length’ and ‘Projection’.
Coordinate definition	Enum	Absolute Relative	yes	Selects the coordinate system that is used to define the length of the line load. Relative means without units. To define length of the load in meters input absolute
Origin	Enum	From start From end	yes	Specifies the origin of the coordinate system used for the definition of the length of the force
Extent	Enum	Full Span	yes	Defines if a load is extended just over a span instead of the whole 1D member, it is used if a 1D member consists of more than one span. This feature is not fully supported, only two spans are supported in the moment.
Start point [m]	Double	value in meters for Coordinate definition = Absolute 0.0 value in percentage for Coordinate definition = Relative 0.0	yes	Defines the position of the start point of the moment in relative or absolute coordinates [m]
End point [m]	Double	value in meters for Coordinate definition = Absolute 5.25 value in percentage for Coordinate definition = Relative 1.0	yes	Defines the position of the end point of the moment in relative or absolute coordinates [m]
Parent ID	String	67b35d84-3d04-47aa-aa4a-dc1263982320	no	Is filled for objects created be dividing curved geometry to series of straight line objects. Parent ID will ensure that curved edge is imported as straight parts to nonsupporting application, and back to original supporting application as curved geometry. To ensure successful round trip of segmented objects and their related objects, Parent ID needs to be present in both directions.
Id	String	39f238a5-01d0-45cf-a2eb-958170fd4f39	no	Unique attribute designation

Notes

Difference between Location type Length and Projection can be seen in the picture.

An example of use of parameter Extent is in the in the picture below. In case of Span the load acts only on the span which is defined by internal nodes

An example with Distribution type Trapez and with different values 1 and 2 can be seen in the following picture. Coordinate definition is relative, start point 0 and end point 0,3. StructuralCurveAction 1 has origin “From start” and StructuralCurveAction 2 has origin “From end”. In this case the parameter extent doesn’t make any difference, only in case of beams consisting of more parts.

For ‘Local’ coordinate system (LCS) the load is defined in the LCS of the member it is assigned to. For force action ‘On beam’ and ‘On rib’ it is the LCS of StructuralCurveMember and StructuralCurveMemberRib, respectively. For edges of 2D members the local coordinate system of an edge is used and it is created accordingly:

• X-axis is in the direction of the line/curve of the edge. The direction is specified by the order of nodes in the StructuralSurfaceMember

• Z-axis is parallel to the local Z-axis of the 2D member. For curved members local Z-axis is always perpendicular to the surface

• Y-axis is tangential to the 2D member (it is in its plane) and the direction is set by the right-hand rule