Effective Length Options
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Description
Effective length calculation options are part of a Member 1D. These options are available for 1D members when the section material is steel. They define the properties relating to design from the interaction of the member with the rest of the structure. Refer to Member Design properties to read more.
Properties
 | Text | Calculation Option | The option of the Effective Length calculation. |
| Text | Member Restraint Start | Restraint Description Syntax for Member End Restraint at Member Start |
| Text | Member Restraint Start | Restraint Description Syntax for Member End Restraint at Member End |
| Text | Restraint Along Member | The internal continous restraint along the member. |
| Text | Intermediate Bracing Point Restraints | The internal restraint at intermediate bracing points of the member. |
 | Generic | Effective Length About Y | The user-defined effective length about y. |
| Generic | Effective Length About Z | The user-defined effective length about y. |
| Generic | Effective Length LTB | The user-defined effective length for lateral torsional buckling. |
 | Number | Destabilising Load Height | Destabilising Load Height in model units |
| Text | Load Position | The destabilising load height is relative to this reference position. |
| Number | Factor Lsy | Moment Amplification Factor, Strong Axis |
| Number | Factor Lsz | Moment Amplification Factor, Weak Axis |
| Number | Equivalent uniform moment factor for LTB | Override the automatically calculated factor to account for the shape of the moment diagram in lateral torsional buckling design equations. This override is applied for all bending segments in the member. This override is applied to the following variable for each design code: AISC 360: C_b AS 4100: alpha_m BS 5950: m_LT CSA S16: omega_2 EN 1993-1-1 and EN 1993-1-2: C_1 Hong Kong Code of Practice: m_LT IS 800: C_mLT SANS 10162-1: omega_2 |
Note: the above properties can be retrieved using the Get Effective Length Options component