Function
Apply scale factors to modify the section properties of a section for the linear elements (Truss, Tension-only, Compression-only, Cable, Gap, Hook & Beam Elements). It is applied at the element level regardless of the section ID assigned to the element.
Unlike the Section Stiffness Scale Factor function, the Element Stiffness Scale Factor function cannot be used during the construction stage analysis.
Purpose of Element Stiffness Scale Factor
This factor allows engineers to:
1. Model cracked sections in reinforced concrete structures by reducing stiffness.
2. Apply stiffness adjustments for design codes that require effective stiffness modifications.
3. Account for long-term effects such as creep and shrinkage in concrete structures.
Difference Between Section Stiffness Scale Factor and Element Stiffness Scale Factor
Section Stiffness Scale Factor: Applied to all elements that use the modified section.
Element Stiffness Scale Factor: Applied to individual elements, allowing more localized control.
If both factors are applied to the same element, the Element Stiffness Scale Factor takes precedence.
Call
From the main menu, select [Properties] > [Section Properties] > [Section Manager] > [Element Stiffness Scale Factor]
Input
Boundary Group
Boundary Group Name: Select a Boundary Group defined in Model > Group > Define Boundary Group. If a Boundary Group has not been defined, specify default.
Option
Add/Replace: Add new (shear and bending) stiffness scale factors to selected wall elements, or replace previously defined stiffness scale factors.
Delete: Delete stiffness scale factors previously assigned to specific wall elements.
Stiffness Scale Factor
Area: Cross-sectional area
Asy: Effective Shear Area resisting shear forces in the element local y-axis
Asz: Effective Shear Area resisting shear forces in the element local z-axis
Ixx: Torsional Resistance about the element local x-axis
Iyy: Area Moment of Inertia about the element local y-axis
Izz: Area Moment of Inertia about the element local z-axis
Weight: Weight density used for calculating self-weight