Component actions for the specified lateral force-resisting systems shall be in accordance with this section. Components shall be modeled according to Sections 1.5 and 1.6. Definitions for member criticality and requirements for force- and deformation-controlled members are provided in the applicable building code.
User Note: Definitions for member criticality are provided in ASCE/SEI 7, Chapter 16.
1.7.1 Special Moment Frames (SMF)
Component actions for SMF systems shall be designated as force-controlled or deformation-controlled and their criticality shall be as designated per Table A-1.7.1.
User Note: Substantiated guidelines for nonlinear modeling of steel moment frames include ANSI/AISC 342 and Guidelines for Nonlinear Structural Analysis for Design of Buildings, Part IIa—Steel Moment Frames (NIST GCR 17-917-46v2), or equivalent.
1.7.2 Special Concentrically Braced Frames (SCBF)
Component actions for SCBF systems shall be designated as force-controlled or deformation-controlled, and their criticality shall be designated in accordance with Table A-1.7.2.
1.7.3 Eccentrically Braced Frames (EBF)
Component actions for EBF systems shall be designated as force-controlled or deformation-controlled, and their criticality shall be designated per Table A-1.7.3.
1.7.4 Buckling-Restrained Braced Frames (BRBF)
Component actions for BRBF systems shall be designated as force-controlled or deformation-controlled, and their criticality shall be designated per Table A-1.7.4.
1.7.5 Special Plate Shear Walls (SPSW)
Component actions for SPSW systems shall be designated as force-controlled or deformation-controlled, and their criticality shall be designated per Table A-1.7.5.
1.7.6 Composite Plate Shear Walls—Concrete Filled (C-PSW/CF)
Component actions for C-PSW/CF systems shall be designated as force-controlled or deformation-controlled, and their criticality shall be designated per Table A-1.7.6.
1.7.7 Gravity Framing Systems
When included in the model, the requirements for gravity systems shall be as follows:
- (a) Component actions for gravity systems shall be designated as force controlled or deformation controlled, and their criticality shall be designated per Table A-1.7.7.
- (b) Gravity steel beams: Model bare steel beams or composite beam as elastic.
- (c) Gravity columns: For analysis to larger drifts (story drift ratios greater than 0.02), the columns should be modeled as inelastic. If the gravity columns meet the moderately to highly ductile requirements, their inelastic response may be modeled in accordance with Section 1.5.3.
- (d) Model the behavior of partially restrained gravity connections according to Section 1.6.2.