Steel LFRS - Rigid Diaphragm Analysis - EQ Loads

Description of Software Tool:

The above referenced Excel Software Tool is provided for determination of seismic loads to Steel Lateral Force Resisting System (LFRS) elements in Simple Buildings assuming Rigid Diaphragm Analysis (RDA) assumptions, where loads are distributed to resisting elements according to their relative stiffness and location away from the Center of Rotation (COR) of the rigid diaphragm.

Earthquake loads (EQ) are transferred by a Rigid Diaphragm (RC Slab or topped steel deck) at Floor Levels (one at a time) in a regular Steel building (up to 20 Stories) per RDA assumptions to up to 32 Steel LFRS elements in both orthogonal directions within the specified diaphragm; steel elements can be Braced Frames whose stiffness is derived elsewhere (SCBF’s, EBF’s, etc), or Wide Flange (WF) Columns and Beams part of a Special Moment Resisting Frame (SMRF) whose stiffness is derived internally.

This Software Tool consist of the following Design Worksheets included within:

• 1. Building Type, Size, Weight;

• 2. WF Shapes and Columns Splices;

• 3. Code Level Story Forces - EQ;

• 4. RDA Shear Forces;

• 5. RDA Displacements;

• 6. RDA Axial OT Forces;

• 7. RDA Results Summary;

• 8. SMRF Member Demands;

Users Guide to Software Tool - Page 1 (Brief Description)

Steel LFRS RDA - EQ Case Study 2 (15 Story) - Summary (excerpted from Case Studies pdf document provided)