Structural System - CFS framing: one-story high-bay + attached 2-story office wing
Lateral Force Resisting System - Transverse (high-bay open-front direction): COLD-FORMED STEEL SPECIAL BOLTED MOMENT FRAMES (CFS-SBMF, AISI S400 Section E4). All other lines: CFS strap-braced walls (flat strap, S400 E3). MIXED SYSTEMS - see combination rules.
Number of stories - High-bay: 1 tall story (eave 24'-0"); office wing: 2 stories (11'-0" + 11'-0", roof 22'-0")
Analysis procedure - ELF; SDC D
Design standards - AISI S100, S240, S400, ASCE 7
Project - Light-industrial / maker space with storefront open front and attached office

## Material Properties
- SBMF beams: CFS hollow (HSS-type cold-formed) or built-up channel assemblies (2- to 4-ply); SBMF columns: HSS cold-formed (up to 12x12); **ASTM A500 Gr. C / A1003 Gr. 50** (agent to select per S400 E4 prequalification limits)
- SBMF connections: BOLTED beam-to-column with snug-tight high-strength bolts (energy dissipation via bolt slip/bearing per S400 E4 - this is the system's defining mechanism)
- Strap-braced walls: straps ASTM A1003 Gr. 50, both faces
- High-bay roof: CFS trusses spanning 50'-0", bare deck + insulation; office floors: CFS joists + WSP + gyp-crete
- Studs Gr. 50 bearing; screws C1513

## Gravity Loads
| Load Type | Magnitude |
|------------|-----------|
| High-bay Roof Dead | 16 psf; Office Floor Dead 35 psf; Office Roof Dead 20 psf |
| Cladding | 12 psf insulated metal panel; storefront glazing 8 psf on the open front |
| Live | Office 50 psf + 15 psf partitions; high-bay floor is slab-on-grade (no framed floor); mezzanine catwalk 40 psf along high-bay north wall (4' wide, at +12'-0") |
| Roof Live | 20 psf Lr both roofs; Snow pg = 25 psf, drift at the 2-ft roof step (24' vs 22') |

## Seismic / Wind Design Data
- SDS = 1.00 g, SD1 = 0.48 g, Site Class D, Risk Cat II, Ie = 1.0, SDC D
- CFS-SBMF: **R = 3.5, Cd = 3.5, Omega_0 = 3.0**; SDC D height limit 35 ft (24 ft OK)
- Strap-braced walls: R = 4, Cd = 3.5, Omega_0 = 2
- COMBINATION RULES (ASCE 7 12.2.3.3 / 12.2.2): different systems in ORTHOGONAL directions - each direction uses its own R; but where SBMF and strap walls act in the SAME direction (office wing transverse vs high-bay transverse are the same global axis), the agent must apply the least-R rule along that axis or justify structural separation
- Wind: V = 110 mph, Exposure C; open-front storefront - check wind on the long solid rear wall driving the SBMF line

## Building Plan Geometry (L-PLAN, TWO EAVE HEIGHTS)
- HIGH-BAY: 100'-0" (E-W) x 80'-0" (N-S), eave 24'-0", flat roof; SOUTH face is the open storefront (no solid wall permitted - this is why SBMF exists here)
- OFFICE WING: 80'-0" (E-W) x 40'-0" (N-S) attached at the high-bay's NE corner, extending east; 2 stories, roof 22'-0"
- Re-entrant corner at the junction
- High-bay interior: clear span N-S (trusses 50' + 30' spans on one interior column line at 50' from south face)

## LFRS Layout
N-S (transverse, through the open front): EIGHT CFS-SBMF portal frames across the high-bay at 12'-6" o.c. (the 24-ft open story is drift-governed; column bases may be PINNED or FIXED -- agent chooses and justifies; fixed bases permitted with capacity-designed anchorage) (columns at south storefront line and at the interior column line); office wing N-S: strap-braced panels on its east and west end walls (2 panels each, both stories)
E-W (longitudinal): high-bay north wall: 4 strap-braced panels x 10'-0"; high-bay rear (west) portion of south line has NO panels (open); office wing E-W: strap panels on north and south walls (2 x 10'-0" each, both stories)

## SBMF Design Requirements (AISI S400 E4 - agent outputs)
- Beam/column sections within E4 prequalification limits; bolted connection design for the expected moment at design story drift (bolt slip + bearing model per S400)
- Capacity design: columns and connections for expected beam strength; base plates + anchor rods for Omega_0 or capacity forces
- Story drift of the 24-ft portal at Cd x elastic: SBMF systems are drift-flexible - check vs 0.025hsx and glazing serviceability (storefront)
- P-delta on the tall open story

## Member / System Design Requirements (other)
- Strap panels per S400 E3 capacity-design chain (Ry Fy Ag)
- High-bay bare-deck diaphragm (flexible): distributes N-S shear equally-ish to the 4 SBMF portals by tributary width - verify end-frame vs interior tributary
- Snow drift at the roof step onto the office roof
- Collector at the high-bay/office junction (Omega_0)
