4-Story Composite Office, Chicago — 480-Ton Steel Package

Composite beam AISC 360-22 §I3.2 Shear studs ASCE 7-22 US steel Office

Project summary

AISC 360-22 · A992 Gr.50 W-shapes · A572-50 plate · AISC §I3.2 composite

Mark	Section	Qty	Material	Notes
CB01–CB16	W21×44	16 pcs	A992 Gr.50	Composite beam, §I3.2
C01–C08	W14×120	8 pcs	A992 Gr.50	Column, §E3 flexural buckling
BP1–BP8	PL 1/2×18×24″	8 pcs	A572-50	Base plate

Composite beam design — AISC 360-22 §I3.2

Section W21×44

Slab 5″ NW at 3 ksi

Stud size ¾″ dia × 3″ long

Stud grade A108 (per §I8)

Total studs 192 studs (12/beam)

Spacing 24″ on center

Max utilisation 81% (§I3.2)

Deflection L/360 ✓

Studs per beam 12 studs/beam × 16 beams

Concrete strength f′c = 3 ksi NW

Slab depth 5 in. normal weight

Column design

AISC 360-22 §E3 (compression) + §F2 (flexure) + §B4.1 compact classification

Member	Section	Check	Code ref	Utilisation	Result
C01–C08	W14×120	Compression §E3	AISC 360-22 §E3	78%	✓ PASS
C01–C08	W14×120	Flexure §F2	AISC 360-22 §F2	41%	✓ PASS
C01–C08	W14×120	N+M §H1-1a	AISC 360-22 §H1	78%	✓ PASS

Connection details

AISC 360-22 §J2 (welds) · §J3 (bolts) · AISC RCSC 2020

Type	Bolt grade	Dia	Qty/conn	Shear	Code ref
Shear tab (beam–column)	A325-N	3/4″	4	Vu = 28 kips	AISC 360-22 §J3
Base plate (anchor rods)	F1554 Gr.36	1-1/4″	8	4 per column	AISC DG-1 §3.3

Design loads — ASCE 7-22

Chicago IL · LRFD load combinations §2.3

Parameter	Value	Reference
Ground snow pg	25 psf	ASCE 7-22 Fig. 7.2-1 — Chicago, Zone C
Roof snow ps	38 psf	§7.3 sloped roof factor Cs
Basic wind V	105 mph	ASCE 7-22 Fig. 26.5-1B, Exposure B urban
Seismic SDS	0.15g	Chicago Fig. 22-2, SDC B

Member utilisation — AISC 360-22

Composite beams §I3.2 · Columns §E3/§F2 · LRFD §B3.1 · max governing: 81%

Member	Section	Check	Code ref	Utilisation	Result
CB01	W21×44	§I3.2 composite	AISC 360-22 §I3.2	81%	✓ PASS
CB01	W21×44	Deflection L/360	AISC 360-22 §L3	72%	✓ PASS
CB02	W21×44	§I3.2 composite	AISC 360-22 §I3.2	79%	✓ PASS
CB03	W21×44	§I3.2 composite	AISC 360-22 §I3.2	77%	✓ PASS

Time & cost comparison

Manual EOR time ~55 hrs

Rate $120/hr

Manual cost $6,600

FrameAI runtime 8 min

Engineer QA 0.5 hr

FrameAI cost ~$72

Saved on this job $6,528

Annual (12 projects) $78,336

Bolt schedule

AISC RCSC 2020 · Installation per RCSC §8.2 · AISC 360-22 §J3

Connection	Grade	Diameter	Qty/conn	Total bolts	Install torque
Shear Tab (J2)	A325-N	3/4″	4	64	315 ft-lb
Base Plate (BP1)	F1554 Gr.36	1-1/4″	8	64	900 ft-lb

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Shop drawings, connection report, DSTV NC1, BOM Excel — for this 480-ton composite office project.

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Project info

Code	AISC 360-22 §I3.2
Tonnage	480 tons
Members	24 members
Shear studs	192 studs
Connections	16 connections
AI runtime	8 min
Manual time	~55 hrs
Saved per job	$6,528

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