AISC 360-22 App.3 · CMAA Class C · W30×99 + C15×33.9

Crane Runway Beam — 25-Ton Bridge Crane

CMAA Class C 25-ton bridge crane runway — W30×99 with C15×33.9 cap channel, bearing stiffeners, fatigue check per AISC Appendix 3.

Project summary

Heavy industrial crane runway beam per AISC Design Guide 7. W30×99 runway with C15×33.9 cap channel for top-flange reinforcement. AISC 360-22 Appendix 3 fatigue check — Category B fillet weld. Web local yielding §J10 at crane wheel location. Biaxial bending under lateral crane thrust per §H2.

Member utilisation checks

AISC 360-22 App.3 + CMAA #70 • LRFD methodology §B3.1 • All ≤ 1.0 required

Member	Check	Utilisation	Result
RB1+CAP (combined)	Flexure (vertical)	79%	✓ PASS
RB1 biaxial	Biaxial bending (horiz)	73%	✓ PASS
Web stiffener STF	Web local yielding	84%	✓ PASS
RB1 (fatigue)	Fatigue — Cat B fillet weld	70%	✓ PASS

Code references

All checks reference AISC 360-22 LRFD. Connection reports cite §J2 (welds) and §J3 (bolts).

Chapter	Description	Applied to
AISC 360-22 §F2	Flexural yielding + LTB of compact W-shapes	Beams and rafters
AISC 360-22 §H1-1a/b	Combined axial + flexure interaction	Beam-columns
AISC 360-22 §E3	Flexural buckling of W-shape columns	Columns
AISC 360-22 §J3.6	Bolt tension capacity φRn = 0.75·Fnt·Ab	A325/A490 bolts
AISC 360-22 §J2.4	E70XX fillet weld: φRn = 0.75·0.6·FEXX·Aw	All fillet welds
AISC 360-22 §B3.1	LRFD: Required strength ≤ Design strength	All members
ASCE 7-22 §2.3	LRFD load combinations (1.2D+1.6S etc.)	All load cases

Time comparison

Task	Manual (EOR)	FrameAI
Member schedule extraction	45 min	<30 sec
AISC 360-22 member checks	2–3 hours	<60 sec
Connection design (A325/A490)	1–2 hours	<30 sec
BOM Excel by ASTM grade	30 min	<10 sec
DSTV NC1 CNC files	1–2 hours	<30 sec
Total	~6 hours	3 minutes