What dynamic impact factors are used for crane loads?

AISC/CMAA: vertical impact 25% for CMAA Class D-F, 15% for B-C, 10% for A. Lateral load = 20% of (rated capacity + block weight). Longitudinal traction = 10% of crane total weight. AISC ASCE 7-22 Chapter 4 governs.

What are CMAA service classifications?

CMAA Class A: standby/infrequent. B: light use. C: moderate use. D: heavy use. E: severe service. F: continuous severe service. Higher class requires heavier structure and more robust crane components for fatigue life.

How do I determine maximum runway beam loads?

Maximum wheel load = (crane + lifted load)/4 for 4-wheel crane × impact factor. Envelope all crane positions. Check combined vertical + lateral + longitudinal. AISC Design Guide 7 provides detailed runway beam design procedures.

Crane Load Moment Calculator

Calculate crane moment: M = P·r where P = rated load + block weight, r = radius. Structural loads on runway beams: vertical impact 25% extra, lateral 20% of hoist load, longitudinal 10% of crane weight. AISC CMAA classes.

2D stress state at a point. All stresses in MPa.

σx — Normal Stress X (MPa)

σy — Normal Stress Y (MPa)

τxy — Shear Stress (MPa)

⚙ Mechanical Note: Results are based on standard textbook formulas and ISO/AASHTO references. Always verify critical designs with applicable codes (ISO 898, AASHTO 1993, AISC, Eurocode 3) and a qualified engineer.

How to Use

Enter the values for the patient or scenario you are assessing. Calculate crane moment: M = P·r where P = rated load + block weight, r = radius. Structural loads on runway beams: vertical impact 25% extra, lateral 20% of hoist load, longitudinal 10% of crane weight. AISC CMAA classes. Use the crane load result to inform your clinical assessment.

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Frequently Asked Questions

What dynamic impact factors are used for crane loads?

What are CMAA service classifications?

How do I determine maximum runway beam loads?