1. Transverse Crane Braking Loads & Lateral Sway Control
When a 30-ton crane trolley brakes with a full load, lateral dynamic thrust ($H_{crane}$) is exerted on the supporting runway girders.
Under **AISC Design Guide 7 (Industrial Buildings)**:
- Lateral surge load is calculated as 20% of the sum of the lifted load and crane trolley weight.
- Champion incorporates built-in heavy knee-braces and tubular portal frames that limit total horizontal crane rail sway to **L/600**, preventing trolley wheel flange binding or rail misalignment.