1. Uplift Mechanics in Tension Fabric Structures
Unlike heavy concrete warehouses where dead load dominates design combinations, lightweight clear-span tension fabric buildings are governed by **aerodynamic wind uplift** ($W$). Under hurricane gusts of 160–185 km/h, the roof arch acts as an aerodynamic wing, creating massive net upward suction that must be resisted by base anchorage.
Under **ASCE 7-16 Equation 2.4-6**, the critical load combination is:
$$0.6 D + 0.6 W$$
Because dead weight ($D$) is minimal (only 25–40 kg/m² for galvanized truss plus membrane), the base connection must deliver immense tensile hold-down force to prevent footing pull-out.
2. Geotechnical Capacity of Helical Screw Anchors
Champion engineered heavy-duty hot-dip galvanized **Helical Ground Screw Anchors (Ø76mm to Ø114mm shafts with continuous 250mm–350mm helix plates)**:
- Installed in minutes using standard skid-steer or mini-excavator hydraulic drive heads.
- Individual ultimate pull-out capacity ranges from **45 kN to 120 kN per anchor** depending on standard penetration test (SPT) N-values.
- Cluster configurations with dual or triple battered angles provide immense lateral shear resistance without pouring a single drop of concrete.