In typhoons, frames rarely collapse — gable walls peel off and roof sheets fly. The defense is in the details.
Post-typhoon damage surveys show a pattern: portal-frame plants rarely collapse wholesale — losses come from gable walls falling and roof sheets peeling off. These are exactly the parts often simplified in design.
Wind columns: gable walls need wind columns to carry wall loads to foundations. The connection to the roof beam should use slotted holes allowing relative slip as the roof deflects, instead of dragging the frame sideways.
Wind uplift: pressure coefficients at eaves, ridges and edge zones far exceed those mid-roof. Purlin spacing should tighten there and screw counts follow calculation. In typhoon zones, 360° standing-seam roofing is worth the extra cost over ordinary lapped sheets.
For coastal projects in the Philippines and Vietnam, we apply typhoon-zone detailing by default.
Shanghai Xionglan Steel Structure · Exported to 60+ countries · EN 1090 CE certified · Engineer reply within 24 hours
Talk to an engineer View product systems