Key Points for Wind Load Calculation of Truss Structures

Wind load calculation for truss structures should be based on the Load Code for the Design of Building Structures GB50009, using a combination of the gust factor βgz (taking 1.8~2.2) and the shape factor μs (±0.8 for closed structures, ±1.0 for open structures). For diamond grid structures, the shielding effect of members needs to be considered. The local wind pressure distribution should be corrected through wind tunnel tests or CFD simulations, with particular attention to the dynamic loads caused by vortex shedding at the node connections.

The calculation model should distinguish between static and dynamic responses. When the span is > 30m or the height-to-width ratio is > 1.5, the wind vibration coefficient μz (1.1~1.6) needs to be included. Time history analysis using finite element software (such as SAP2000) should be performed to verify that the displacement limit (H/250) of the truss under a 10-year return period wind pressure (0.35kN/m²) is met, and the bracing arrangement should be optimized to reduce wind-induced vibration.