Abstract: Considering the special structure of space truss metal gate with large span for resisting the tide and discharging the flood in the Caoejiang River, an aging scheme was designed and implemented, in which the space truss metal gate first suffered the natural aging from solarization in the summers sun shine for 90 days; then, using the small tide of the Qiantangjiang River, the gate suffered the aging under static load to eliminate the residual stress. The residual stress was measured by the blind hole method, the residual stress eliminating effects of the natural aging and the static load aging were tracked. So the entire safe aging of the gate leaf was realized.

Key words: metal gate, space truss, residual stress, aging, static load