Abstract: Abstract： An equilateral triangle ethylenetetrafluoroethylene (ETFE) cushion model with a side length of 2.5 m was developed based on the design method of flatpatterning. The experimental model was performed with a formdeveloping test, which was controlled and measured combining automatic pressure control, photogrammetry and laser sensor. The whole process of formdeveloping included an inflation from 0 kPa to 2 kPa, a viscoelastic creep under 2 kPa lased for 24 h, and a recovery under 0 kPa within 24 h. Some original parametric data, such as internal pressure values, shapes of upper layer and rises of lower layer were obtained. The stress distributions under different conditions were calculated based on the shapes. Some profound material mechanical properties and structural behaviors, such as elastic deformation, viscoelastic creep and creeprecovery, were revealed via the comparisons of results between experiments and numerical simulations. These results demonstrate the applicability, which will improve the popularization and application of ETFE cushion structure.

Key words: Key words： ethylene-tetrafluoroethylene (ETFE) cushion, forming design method, flatpatterning, formdeveloping, viscoelastic creep, creeprecovery, photogrammetry