| Summary |
As is shown in the previous paper air-inflated beam structures have some load carrying capacity even after wrinkles are produced. In the case of design it is important to know the ultimate strength of structure and each element. At this point of view this paper discusses the load carrying behaviors of air-inflated beam and arch in their finite deflection range and collapse after wrinkles are produced by means of theoretical approach and numerical analysis (FEM). As the result in the condition of pure bending the collapse moment is approximately 1.9 times as large as wrinkles occurring moment. However in the condition of concentrated or distributed loading the ratio of collapse load to wrinkles occurring load becomes smaller， especially in the case of arch.
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