Abstract
Non-linear snap-through behavior of a thin concrete shell roof characterized by free edges, or free edge members supported by several columns, is considerably influenced by the boundary conditions and the edge disturbances developed in the prebuckling state. This paper presents a method of realizing all four natural boundary conditions along a free edge of a roof shell model subjected to external pressure. The experimental method is shown to be useful for investigating non-linear behaviour of circular cylindrical roof shell models with free generator edge beams. The method has a wide applicability to a variety of roof shell models with free edge members lying on a horizontal plane.
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