PRESTRESSED STEEL GRID ERECTED WITH BENT FORMS.

A new method for constructing one-layer steel grids erected by prestressing with the aid of recoverable bending forms if presented, followed by an approximate structural analysis. The grid elements are joined together by cables passing through them. By stressing other cables the flat grid erects itself to a vault, the shape of which is determined by the recoverable bending forms. The preliminary analysis covers the erection stages and dead, snow and wind loads during service.