| 摘要 |
A load-supporting construction element, for spanning a pair of spaced-apart supports and adapted to form a wall, floor, deck or roofing structure or a support for a wall, floor, deck or roofing surface which consists of a sheet-metal plate of generally rectangular-plan configuration and a plurality of troughs and crests in alternating relationship and of trapezoidal cross-section. The apices of the troughs and/or crests are provided with integral (unitary) ridges concave in the direction in which the corrugation bulges and of trapezoidal or arcuate cross-section. The flanks of the trapezoidal corrugations are stepped. |
