| 摘要 |
A weldless grating comprising a plurality of longitudinally extending primary load-bearing members having an upper portion, a lower portion and a web located between the upper portion and the lower portion, the primary load-bearing member having a plurality of spaced-apart, generally rectangular-shaped openings in the web, the openings in each of the primary load-bearing members being aligned with the openings in adjacent primary load-bearing members. A plurality of secondary and tertiary load bearing members are provided.
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