Выражение встречается в следующем контексте:
Preliminary calculations for material thickness of just 25 mm in textile-reinforced concrete resulted in a span of 9 m and structural depth (rise) of 350 mm. In order to be able to accommodate the tension forces, triple carbon reinforcement with cross-sectional area of 113 mm2/m was incorporated in the component.

Заранее спасибо