{"id":23943,"date":"2026-02-11T13:44:34","date_gmt":"2026-02-11T13:44:34","guid":{"rendered":"https:\/\/support.buildsoft.eu\/?post_type=ht_kb&p=23943"},"modified":"2026-02-11T13:44:36","modified_gmt":"2026-02-11T13:44:36","slug":"minimum-tensile-reinforcement-according-to-nen-en-1992-1-1","status":"publish","type":"ht_kb","link":"https:\/\/support.buildsoft.eu\/fr\/knowledge-base\/minimum-tensile-reinforcement-according-to-nen-en-1992-1-1\/","title":{"rendered":"Minimum tensile reinforcement according to NEN EN 1992-1-1"},"content":{"rendered":"

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When calculating the reinforcement in a beam according to NEN EN 1992-1-1 (National Annex of the Netherlands), it seems as if Diamonds doesn’t show the minimum reinforcement (= 93mm\u00b2 in the beam on the left).<\/p>\n\n\n\n

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Beam calculated according to EN 1992-1-1 [- -]<\/strong><\/p>\n\n\n\n

\"\"<\/a><\/figure>\n<\/div>\n\n\n\n
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Same beam calculated according to EN 1992-1-1 [NL]<\/strong><\/p>\n\n\n\n

\"\"<\/a><\/figure>\n<\/div>\n<\/div>\n\n\n\n

However, Diamonds is correct! NEN 1992-1-1:2005 \u00a79.2.1.1 states that the minimum tensile reinforcement should be calculated as:<\/p>\n\n\n\n

  <\/span>   <\/span>\"\[A_{s.min}=min(A_{s.min1},A_{s.min2})\]\"<\/p><\/p>\n\n\n\n

\"A_{s.min1}\" is function of a minimum reinforcement ratio (see referencces below). This is the minimum reinforcement ratio that can be consulted in the material library of Diamonds. Nothing special until here.

In the case of concrete with lower strength classes, concrete structures are sometimes made heavier for practical reasons than necessary for the strength. To prevent oversized structures from being unnecessarily heavily reinforced, \"A_{s.min2}\" has been introduced in the Netherlands. \"A_{s.min2}\" equals 1.25 times the ULS-reinforcement.

The combination of both \"A_{s.min1}\" and \"A_{s.min2}\" causes the minimum reinforcement to equal zero:<\/p>\n\n\n\n