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Calculation maximal deflection
Generally two main situation are required to be checked:
- Total deflection - The appearance and general utility of the structure could be impaired when the calculated sag of a beam, slab or cantilever subjected to quasi-permanent loads exceeds maximal total deflection. The sag is assessed relative to the supports. Pre-camber may be used to compensate for some or all of the deflection but any upward deflection incorporated in the form-work should not generally exceed span/250. The value of maximal total deflection for 1D member is expressed as relative value to length of the span of 1D member, see "Maximal total deflection for 1D member" . The value of maximal total deflection for 2D member is expressed as absolute value and this value is directly loaded from concrete setting or concrete 2D member data , if exist (default value is 25 mm ).
- Additional deflection - Deflections that could damage adjacent parts of the structure should be limited. For the deflection after construction, span/500 is normally an appropriate limit for quasi-permanent loads. Other limits may be considered, depending on the sensitivity of adjacent parts. The value of maximal additional deflection for 1D member is expressed as relative value to length of the span of 1D member, see "Maximal additional deflection for 1D member". The value of maximal additional deflection for 2D member is expressed as absolute value and this value is directly loaded from concrete setting or concrete 2D member data , if exist (default value is 15 mm ).
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