Strengthening of structural elements by ordinary reinforcement. Many buildings that originally were constructed for a specific use now are being renovated or upgraded for a different application that may require higher load-carrying capacity.

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Strengthening of structural elements by ordinary reinforcement

parin patel

SD-1410

Strengthening:

  • Strengthening  is  modification of structure , not necessarily a damaged one, with the purpose of increasing its load carrying capacity or stability with respect to its previous condition.

  • Strengthening of  structure should be designed and constructed in accordance with appropriate building codes.

  • Many buildings that originally were constructed for a specific use now are being renovated or upgraded for a different application that may require higher load-carrying capacity.

  • As a result of these higher load demands, existing structures need to be reassessed and may require strengthening to meet heavier load requirements.

Strengthening can be achieved by....

  • Replacing poor quality or defective material by better quality material

  • Attaching  additional load bearing material

  • Redistribution of  the loading actions through imposed deformation of structural system

 

Strengthening of column.....

General :

  • The load carrying capacity of a column can be increased by encasing the existing column with concrete or providing a supplementary steel structure  which will relieve the original  of part of its load or make the column stiffer.

 strengthening of column required when:  

  • The load carried by the column is increased due to either increasing the number of floors or due to mistakes in the design.

  • The compressive strength of the concrete or the percent and type of reinforcement are not according to the codes’ requirements.

  • The settlement in the foundation is more than the allowable.

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Construction stages:

  • Step- 1 :

  •  Before this technique is carried out, we need to reduce or even eliminate temporarily the loads applied to the column; this is done by the following steps:

  • Putting mechanical jacks between floors.

  • Putting additional props between floors.

  • Stage-2 :

    if corrosion in reinforcement found then,

  • Remove the concrete cover and expose rusted reinforcement.

  • Identify extent of corrosion of reinforcement and remove concrete 150mm beyond rusted length.

  • Remove plaster or coating,100mm beyond the edge of cut concrete.

  • Hack back ...

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