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Concrete Crack Analysis

 
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Jagadish J S
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Joined: 07 Jun 2018
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PostPosted: Thu Oct 15, 2020 9:42 am    Post subject: Concrete Crack Analysis Reply with quote

Dear All Safiance,

Any body please elaborate the concrete crack analysis and identification.

How to judge the crack whether it is structural or non structural in members.

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es_jayakumar
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PostPosted: Sat Oct 17, 2020 2:43 am    Post subject: Reply with quote

I hope, the attached Thesis work obtained from net may be useful to you.

E S Jayakumar



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A study on Cracks.pdf
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pvgraju
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PostPosted: Thu Oct 22, 2020 7:20 am    Post subject: CRACKS IN CONCRETE Reply with quote

Generally cracks in concrete in compression zone can be considered as structural.Because it will damage structural strength of concrete such as cracks due to shear flexure etc. Other cracks which occur in the tensile zone of concrete can be considered as non structural.Because its effect is of minor influence on member.
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Dr. N. Subramanian
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PostPosted: Wed Oct 28, 2020 9:20 pm    Post subject: Re: CRACKS IN CONCRETE Reply with quote

Dear Mr. Raju


From where you got this idea? Structural and non-structural cracks are defined with respect to whether they will affect the performance of the structure and definitely not defined with reference to compression zone or tension zone. Concrete is weak in tension and hence reinforcement is provided to resist tension. Crack in the tension zone is dangerous as it will give rise to ingress of water and other chemicals to the reinforcement,  which will result in corrosion leading to failure of the structure.

Best wishes
NS
pvgraju wrote:
Generally cracks in concrete in compression zone can be considered as structural.Because it will damage structural strength of concrete such as cracks due to shear flexure etc. Other cracks which occur in the tensile zone of concrete can be considered as non structural.Because its effect is of minor influence on member.
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vikram.jeet
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PostPosted: Sun Mar 28, 2021 8:09 am    Post subject: Reply with quote

Cracks in con rcc beam
(¡) diagonal cracks towards supports on beam side faces- Deficient shear reinforcements
(Ii) horizontal cracks along beam bottom face (parallel to beam width)mostly  at center portion -Deficient tension reinforcements at bottom face
(Iii)- - - do- - - at top face mostly near supports -  Deficient top reinforcements at supports
{B} Column Foundation settlement cracks - will appear as diagonal cracks in brick walls, cracks from top corner of wall towards center along diagonal
(Iv)Plinth beam settlement cracks - cracks appear in walls in diagonal starting from top center towards bottom corner
(C) Cracks in brick walls -
(I) due to foundation settlement - as discussed above
(ii) cracks sometime appear along electrical conduit s
(iii) cracks appear if building length is more between expansion joints or TL shaped buildings w/o exp gap.
(Iv) cracks in sunshades & Boundary walls - exp joint length excessive
(D) Slabs - diagonal cracks near two slab corners - inadequate torsion reinforcements at corners
Cracks perpendicular to span - insufficient bottom reinforcements.
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