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Crack Width Calculations

This design report summarizes the calculations for crack width verification of the piles and piers of a substructure foundation. It provides material properties, geometric data, stress checks, and crack width calculations showing that the expected crack widths of 0.38mm and 0.37mm for the pile and pier, respectively, exceed the allowable crack width of 0.20mm. Therefore, the crack width is not within the acceptable limits based on this analysis.

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674 views1 page

Crack Width Calculations

This design report summarizes the calculations for crack width verification of the piles and piers of a substructure foundation. It provides material properties, geometric data, stress checks, and crack width calculations showing that the expected crack widths of 0.38mm and 0.37mm for the pile and pier, respectively, exceed the allowable crack width of 0.20mm. Therefore, the crack width is not within the acceptable limits based on this analysis.

Uploaded by

dfdggg
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
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Download as PDF, TXT or read online on Scribd
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Design Report of Substructure and Foundation

Annex-Crack Width
SUPLEMENTARY CALCULATIONS

th.1 CRACK WIDTH VERIFICATION


Pile Pier
Sr. No. LOAD DATA
SLS-Nor SLS-Nor
1 TOTAL MOMENT KN-M 1018.62 717.75
2 Moment Due to Dead Load KN-M 394.02 277.63
3 Moment Due to Live Load KN-M 624.61 440.11

MATERIAL DATA
4 Grade of Steel Fe 500 Fe 500
5 Characteristic strength of reinf. (fyk) Mpa 500.00 500.00
6 Partial factor for steel (Уs) 1.15 1.15
7 Design value for tensile strength (fyd = fyk/Уs) Mpa 434.78 434.78
8 Modulus of Elasticity of Steel (Es) Gpa 200.00 200.00
9 Grade of Concrete M35 M35
10 Charecterstic comp. strength (fck) Mpa 35.00 35.00
11 α 0.67 0.67
12 Concrete material factor (Уm) 1.50 1.50
Design value for Concrete comp. strength (fcd =
13 Mpa 15.63 15.63
αfck/Уm)
14 Modulus of Elasticity of Concrete (Ecm) GPa 29.58 29.58

GEOMETRIC DATA
15 Width of Section(b) mm 1000.00 1000.00
16 Total depth of Section mm 1200.00 1200.00
17 Clear Cover mm 75.00 75.00
18 Dia of reinforcement mm 25.00 25.00
19 Area of reinforcement mm² 6135.92 3926.99

20 Dia of Shear Reinforcement mm 16.00 16.00


21 Effective depth of section (d = D-c-φ/2) mm 1096.50 1096.50

STRESS CHECK

22 Postion of NA axis from compression flange (x) mm 415.95 237.34


23 Stress in tension reinforcement σsc MPa 250.00 250.00

CRACK CHECK

24 acr mm 91.42 91.42


25 ϵ1 0.00145 0.00141
26 ϵ2 0.0013 0.0013
27 ϵm (EQ. 25 of IRS cbc) 0.00145 0.00141
28 Design Crack Width Wcr (EQ. 24 of IRS cbc) mm 0.3817 0.37
29 Allowable crack width mm 0.20 0.20
30 Status NOT O.K. NOT O.K.

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