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Larsen & Toubro Limited: ECC Division - EDRC

This document provides calculations to check the crack width for a footing (F17) under maximum moment (M) of 1389 kN-m for the Delhi International Airport Terminal 3 project. It calculates the crack width (Wcr) of 0.08 mm, which is less than the permissible limit of 0.20 mm. Therefore, the crack width is within the acceptable limit as per IS:456-35.3.2.

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508 views2 pages

Larsen & Toubro Limited: ECC Division - EDRC

This document provides calculations to check the crack width for a footing (F17) under maximum moment (M) of 1389 kN-m for the Delhi International Airport Terminal 3 project. It calculates the crack width (Wcr) of 0.08 mm, which is less than the permissible limit of 0.20 mm. Therefore, the crack width is within the acceptable limit as per IS:456-35.3.2.

Uploaded by

selva
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
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LARSEN & TOUBRO LIMITED

ECC Division - EDRC

PROJECT:
DELHI INTERNATIONAL AIRPORT LIMITED - TERMINAL - 3 AIRSIDE DOCUMENT NO. DATE
& LANDSIDE WORKS 8/12/2017
DESIGNED CHECKED SHEET
TITLE: FOOTING F17-CRACK WIDTH CHECK FOR MAX MOMENT
RDN MVH

CHECK FOR CRACK WIDTH (As per IS 456 : 2000 ANNEX F):

GRADE OF CONCRETE fck = 40 N/mm2

MOMENT AT THE SECTION CONSIDERED M = 1389 kN-m

OVERALL DEPTH OF THE SECTION h = 2000 mm


THE WIDTH OF THE SECTION AT THE CENTROID OF
THE TENSION STEEL b = 1000 mm

MINIMUM COVER TO THE LONGITUDINAL BAR Cmin = 75 mm

DIA OF BAR = 25 mm

EFFECTIVE DEPTH d = 1912.5 mm

COVER TO THE COMPRESSION STEEL d' = 75 mm

DISTANCE FROM THE POINT CONSIDERED TO THE acr


SURFACE OF THE NEAREST LONGITUDINAL BAR = 85.13 mm

AREA OF TENSION STEEL As = 3926.9908 mm2

AREA OF COMPRESSION STEEL Asc = 0 mm2


DISTANCE FROM THE COMPRESSION FACE TO THE
POINT AT WHICH THE CRACK WIDTH IS BEING a = 2000 mm
CALCULATED

MODULUS OF ELASTICITY OF STEEL Es = 2.00E+05 N/mm2

MODULUS OF ELASTICITY OF CONCRETE EC = 31623 N/mm2


LONG TERM MODULUS OF ELASTICITY OF Ece
CONCRETE = 15058 N/mm2

MODULAR RATIO m = Es/Ece 13.3

DEPTH OF NEUTRAL AXIS x = 397.5 mm

CRACKED MOMENT OF INERTIA Icr = bx3/3+mAt(d-x)2 1.41E+11

SERVICE STRESS IN TENSION REINFORCEMENT fs = mM(d-x)/Icr 199 N/mm2

STRAIN AT THE LEVEL CONSIDERED, e1 = ((h-x)/(d-x))fs/Es 0.00105

em = e1- b(h-x)(a-x) 0.00033


3EsAs(d-x)

DESIGN SURFACE CRACK WIDTH 3acrem


Wcr= 0.08 mm
1 + 2(acr-Cmin)/(h-x)
PERMISSIBLE CRACK WIDTH (IS:456-35.3.2 Page-67) = 0.20 mm OK

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