Crack Width (Flexure_ BS8110-2) by RG
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Transcript of Crack Width (Flexure_ BS8110-2) by RG
raymund
DOCUMENT No. SHEET
XXXXXXXXXX 1 OF 2SUBJECT
FLEXURAL CRACK WIDTH COMPUTATIONS
REFERENCE CALCULATIONS OUTPUT
SLAB MARK: xxxxxxxxLocation: xxxxxxx
Reference Code: BS 8110-Part 2
Material Properties:
Characteristic Strength of Concrete = 60 N/mm²Characteristic Strength of Steel = 460 N/mm²
Unit weight of concrete = 25 kN/m³Elastic Modulus of steel = 200 kN/mm²
Short-term concrete modulus = 32 kN/mm²Long-term concrete = 16 kN/mm²
Allowable crack width = 0.20 mm
Element Thickness = 1500 mmSize of reinforcement = 32 mm
Reinforcement spacing = 100 mmNumber of Layer/s = 1 layer/s
Transverse bar or vert. bar spacing = 32 mmConcrete cover = 75 mm or vert. clear spacing
Element width = 1000 mmEffective depth = 1409 m²
As provided = 8042 mm²= 12.5
Service Moment = 4527 kN.m
Location of the Neutral Axis (x)
= 442 mm
Stress in Steel (fs)= 446.1 mm
Distance from the compression face to the point atat which the crack width is being calculated)
a' = 1500 mm
at a depth of ### = 0.0024
BS 8110-2 Average Strain at the level where cracking is considered3.8.2/3.8.3eq 13 = ###
3.8.2 Distance from the point considered to the surface of the nearestlongitudinal bar (acr):
= 87.83 mm
Design surface crack width:
= 0.566 mm [NOT OK!]
[ warning: the design crack width exceeds the maximum limit! ]
Modular ratio = Es/Ec
Strain at level considered, (ε1)
raymund
DOCUMENT No. SHEET
XXXXXXXXXX 1 OF 2SUBJECT
FLEXURAL CRACK WIDTH COMPUTATIONS
REFERENCE CALCULATIONS OUTPUT