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