Selected symbols

Symbol Definition

Value

Symbol Definition

Value

¿c

Cross sectional area of concrete

bh

¿s

Area of tension steel

¿s2

Area of compression steel

¿s, prov

Area of tension steel provided

¿s, req'd

Area of tension steel required

b

Width of slab

d

Effective depth

d2

Effective depth to compression reinforcement

fcd

Design value of concrete compressive strength

Acc /ck/Yc

fck

Characteristic cylinder strength of concrete

fctm

Mean value of axial tensile strength

0.30 /ck2/3 for /ck < C50/60 (from Table 3.1, Eurocode 2)

lh

Slab thickness

K

Factor to take account of the different structural systems

See Table N 7.4 in UK National Annex

l eff

Effective span of member

See Section 5.3.2.2 (1)

lid

Limiting span-to-depth ratio

M

Design moment at the ULS

X

Depth to neutral axis

(d - z)/0.4

xmax

Limiting value for depth to neutral axis

(D - 0.4)d where D <1.0

z

Lever arm

a cc

Coefficient taking account of long term effects on compressive strength and of unfavourable effects resulting from the way load is applied

0.85 for flexure and axial loads.

1.0 for other phenomena (From UK National Annex)

d

Ratio of the redistributed moment to the elastic bending moment

Gm

Partial factor for material properties

1.15 for reinforcement (ys) 1.5 for concrete (yc)

R0

Reference reinforcement ratio

R/ck/1000

r

Required tension reinforcement at mid-span to resist the moment due to the design loads (or at support for cantilevers)

As/bd

r'

Required compression reinforcement at mid-span to resist the moment due to the design loads (or at support for cantilevers)

AsZ/bd

Greener Homes for You

Greener Homes for You

Get All The Support And Guidance You Need To Be A Success At Living Green. This Book Is One Of The Most Valuable Resources In The World When It Comes To Great Tips on Buying, Designing and Building an Eco-friendly Home.

Get My Free Ebook


Post a comment