Selected symbols

Symbol Definition Value Symbol Definition Value

Ac Cross sectional area of concrete

¿s

Area of tension steel

Area of compression steei

^s, prov

Area of tension steei provided

^s, req'd

Area of tension steei required

be ff

Effective flange width

bt

Mean width of the tension zone

^min

Width of beam or rib

Width of section, or width of web on flanged beams

d

Effective depth

dz

Effective depth to compression reinforcement

fed

Design value of concrete compressive strength

«cc /ck/7cfor/ck<C50/60

Zck

Characteristic cylinder strength of concrete

Zctm

Mean value of axial tensile strength

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

hi

Flange thickness

K

Factor to take account of the different structural systems

See table NA.4 in UK National Annex

/eff Effective span of member See Section 5.3.2.2 (1)

/eff Effective span of member See Section 5.3.2.2 (1)

/0 Distance between points of zero moment

l/d

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

« 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

G m

Partial factor for material properties

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

R 0

Reference reinforcement ratio

R /ck/iooo

R

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

As/bd (for rectangular beams)

R '

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

AsZ/bd

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