BS 5975 2019 Extract - Flipbook - Page 20
BS 5975:2019
BRITISH STANDARD
Symbol
Meaning
Unit
n1
Length obtained by dispersion at 45°, from extreme of stiff bearing
mm
n2
Length obtained by dispersion at 30°, from extreme of stiff bearing
mm
NH
Notional internal force
N
Ç
through the flange plates
Mathematical function
non-dimensional
p
Maximum pressure in pipeline
N/mm2
p
Force
N
p1
Clapotis pressure
kN/m2
pa
Active soil pressure
N/m2
pB
Concrete force
N
pb
Allowable bearing stress
N/mm2
pbc
Permissible bending stress in compression members
N/mm2
pbc
Permissible compressive stress due to bending
N/mm2
pbt
Permissible bending stress in tension members
N/mm2
pc
Permissible axial compressive stress
N/mm2
Pc
Safe load in compression for a column
N/mm2
pc
Max. water pressure at level C
kN/mm2
pc
Permissible axial stress for struts
N/mm2
pcw
Permissible compressive stress in the web
N/mm2
p-&
P-delta, 2nd order effect
Ph
Concrete force
N
PL
Concrete force
N
pp
Passive soil resistance (or pressure)
N/m2
PR
Concrete force
N
pt
Permissible axial tensile stress
N/mm2
Pv
Concrete force
N
q
Max. dynamic wind pressure
N/m2
Q5
Total force on the falsework
N
Q5,limit
Upper limit of force
N
qb
Allowable bearing pressure
kN/m2
qs
Dynamic pressure
N/m2
qw
Dynamic pressure of flowing water
N/m2
R
Reaction
N
r
Radius of gyration
mm
Rc
Reaction to horizontal concrete force FC
N
RCx, Cy
Orthogonal components RC
N
rg
Radius of gyration
mm
RH
Reaction to horizontal disturbing force FH
N
S
Wind factor
non-dimensional
S
Plastic modulus
cm3
Sa
Altitude factor
non-dimensional
Sb
Terrain and building factor
non-dimensional
Sd
Direction factor
non-dimensional
Sp
Probability factor
non-dimensional
Ss
Seasonal factor
non-dimensional
T
Mean thickness of flange
mm
12#© THE BRITISH STANDARDS INSTITUTION 2019 3 ALL RIGHTS RESERVED
