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Quick-reference sheet of essential RCD formulas Includes formulas for beams, slabs, shear, columns, and footing Organized per topic for fast access during exams or practice Handy for board exam review and computations
Typology: Study notes
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RCD COLUMNS
MAIN LONGITUDINAL REINFORCING BARS
min. n0. of bas
SPIRALS
min. clear distance (sc)
CC =4omm
6 circular
min
môx
min
ciear cpacing , s (pitcn)
Smin
Do
Ag
4Omm
Pg
T D 2
Ac
<7 25 tpsp
Smn < (^5) t$SP
LATERAL TIES
min
S 48pT
;max
Circular Sc a
least coumn dimendon
Tied Column d -005)
mAGNITVDE DF USABLE COLUMN AXIAL LOAD ATRENGTH
circunpercnce -n pne
(pure aial capity )
NO.:
DATE:
e<o-05D
e <0.b
Pu o850.85f (Ag -Ar) t Arfy
1- 4.5 steel^ raio
n
()
AXAL
BolYnced Condition (fs fy)
Tension Contro)s
{FH =O
Pn - Cs - Co +T 0
BENING MONmENT
DESIGN
INTERACnoN DIAGRAM
Cact =
Aq
nominal axial capacity
Mu PUT
Pu
KLu
KLu
As
needed p e/h
3 ks
Columns braced Sgainst siderway
X
che ct Or^ bar^ aconodaon
2 22
r0.25D
ard
KLu
e> ebal
3 ksi
r "030h (perpen to bertg) rectangular
circular
(ingle)
fn (e^ )-^ cs^ (d-a)^
CURVATURE
bar aCUomodaton
X (^) n
NO.: DATE:
AZ (fr or y)
b - 2cc - 20T - n Ømp
n-
(dousle) w brace
Plastc Cenod
Cc =0-85f Aonc
A[ (fy-o-85 ) x(0-
R= CC + Cs