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RCD Formulas – Reinforced Concrete Design Formula Sheet, Study notes of Reinforced Concrete Design

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

2023/2024

Available from 06/06/2025

imwinter
imwinter 🇵🇭

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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
4
rectangular
3
thangular
ciear
cpacing
, s
(pitcn)
Smin
Do
cpacing
Ag
PSrin
=
0.45
4Omm
max
lommp
-
(25mn
or
dogg
) + p
Pg
T D 2
Ac
redesign
<7
25
tpsp
+ Brp
pirals
4Asp
(e-
bp)
Smn
< 5
t$SP
AXIALLY
LOADED
LATERAL
TIES
min
max
spacing
(CTC
)
S 48pT
;max
Rectargular
/squart
SCoa
Circular
Sc
a
VvICTORY
least
coumn
dimendon
Di
d-
2
cc
-
2psp
-
pme
Tied
Column
d -005)
mAGNITVDE
DF
USABLE
COLUMN
AXIAL
LOAD
ATRENGTH
circunpercnce
-n
pne
fo
o
85f
(Ag
-As)
+
Asfy
(pure
aial
capity
)
NO.:
Pu
o-808
|0-85f
(Ag-A)
+
Afy
Spiral
Col
urn
(=045)
DATE:
e<o-05D
e
<0.b
<
0.1h
(perpendicular)
circular
but
tied
pacing
Pu
o 850.85f
(Ag
-Ar)
t
Arfy
1-
4.5
steel
raio
n1
()
pf3
pf4

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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

4 rectangular

3 thangular

ciear cpacing , s (pitcn)

Smin

Do

cpacing

Ag

PSrin = 0.

4Omm

max lommp

  • (25mn or dogg ) + p

Pg

T D 2

Ac

redesign

<7 25 tpsp

  • Brp

pirals

4Asp (e- bp)

Smn < (^5) t$SP

AXIALLY LOADED

LATERAL TIES

min

max spacing (CTC )

S 48pT

;max

Rectargular /squart SCoa

Circular Sc a

least coumn dimendon

Di d- 2 cc - 2psp - pme

Tied Column d -005)

mAGNITVDE DF USABLE COLUMN AXIAL LOAD ATRENGTH

circunpercnce -n pne

fo o85f (Ag -As) + Asfy

(pure aial capity )

NO.:

Pu o-808 |0-85f (Ag-A) + Afy

Spiral Col urn (=045)

DATE:

e<o-05D

e <0.b

<0.1h (perpendicular)

circular but tied pacing

Pu o850.85f (Ag -Ar) t Arfy

1- 4.5 steel^ raio

n

()

AXAL

BolYnced Condition (fs fy)

(ompresion Controls

Tension Contro)s

{FH =O

Pn - Cs - Co +T 0

BENING MONmENT

DESIGN

INTERACnoN DIAGRAM

Cact =

Aq

nominal axial capacity

Mu PUT

Pu

plot to ge fg

As 9Ag

KLu

KLu

As

intcpolatt iF

needed p e/h

SLENDER /LONG cOLUMNS

3 ks

Columns braced Sgainst siderway

X

che ct Or^ bar^ aconodaon

2 22

r0.25D

A

ard

Colu mns not braced gainst nderway

KLu

e> ebal

3 ksi

r "030h (perpen to bertg) rectangular

circular

Asfs

Ag

Afy

(ingle)

fn (e^ )-^ cs^ (d-a)^

Cc (d-)^ o

CURVATURE

bar aCUomodaton

X (^) n

NO.: DATE:

AS (f or fy)

eccenticy; if actual gNern, get ebal pIrt

AZ (fr or y)

MAGNIAED MOmENT ( Mc)

b - 2cc - 20T - n Ømp

n-

B065 (chort tied)

075 ( spical)

(dousle) w brace

Plastc Cenod

Cc =0-85f Aonc

YIo-

A[ (fy-o-85 ) x(0-

R= CC + Cs