Solution to Assignment 3 - Checking Scaffold Falsework 

(a) Calculation of Wind Moment

Vd 25 m/s
:=(d/40.4) = (%0/40.4)= 0.383 kPa
A(scafold)=n*Overall Area = 0.04*(1.5*7.5)*8 3.600 m
A(toeboard) = 0. *1.5 0.300 m
$(scaffold)=f *:*A = 1.%*0.551*%.; 1.7! k" #er ro$
$(toe board)=*f *:*A = .0*0.551*0.%00 0.%0 k" #er ro$

Wind Moment = wh =!"#$%&"#'! "33%(&"#"!'!) $"*+& k,-m er row

(.) Ma/ 0eg 0oad

Total Loading Intensity = 6.0 ka!".5 # $ k%&#
 Calculation of 0eg 0oad &otal
'dl= $ k"/m
k"/m &otal
otal ert
ertca
call oa
oad
d =!*!
=!*!.1
.1 = 8".$ k"
+oment= 8.'6 k",m
+ember A -     2 3
l (m) '.55 3.25 ".$5 0.65 0.65 ".$5 3.25 '.55
l (m) 20.03 "0.563 3.803 0.'23 0.'23 3.803 "0.563 20.03 0.$8
 # 0.2$2 0."'$ 0.05' 0.0" 0.0" 0.05 0."'$ 0.2$2 ".000
nd'ced ert. oad  (k") 0.5' 0.3$ 0.23 0.08 0.08 0.23 0.3$ 0.5'
ertcal d'e to 'dl   (k") 5.85 "".0 "".0 "".0 "".0 "".0 "".0 5.85 8".$00 k"
1ot a
all leg loa d ( k,
k,) # "3
"3 % %% "3
"3 % %%"* & %%"+ ! %%"& $ %% "2
"2 3 %! "
"2 +"32

Ma/ 0eg 0oad "2.0$ k"

0ift height 1.5 m
0eg 0oading Caacit:
(Assume >S?7 conidtion) *& k, 45 from 1a.le %
,one of Verticals are negati6e o r under tension

(c) Calculation of 7iagonal 8races

&otal nd oad =.581  0.%%1= 2.022 k"

o'#ler a#act6 6.25 k"
Anle of aonal nclnaton  =tan,1(1.5/1.%) = 4%.88 derees
&9e re
ref or
or e n os
os. o f da on
onal r e:
e:' r
red =  .!
.!11/ (; .
.5 * co s 4 %.
%.8 8 d e
er ee
ees )
 = 0.'5
9ro6ide 4ne(%) ,o" of 7iagonal
7iagonal 8race er row

+ne ,iagonal Bra-e or ea-h ro/ o *-aold /ith s/iel -o1lers ied at ea-h leel
or ea-h ro/ o s-aold str1-t1re (+r alternatiely4 t/o or eery se-ond ro/)

(d) Calculate the Factor of Safet: 6s 46erturning

O/& +oment = .581*7.5/ *in-e there are t/o edge :oards

*0.%%1
*0.%%1*(7.50./)
*(7.50./) = "0.2"3 k,-m er row eosed to lateral /ind
,L d1e to ,ead Load or an e#ty /orkin#g latdor# = " ka !".5 # = ".5 k%&#

>/< +oment = 1.5*(!.1) *

(!.1)/ 62."08 k",m (7 :ays ea-h ".3 # /ide)

Factor of Safet: 6s 46erturning  = ;.108/14.70; = ; %"! 45  

,o 5entledge is re<uired

(e) Soil 8earing 9ressure

-ase Plate to <caffold e 0."5# Sole 9late 1hickness

<ole Plate &9ckness 0.05 # # mm

<ole Plate $dt9 (Ass'me
150150 base) 0.3 #
<ole Plate oaded ent9 (load
s#readn at 1 on ) = **0.50
 0.15 = 0.35 #
-ase Area = 0.% m  0.%5 m 0."05 m

Soil 8earing 9ressure =

%!"!+'"%# k9a

Assessment 9lan

Co##1ni-ation4 IT and %1#era-y

1 --1ra-y o Cal-1lations 9 *ket-hing 5.0

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;esonsi:ility 9 1tono#y Che-k oints4 <1ote B* 7aterials.. Code o

P ra-ti-e.et-. 2.5
Total Load (Per leg)

Dead Load + Live Load + Transferred Load = Total Load

Dead Load

This load does not include the weight of workers, extra materials, or other similar va

Dead load is calculated using the following formula:

Sum1 + Sum2 = Dead Load

Sum
This is-1the weight of all the components directl$ on each leg that has a screwack.

This includes materials such as vercal posts (standards). screwacks, headers (if app

Sum-2
This is !"# of the weight all components on the ba$s a%ached to the selected leg&s b

Live Load
ive oad is the addional load on the leg when the scaold is in use.

This includes workers, work materials, etc but does not include the scaold material
ive load is calculated using the following formula:

*sable Deck +rea x *nit ive oad  ive oad

Usable Dec !rea

Unit Live Load

This is *nit ive oad as de-ned b$ the user in the eg oad Table dialog.

Transferred oad

Transferred oad is the addional load on the leg for adacent suspended legs"ba$. 
  riables.

licable), supported ladder runs, etc.

a$ such as planks, hori'ontals, braces, etc.

s

uspended legs are legs without screwacks. oad will be transferred for up to ! and !"/ ba$s.