Scaffold Calculation

Solution to Assignment 3 - Checking Scaffold Falsework  (a) Calculation of Wind Moment 25

Vd

m/s

:=(d/40.4) = (%0/40.4)=

0.383

A(scafold)=n*Overall Area = 0.04*(1.5*7.5)*8

3.600

m

A(toeboard) = 0. *1.5 $(scaffold)=f *:*A = 1.%*0.551*%.;

0.300

m

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

kPa

(.) Ma/ 0eg 0oad Total Loading Intensity = 6.0 ka!".5 #

$ k%&#

&otal 8".$ k"

 Calculation of 0eg 0oad

'dl=

k"/m $ k"/m

&otal otal ert ertca call oa oad d =!*! =!*!.1 .1 =

8.'6 k",m

+oment= +ember l (m)

A

-









2

3

'.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

1ot a all leg loa d ( k, k,)

# "3 "3 %

%% "3 "3 %

%%"* &

%%"+ !

%%"& $

%% "2 "2 3

%! " "2

+"32

8".$00 k"

"2.0$ k"

Ma/ 0eg 0oad 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 2.022 k"

&otal nd oad =.581  0.%%1= o'#ler a#act6

6.25 k"

 =tan,1(1.5/1.%) =

Anle of aonal nclnaton &9e re ref or or e n os os. o f da on onal r e: e:' r red =

4%.88 derees

 .! .!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/ *0.%%1 *0.%%1*(7.50./) *(7.50./) =

"0.2"3 k,-m er row

*in-e there are t/o edge :oards eosed to lateral /ind

,L d1e to ,ead Load or an e#ty /orkin#g latdor# = " ka !".5 # =

>/< +oment = 1.5*(!.1) * (!.1)/

62."08 k",m

".5 k%&#

(7 :ays ea-h ".3 # /ide)

 = ;.108/14.70; =

Factor of Safet: 6s 46erturning

; %"!

45  

,o 5entledge is re