ll*;' lr *l \ -{ t, "r" '' c q I ^l | ,, I (9 ] ','t T- "*':lo \ c l,D 'u- lD /.-r @ , ,o.6 r Irti\7 . ,,,' ^ (, f( rlR-"1 | @ f r !'o .l' ,,'+ q I t', ,.." i q* d ::::::::: i' j"*ra r:r:- .9 L ,?,,t." ' f' ,r' -l*-2 r','-l t-*' a.], j 9ll -r Pr-ob. 6.2 Prob. 6.4 prob. 6.fl ll + taJ !1e.11g, :* A- Method of ioints: Problem 6.2 &6.4 & 6.8 Using the method of .joints. cleter-nine the force in each menrber of the truss shown State whether each member is in tension or compr-ession. A: An+CJ:o Ax=-c, A1 - 5,6 : o At= S.( rcijs C:* tq -f .S{ b,6 =c). Ql =J,r.ifs -: Ax=-jnips ?gb e ,1 ? ?Fx =o =FJ =t'' tl-10- o -i o,-{ -rJor,t t3 -= b,6rri?. €F3=o SlCoSo t SZ colo =o H\ *o,cSz =-() _>qo -5.( - SzSrtna + Sr Sin S :L,. frar= 6.6+g.Gs2. u(b /5, = 3.q l4"ip s (-.. rion) (Utt " /=r=-5 tti? s Ccr* pr?sgsie 1 (s' f.5
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i q* d ::::::::: i' j"*ra r:r:- .9L ,?,,t." ' f' ,r' -l*-2 r','-l t-*'
a.], j9ll
-rPr-ob. 6.2 Prob. 6.4 prob. 6.fl
ll + taJ !1e.11g, :*
A- Method of ioints:Problem 6.2 &6.4 & 6.8Using the method of .joints. cleter-nine the force in each menrber of the truss shownState whether each member is in tension or compr-ession.
A:
An+CJ:o Ax=-c,A1 - 5,6 : o At= S.( rcijs
C:* tq -f .S{ b,6 =c).Ql =J,r.ifs -: Ax=-jnips
?gb e ,1
? ?Fx =o
=FJ =t''
tl-10- o
-i o,-{ -rJor,t t3
-= b,6rri?.
€F3=o
SlCoSo t SZ colo =o
H\ *o,cSz =-() _>qo
-5.( - SzSrtna + Sr Sin S :L,.
frar= 6.6+g.Gs2. u(b
/5, = 3.q l4"ip s (-.. rion)
(Utt " /=r=-5
tti? s Ccr* pr?sgsie 1
(s'
f.5
A+ Torn! C
?-b G,tl
--- L(3 =o33 LSz(inrl-=a
Fe = -SzSfncr = - */'
(uc
oo0 2 Fx:o By + l,X :o R{= _l,g *Mt {:j -r} Be + c1 = ?,A (N?l-lG=o (g*\,S,*,?,( itj,C t \,.AtL=o
-5r q
3= 4 niPs. Te"$rcrn
Al doin+ o
q+ Tcr,rn+ c
St
s{ *-t3 r,
L.LrwN
C^J= 2.36 r,rr..u
-: lFx =o
a(-j =o A2 \v ot = 2-,lo
\z 2 =2.\?-5
-'l - ---St = 3.4? -T eu \rin'C XOr - ':==::::':-\ ' ,.2\t = - j. \t x 2t ::Z,Sz urw.(
1 \P' T5V - - Comtvc \l r.,^
., !b"/
,Sq =. S\ : 7,5L .t( N c.owe..w$,fr,or^
la = -% ; - l.!6 ,nnr Cow,?ws!r-,v,/
i
1vu
A{ Jo,r,rt A
t.8wN €r.u oi'f\s,
S3
-t 2Fx= o
i rol.l\g$n C ,,5
1,5
?,(ft.1r Zt -t,X = a * o, 6-1e
(6 : \.a h rJ Tgn!1oyl
(ug
Ex -l-t-\=" -f*=c(r(i1sEr + Fy =()
--, -A* 6.15+ _qX t3.S t 6s*3=uF3= 9 tu?r
* Ei=-3Ki?s.
o
?llrl'o /
i Sz\rrn b - Sa Sin
-: f.Ft=o E1 = S 2
tf9;"o €y=-S1
KI
o'C
:1.8
08 ZFN. =o
tfj :u-i lte =o
dovn* E
Sr
tf"*-b---+, 5 zEx -fgn srov\
Tgn h1'*
at d",tn+ fjt.s=
.-='J t t'52
tt.LS ,/1
-.€a--l t'=t
ef+
. <(-- ar-X sO
Sq Cots { 52 =<-:
Sv1 -- - .&* l\.tt3 = -\o Kif \
CawrPYtr' 55*;
trg+ S:+ S\tr-* =c)s3= -3 (-ro1 C,arl
- tfg=e
o+ lonn[ c(s
,lr- | ?tttr' ofr*> Ss
J\s,n5r
t7y. u
2(3 =u
S5+Sncoi* +q :o55 -- -t,+ tr:*9, =
S( = SnSus + Sr
S6
\ vtipt -TeinS;6y,
3 = 3 w\ps-1-(n Siun
A+ -&inl G
S\",Cr-
Sg
7*tN o €(t<vx^_\ t*rA AU
*- 2 R =_e-'
L€,7 = c,
s4 =t'Sg = c-r
L+ lotnl
Sg EF 1=t Sr,
\].Lf = - 5 Wif t Covntr.tiSr.r.5
{x
D
\t**?uS:
:g co ss
St=
Problem 6.10Determine the force in each member of the Howe roof truss shown. State whethereach member is in tension or comoression.
.-- /le)(9D I
i
r 4H'rt-
- H{.
!orn{ S, yro (XtvyoJ ?ov&
et^J b1 Z_svo rvr.e,$^btv
lunl Go.tso rk*ber
o C* ' t^rg hoAJ s jwL**d\"krr
v\^tl ,vrs./v, b( " tf3 i s Z€.o.r /yu,,tr^ b( r
GF i! T*-*-* rr(t. .: F.B: [c.t
T*? in
rf\
o{){., 1,fu=o
?rv -:o
=HA. o
H1=o.
ArtHj =
fl9 + i2
R1 : tt
(r ?+
6+
KM
3ta = ?t{
t4 -64.A,j=
rt r.J
16 - ({
1? hN,
*: o-[ Toi,,r4 A
&',4t"Y8,t3
(-:*j2-cr
-:. sr
r-'-Sr
- Se corcu
\t W^l T€rnSrbr"
SzzSr ', t6x=<, St+ SzC-oEe.=L'
?f9=c, SZSrnu:3-AA
fna r Sz = F \S tv 'fonn3ns\ran
Fa.
ft+ troinf c_
sr *-=3
Al- fofn4 H
s<
\T3a-el5
sru ? !1,
A+ Tor n-l G
S e a--e-------+ Sy,
At -6or nt F
3 0-' vtN CoWWY S J ir,"'-'Sg= Sq
/
:- Sq,/'
(tt'
Sin
s5
(.s
€F*=o Sro + Sr
a Fp 3 SoIrne*
(oo y'tt r
,u*j'" =
CO6O=Q
1 - 3 -\-\=
-\S Kt/'
- Ss ccfd =
C,oVn,Qr''Htf r^". "
t?- t,r-M T(n Ston
* s't
"hSe "/"f*\II
C
- \ o, t11ut
_ 5KN1-\( :(*
= Sto = tlnt/
a[x=o Sg Sunu Sq o( - SnCoJd =\; -
.1 ro,ASe + 5"{ oA -154 of
€rr =o S5 CoSor + SqCosu *G - S,4 S&re=c
'.S6*o.C - S,,\{o.C = lS*o.(-<
C,o*tvt; Sf ls"-
C,crrT\(SSl"D.
(st
A+ Toiaf 6
=!o " tt .n\- | -,-
s*-*Je----->LF1 =(l
7-€3=o
Tlre\2
5s
Sb
n| 7-oint _o
5cnu
Sz 191=o -
.- sn s.y(
iS'S.{{/
Fqo (Ya(
-- Sg - St + E, coio - Slrdsss = o
Sr C,of.r = tL :-- lL - a+o'?
- -...-Sr, -- -5 K nJ covnevtssfo,^.
kqL
'- S1 + S\r <in g + Se sf n\d =t''-
51 = - Srr lt Sr*o, - 5t {'.^"*
51 = - 5Xo.(r gsvru'6
)r= CnN. TcnSion-y'Lo€
s3 Si/o(
= - \o VtV CoYv\Q re SSWVr
B- Determination of zero members:Problem 6.29For the given loading, determine the zero-force members in the truss shown
{)B5n5
. 2-fr:l q o
. il :..i',
t'; ,1'oo{IT T,o/.. t a*t?fttfia
-\, I ' Z \2-oo ?oT e()L' 7I ..:,-,.r -
t\ rtl ..:..;...:.,:.::.:....
o% fr* 'J-ur,ats g.:ifrn nq t(tq"i*{ ?"f, qr^d
OhAru$ro1 Z vwanr4{.lev \ not un Sorr"Sg
(,-. '\-/ vtAilrrs 3 t)
tv^; ;'*"sr i t ?*.-* rvw,tdn b(;
-Z!,ro tn4arvr[oqvf on'e, k O BCbtoG-' Nrt
*D r-(Lo rdQ TL.
I
[*^. ? yn&v.rbqirf ANv 4nnh*b(,tryrVx
Dvta I ovr-< |,,t W r-tru pt* q_2tn t0.rr,4{ fu'-
Problem 6.34For the given loading, determine the zero-force members in the truss shown.