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college of Engineering and ArchitectureDepartment of Architecture & Interior Design

Summer 20ll Semester

MID-TERM l EXAMSolution KeY

ARCII208 Structure I

Date:

Time:

Venue:

Faculty:

July 16,2011

09:30 - 10:45 am

4-14

Dr. Haidar S. Almaroof

Notes:

1- Answer all Questions :

3:HlTJ,T#f#",tf:' FouR pases incruding cover pase

Q1-A)Choose the appropriate answer (20 MARKS)

1- When a particle is in equilibrium, the sum of forces acting on it equals to:

(c) Zero

2- Using right side direction as a positive, for the link below, the sum of forces in the x-direction (X F;) is:

(a) 600 cos 30o - 400 sin 50o

3- For the cantliever beam shown below, the

moment at the fixed end A is equal to:

(d) 33 kN.m

4- For determining the centroid of the area shown below, what are the coordinates (x,y)

of the centroid of rectangle ABCD with respect to x and y - axis?Y

(b) (100, 15) mm

Fr = il09*

6

F9# 'l

5- Using joint method to amlyze joint B, you find that Fs6: - 500 N. Member BC mustbe in:

(b) Compression

500 N+

Q1-B)

A simply supported beam (AB) of span 12 m is subjected to the uniformly distributed

load of 10 Krlm alomg 6 m span and non-uniformly distributed load of l2Y.lnlm along 6

m span as shown in Fig. Ql-B below. Determine the reactions atthe supports A and B.

(30 MARKS)

f,ao 'ry= 36 EN

O rYr

Figure Ql-B

Q2) For the cross sectional beam shown in Fig. Q2, calculate the location of the centroid

(2s-MARKS)

A, --

fr,,A, i,

with respect to x and r *:' Y6t\

:30* - 1so -- --*39..l

3c-*15't35o ttt' i-

Figure Q2

l5 ^* r!,-- 5Z'5 -o 2fr2

= tl25a

zAtLA

6 5'7

a.

tA51/)

t3 -5

G

v 35 ?50ttZ!o

fh(n

ttr,,n

AL 3 3e ^VSt52'5 ^ngr--l9m* r{z')'<

frrl,r,2o25'o , frrl' '7of?5

A3 -- 2lo * 3u'- I i oo tnt

f3= lo5 rntr '{3" I5 'Y1/t^'

o*t,bbtuifir'1'45oo

A 11 '- 75 t 3o'L>'o r,.'t

A.;

\ rt, , 5 nn'A '3'( t

A, f ,-2t31?5o / Av i'' i

t350tn n;r

Y, .t5 tg,l5t rZSe

ncnn t

5 'Ll , lt3-5)

i 2o25o , A?J, =1o81 5

,- g 137j ,,-,t

Q3)For the truss shown in Fig. Q3, compute the intemal force in members EF, ED,AF and

AE using joint method of analysis. Indicate whether the members are in tension or in

compresslon. (2s MARKS)

I..B.-r)

-

^ L-'F , c), l+)a

?F1 -- o

G

.4-FletSoP

CY '-o,4(r= Mnao

4=

{o" ( 4) - 1oo('/) Cr(il76

qFt -o

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Qg-. Il Jo N t

>6

Figure Q3

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t '- #=7t f-p a ,vtt s

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