Question

SAN4701 OCT/NOV 2013 QUESTION 3 (30 marks) Determine the member forces and vertical deflection at node C in the truss shown in Figure 3. Material property is constant throughout the members i.e EA -50 x 10° KN. 2 8 kN 3 m 4 4 m

Answer 1

3mm 니 The abovennextennally dekamin Remove AC as γedun dan Member ラ81cN 3n RA

aec calcul ahbn oy member torc due to tonal RY loc bad ar Joint- fec 36 . 86 下 Cox 3L.BC Sin 36 860 FAGF enoon

at JointA AB个 FAo HA to unit looed caucuwlation o nemle orce de Glong redundant nembs at jpintC- 36 8 kse 36s 1. co ㄅ A D 7cy 5レ co = 1 sin 36.86 ec (Comp)

아 joint B , kesc 93. 86 -AS 瓜 kg。 2H 는。 8-36 16 s Cos 36 80AO EAo AO C 36.860

as(-)ve Comprumon as, (positive) tennon -ta ke ) use Imo uo -final Sorce AE 乏k2L Force 8 Final 九ember 1o o8 3.5 6 A8 AD 1 A C 25G 2. B c -0.8 | -50 S 60 CD -o.63 16.1S

To find Verhcel deflection apply umit load qtc in verドces dir chim due and findow forces din e o ad 几 at join C :

veyticd defle ction AE =-0.149 mm ーveindecates Upward delle Chan