of 17

• date post

26-Aug-2018
• Category

## Documents

• view

212

0

Embed Size (px)

### Transcript of ENG. SAID ALHADDAD - site. 3).pdf · Case1: If only two non-collinear members form a truss joint...

• (a)(b)

(c) (d)

• (e) (f)

• Case1: If only two non-collinearmembers form a truss joint and noexternal load or support reaction isapplied to the joint, the members mustbe zero-force member.

Case2: if three members form a trussjoint for which two of the members arecollinear, the third member is a zero-force member provided no externalforce or support reaction is applied tothe joint.

• Indicate all the members of the trusses shown that have zero force.

(a) (b)

• For the shown truss, determine the force in members EC & EBusing joint method. State if the members are tension orcompression.

• For the shown truss, determine the force in members JH, BJ, BI. Stateif the members are tension or compression. The internal anglebetween any two members is 60. The truss is pin supported at A androller supported at F.

Determine the forces in all themembers of the complex truss.State if the members are in tensionor compression.Hint: Substitute member AD withone placed between E and C.

• Member Si si x*si SiAB 848.53 -1 -1421.86 -573.33BC 848.53 -1 -1421.86 -573.33CD 0 -1.115 -1585.38 -1585.38DE 0 -0.816 -1160.24 -1160.24EF 1005.27 -1.04 -1478.74 -473.47FA 1373.21 -1.44 -2047.48 -674.27EB -1200 1.41 2004.83 804.83FC -1231.19 1.27 1805.77 574.58EC 747.9 -0.526 -747.90 0.00

Determine the reactions at the supports

Cz =360 lbAz =200 lbBz = 40 lbBx = 0 lbAy = 0 lbCy = 0 lb