Design of Transmission Tower in SAP2000

• D.L = 30K, L.L= 35k, on top most joint in gravity direction
• Unit = k-ft
• New model = 3D truss.

Transmission Tower

Chord = W18 x 35 Braces = W 18 x 35

Define:

• Define > material, steel, modifying fy = 36 ksi. Fx = 58ksi.

• Define > load cases add D.L & in L.L

• Self wt =0

• Define > add default combo select steel & convert to user check boxes.

• Select top most joints.

Assign

• Assign > Joint loads> forces apply loads.

• Select all.

• Assign > frame> release/Partial fixity, check m³3 both check boxes.

Analyze

• Analyze >select analysis option. Select 3D trauss.

• Display > show forces> frames. Select UDSTL2 & axial force. Uncheck fill , check show values, check boxes and view the values on top most and bottom most members