Sample
Summaries after sample
, U2: Electrical Pylons U1: Frame Structure: Definition
• Open structure made of members.
• Support high-voltage cables. • Different from solid structures.
• Carry power from generation sites (e.g. • Also called trusses.
Mpumalanga) to users.
Pylon Design Case Study Roof Trusses
• Support roofs of buildings.
• Designs vary, but all are rigid due to triangular shapes.
• Triangles prevent collapse in frame structures.
C1: U1: What is a • Made from wood or steel.
frame structure?
Sample
•
U2: Electrical
Why Triangles? Roof Truss Members
pylons
• Only triangles are naturally rigid. • Span = distance between walls.
• Other shapes deform under force. • Rafters: Main supports for roof.
•
Summaries after sample
Cross-Bracing
Resists torsion (e.g. wind).
•
•
•
•
King post: Supports rafters’ top ends.
Queen posts: Support long spans.
Tie beams: Prevent rafters collapsing.
Wall plates: Sit on walls, support tie beams.
• Uses diagonal members for extra stability.
Tension vs Compression
in Structures
Forces on Structures • Tension: Member moves apart → it’s a
tie.
• Tension: Pulls, stretches (tie). • Compression: Member overlaps → it’s
• Compression: Pushes, squashes (strut). a strut.
• Shear: Cuts across.
• Torsion: Twists.
GR8 LO T1:U1-4 Mind Map Today Copyright © www.summariessa.co.za (DO NOT COPY)
, Sample
Summaries after sample
Summaries after sample
, U2: Electrical Pylons U1: Frame Structure: Definition
• Open structure made of members.
• Support high-voltage cables. • Different from solid structures.
• Carry power from generation sites (e.g. • Also called trusses.
Mpumalanga) to users.
Pylon Design Case Study Roof Trusses
• Support roofs of buildings.
• Designs vary, but all are rigid due to triangular shapes.
• Triangles prevent collapse in frame structures.
C1: U1: What is a • Made from wood or steel.
frame structure?
Sample
•
U2: Electrical
Why Triangles? Roof Truss Members
pylons
• Only triangles are naturally rigid. • Span = distance between walls.
• Other shapes deform under force. • Rafters: Main supports for roof.
•
Summaries after sample
Cross-Bracing
Resists torsion (e.g. wind).
•
•
•
•
King post: Supports rafters’ top ends.
Queen posts: Support long spans.
Tie beams: Prevent rafters collapsing.
Wall plates: Sit on walls, support tie beams.
• Uses diagonal members for extra stability.
Tension vs Compression
in Structures
Forces on Structures • Tension: Member moves apart → it’s a
tie.
• Tension: Pulls, stretches (tie). • Compression: Member overlaps → it’s
• Compression: Pushes, squashes (strut). a strut.
• Shear: Cuts across.
• Torsion: Twists.
GR8 LO T1:U1-4 Mind Map Today Copyright © www.summariessa.co.za (DO NOT COPY)
, Sample
Summaries after sample
