Forces: Tension and Compression
Structural Analysis
Every bridge must balance two primary forces: Compression (pushing together) and Tension (pulling apart).
Bridge Types & Forces:
- Suspension Bridge: Main cables are in high tension; Towers are in high compression. Best for long spans (e.g., Golden Gate).
- Arch Bridge: The entire structure is in compression. The force is transferred outward to the abutments.
- Beam Bridge: The top of the beam is in compression, bottom is in tension. Limited span length.