Structural Engineering part 2

1. Structural Eng Part 2
Def – analysis and design of structure
that resist load

2. Load
• Static and Dynamic
– Static
• Dead
– Self weight of structure
• Live
– Movable (human, furniture)
• Environmental
– Snow, accumulation of rainwater
• Soil and hydraulic
– Foundation of structure, dam, retaining wall

3. Load
– Dynamic
• Environmental
– Wind (Sway, effects both sides)
– Earthquake (Twist)
• Impact
– Sudden high level magnitude load
» (eg. Jetty, airport runway)

4. Load
• Shapes of load
– Uniformly Distributed Load (UDL)
• Dead and live loads, on beam or slab
• Hydraulic & soil load, on surface of structure’s
foundation & dam
– Uniformly Varying Load (UVL)
• Linearly (triangular) or parabolic
• Soil & hydraulic load on side walls of the structure
– Point or concentrated load
• On column or from column

5. Supports
• Main component of structure
– Carry load of the structure
• Resist
1. vertical load (live & dead)
2. Horizontal load (wind & earthquake)
3. Rotation

6. Supports
• Pin & Hinge
– Resist by rotation on vertical &horizontal
– Direction vertical & horizontal
– 2 Unknown
• Roller, Rocker & Frictionless surface
– Resist perpendicular load
– Move parallel
– 1 unknown

7. Supports
• Fixed support
– Resist horizontal, vertical & rotation
– No movement
– 3 unknown
• Linked and Cable support
– Resist parallel load
– Cable take tension only
– Linked usually take compression (often tension)
– 1 unknown

8. Supports
• Fixed collar support
– Resists perpendicular load & sometimes rotation
– 1 or 2 unknown

9. Combination of Load & Support
• Simply supported beam
• Simply supported beam with internal hinge (2
span)
• Cantilever beam
• Continuous beam
• Fixed end beam
• Fixed pinned beam
• Overhanging beam
• Propped beam

10. Combination of Load & Support
• Simply supported beam
– 1 pin + 1 roller support
– 3 unknown
• Simply supported beam with internal hinge
– 1 pin + 1 roller + 1 internal hinge (sometimes have
1 unknown if no horizontal load)
– 4 or 5 unknown

11. Combination of Load & Support
• Cantilever beam
– 1 fixed end + 1 free end
– 3 unknown
• Continuous beam
– 2 or more fixed or more than 4 hinge or 1 hinge +
3 roller
• Fixed end beam
– 2 fixed end

12. Combination of Load & Support
• Fixed pinned beam
– 1 fixed end + 1 pinned end
• Overhanging beam (cantilever with backspan)
– 1 pinned + 1 roller with cantilever overhang at one
or both side
• Propped beam
– 1 fixed + 1 roller