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2.0 Framework Structural System
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  • 1. izsd@yahoo.com2.0 FRAMEWORK STRUCTURAL SYSTEM
  • 2. izsd@yahoo.comRecognize types and definition offramework structural systems: a. Column and beam b. Cantilever c. Truss d. Space Frame e. Geodesic Frame
  • 3. izsd@yahoo.comCOLUMN & BEAM
  • 4. izsd@yahoo.com DEFINITIONDEFINITION > COLUMN A rigid, relatively slender structural member designed primarily to support axial, compressive loads applied at the member ends.DEFINITION > BEAM A rigid structural member designed to carry & transfer transverse loads across space to supporting elements. POST & BEAM SYSTEM @ POST & LINTEL SYSTEM A simple construction method using a lintel, header, or architrave as the horizontal member over a building void supported at its ends by two vertical columns, pillars, or posts.
  • 5. izsd@yahoo.comPOST AND BEAM STRUCTURES• Most architectural structures are of the post-and-beam type.• Post and beam buildings carry the weight of their structural components(and the weight of objects and people in them) by bearing on one another.• The weight of the roof and beams is carried by the posts down to the foundation and then into the ground. Horizontal beams are subject to bending loads, therefore the structural materials should be able of resisting both tension and compression.• We can further subdivide the post and beam structures into:
  • 6. izsd@yahoo.comLOAD BEARING WALLS 6
  • 7. izsd@yahoo.comLOAD BEARING WALLS
  • 8. izsd@yahoo.comLOAD BEARING WALLS
  • 9. izsd@yahoo.comSKELETON FRAME
  • 11. izsd@yahoo.comEXAMPLES (nature) Tree branches
  • 12. izsd@yahoo.comEXAMPLES (nature) Banyan tree
  • 13. izsd@yahoo.comCANTILEVER
  • 14. izsd@yahoo.com DEFINITION CANTILEVER A beam @ other rigid structuralmember extending beyond a fulcrum &supported by a balancing member @ a downward force behind the fulcrum. Diagram of loading
  • 15. izsd@yahoo.com DEFINITION CANTILEVER BEAMA projecting beam supported at only one fixed end. Diagram of loading
  • 16. izsd@yahoo.comEXAMPLES (nature) Cantilever Stone
  • 17. izsd@yahoo.comEXAMPLES (nature) Oyster Mushroom
  • 18. izsd@yahoo.comEXAMPLES (nature) Tree
  • 19. izsd@yahoo.comTRUSS
  • 20. izsd@yahoo.com DEFINITION A structural frame based on the geometric rigidity of the triangle & composed of linear members subject only to axial tension @ compression.1. PLANAR TRUSSDEFINITION:A truss all of whosemembers lie in a singleplane (two dimensionalplane).• E.g: roofs, bridges2. SPACE FRAMETRUSS
  • 21. izsd@yahoo.com EXAMPLES (nature) Wing Bones of a BirdWarren TrussBridge
  • 22. izsd@yahoo.com EXAMPLES (nature) Pelvic Bones of a BirdKingPostTruss
  • 23. izsd@yahoo.comTYPES
  • 24. izsd@yahoo.com
  • 25. izsd@yahoo.comSPACE FRAME @ space structure
  • 26. izsd@yahoo.com DEFINITION Three-dimensional framework of members pinned at their ends. • A tetrahedron shape is the simplest space truss, consisting of six members which meet at four joints.Simple tetrahedron Diagram of a planar space frame such as used for a roof
  • 27. izsd@yahoo.comMaterial: structural steel pipe, tubing, channels, tees @ W-shapesConnectors: Members/struts nodes threadedwelded connection bolted connection connections
  • 28. izsd@yahoo.comEXAMPLES (nature) Bone Structure
  • 29. izsd@yahoo.com1. SKELETON TYPES FRAMEWORK (braced)• Number of bars interconnected at the nodes.• e.g. domes, barrel vaults, double and multiplier grids, braced
  • 30. izsd@yahoo.com TYPES2. STRESSED-SKIN SYSTEMS• Thin sheet material +rigid frame = STRESSED SKIN• Used in aircraft, the space shuttle, unit body automobiles.• e.g. Stressed skin folded plates, stressed skin domes and barrel vaults, pneumatic structures.
  • 31. izsd@yahoo.com TYPES3. SUSPENDED STRUCTURES (cable or membrane)• Form of long-span structure that is subject to tension and uses suspension cables for support.• e.g. Cable roofs. Material - PTFE-coatedfibreglass & PVC-coatedpolyester.Nature - spider web
  • 32. izsd@yahoo.comGEODESIC FRAME
  • 33. izsd@yahoo.com DEFINITION A steel dome having members which follow three principal sets of great circles intersecting at 60°, subdividing the dome surface into series of equilateral spherical triangles.The more complex this system of triangles, the more spherical the dome becomes.
  • 34. izsd@yahoo.comTYPES 1. Struts: Struts are the force members in a geodesic dome that act in compressive and tensile forces to resist loading. 2. Pins: The pins are used at vertices to hold the struts together. 3. Substructure: The foundation transfers loads from the superstructure down into the earth.