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Structural Form

Structural Form. The part of a structure that must transmit applied loads is the structural system. The mode of transmission is a function of geometrical configuration, or form. The basic modes, or “actions” may be: Tension Compression Flexure (Bending) Shear [Torsion (Twisting, Shear)]

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Structural Form

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  1. Structural Form The part of a structure that must transmit applied loads is the structural system. The mode of transmission is a function of geometrical configuration, or form. The basic modes, or “actions” may be: Tension Compression Flexure (Bending) Shear [Torsion (Twisting, Shear)] These may be combined in many structural forms, as seen in the following examples: Notes: Structural Actions, Form and Systems

  2. Godden, B47 Basic Structural Elements: Tension—The Tie Rod • Single, axial-force element • Studied in ENGRD 202 Idealized Real Notes: Structural Actions, Form and Systems

  3. Basic Structural Elements: Tension--The Cable • Single, axial, tensile force element • Form-active Idealized Real Notes: Structural Actions, Form and Systems

  4. Column Beam-Column Metallic Shapes Godden, F43 RC Shapes Basic Structural Elements: Compression--The Column Idealized • Multiple Force: Axial, Shear, Moment • Studied in ENGRD 202 Real Notes: Structural Actions, Form and Systems

  5. Idealized RC Arch No Hinges Godden, B28 Real: 3 Hinges Basic Structural Elements: Compression--The Arch • Can be single force = Funicular, or... • Multiple Force: Axial, Shear, Moment • Can Have 1, 2, or 3 Hinges Notes: Structural Actions, Form and Systems

  6. Tapered/Haunched Built-Up Idealized Basic Structural Elements: Flexure--The Beam Beam: A Multiple Force Element • Multiple Force: Shear, Moment, Axial • Studied in ENGRD 202 Simply Supported Cantilever Fixed-Fixed Multiple span continuous Godden A56 Real Notes: Structural Actions, Form and Systems

  7. Basic Elements May Be Simplifications of 2D and 3D Surface Elements 1D Rod [Shear on non-orthogonal section] 2D Plate in Biaxial Tension (“Plane Stress”) [Note: if S1 S2, shear will be present] Notes: Structural Actions, Form and Systems

  8. 1D Beam [Torsion?] Godden, F80 Real 2D Plate in Bending [Twisting possible] Basic Elements May Be Simplifications of 2D and 3D Surface Elements Idealized Notes: Structural Actions, Form and Systems

  9. Cable Godden, E35.3 Real Pressure Vessel/Membrane Basic Elements May Be Simplifications of 2D and 3D Surface Elements Idealized Notes: Structural Actions, Form and Systems

  10. Arch Godden E35.1 Real Shell:eg. Dome Basic Elements Are Simplifications of 2D and 3D Surface Elements Idealized Notes: Structural Actions, Form and Systems

  11. Real Gear Idealized Transmission Represented with Finite Elements Idealized Geometry Model of Gear It May Not Be Feasible/Useful to Simplify Complicated Solids Notes: Structural Actions, Form and Systems

  12. Idealized Godden, F64 Real Basic Elements Can Be Combined Into Structural Systems Beams + Columns = Frame Notes: Structural Actions, Form and Systems

  13. Real Basic Elements Can Be Combined Into Structural Systems Tie Rods + Columns = Truss Idealized Notes: Structural Actions, Form and Systems

  14. Real Basic Elements Can Be Combined Into Structural Systems Beam/columns + shell = aircraft fuselage Idealized Section Represented with Finite Elements Notes: Structural Actions, Form and Systems

  15. Godden, D67 Real Some Planar Structural Systems Are Simplifications of 3D Systems Idealized Plane Truss Space Truss Notes: Structural Actions, Form and Systems

  16. Idealized Plane Frame Godden, F62 Real Space Frame Some Planar Structural Systems Are Simplifications of 3D Systems Notes: Structural Actions, Form and Systems

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