Beams

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Beams
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• Simple beam rests on supports at both ends, with
  the ends to rotate and having no moment
  resistance.

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• A cantilever is a projecting beam or other rigid
  structural member supported at only one fixed
  end.

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A cantilever is a projecting beam or other
rigid structural member supported at only one
fixed end.
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• An overhanging beam is a simple beam extending
  beyond one of its supports.
• Double overhang beam is a simple beam extending
  beyond both of its supports.

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• Fixed end beam has both ends restrained against
  rotation.
• Suspended-span is a simple beam supported by the
  overhangs of two adjoining spans with a pinned
  construction joints.

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• Beams are rigid structural members designed to
  carry and transfer transverse loads across space
  to supporting elements.
• The concurrent pattern of forces subjects a beam
  to
• bending and deflection
• which must be resisted by the internal
  strength of the material.

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• Deflection is the perpendicular distance a
  spanning member deviates from a true course
  under transverse loading, increasing with load
  and span.

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• Bending moment an external moment tending the
  cause of a structure to rotate or bend.
• Resisting moment an internal moment equal and
  opposite to a bending moment, generated by a
  force couple to maintain equilibrium of the
  section to be considered.

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Trusses

• Truss is a structural frame based on the
  geometric rigidity of the triangle and composed
  of linear members subject to axial tension and
  compression.

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Parts of a Truss

• Top Chord
• Bottom Chord
• are the principal members of a truss
  extending from end to end and connected by web
  members.
• 3. Web is the integral system of members
  connecting the upper and lower chords of a truss.

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• 4. Panel refers to any of the spaces within the
  web of a truss between any two panel points on a
  chord and a corresponding joint or pair of joints
  on an opposite chord.
• 5. Heel is the lower, supported end of a truss.

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• 6. Panel point is any of the joints between a
  principal web member and a chord.
• A truss may be loaded only on its panel points.

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• Building Construction Illustrated
• Francis D. K Ching