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“Glulam – what is it!?”

“Glulam – what is it!?”. Glulam is …. (Structural) Glued Laminated Timber. …. TIMBER … definition = wood for building specifically = sizeable framing element for a building or other structure. Laminated … … made up of `lams’ …

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“Glulam – what is it!?”

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  1. “Glulam – what is it!?”

  2. Glulam is … (Structural) Glued Laminated Timber

  3. … TIMBER … definition = wood for building specifically = sizeable framing element for a building or other structure

  4. Laminated … … made up of `lams’ … specifically: made up of layers (of smaller wood pieces)

  5. Glued … … lams bonded to one another with glues (adhesives). (The `gluing’ is a big deal.) … the glue bonds (bonded joints) are taken to be stronger than the wood being bonded. (Wood strength controls!)

  6. TIMBERS • BEAMS … and joists, rafters, girders, stringers, etc. • COLUMNS … and posts, and beam-columns • ARCHES … and other curved members

  7. “Smaller wood pieces” ALLOW … • Use of essentially anysizeresource (tree, or recycled wood) • Sorting of the resource, for greater strength, efficiency, and economy (... put the stronger wood where needed) • Bending the individual wood pieces into any curved shape without excessive pre-stress

  8. (lams) how small? … • North America … nominal ... 2 `by’ (any) … for straight beams … (35mm x 35 mm or 35mm x `any’) 1 x or 2 x … for curved (18mm …)

  9. (timbers) how big? • 14-3/8 in. x 58.5 in. x 72 ft North American Western Species softwood glulam beam … … made up of 39 layers 1-1/2 in. thick (38mm) of 2 pieces each … … pieces placed end-to-end would stretch 5616 ft or 1.7 km.

  10. Sometimes each lam is made up of more than one piece. These lams may, ... or may not, be bonded to one another. ( …makes a difference if used flat)

  11. Joints … • Face (layer to layer) • End (the `Finger’ Joint) • Side (pieces in a layer)

  12. The Finger Joint ALLOWS … • Use of essentially ANY length (input) pieces ... (really short) • (to) Manufacture essentially ANY length (output) timber ( ... really long)

  13. `ANY’ (Size) Input Pieces • Allows `cutting’ out strength reducing characteristics • Allows greater `sorting’ (pieces of varying strength characteristics) • Allows greatest economy and efficiency of resource

  14. TYPES OF `LAYUPS’ • UNIFORM Input laminations taken to have same strength properties … Member strength benefits from the `laminating effect’. • OPTIMIZED - BALANCED Higher strength laminations on top and bottom to accommodate higher flexural (extreme fiber) stresses • OPTIMIZED - UNBALANCED Higher strength laminations of bottom (flexural tension) face only … (for use as simple members only)

  15. OTHER SHAPES • Tapered • Curved (Circular) • Curved (`S’ and other) • Curved and Tapered • Arched (and other?)

  16. TRUSSES … and … • Glued Laminated Timbers are often used as member elements of trusses (2-D and 3-D), … and … • As the structural elements of `Domes’ and other structural systems.

  17. ... And let’s not forget! BRIDGES ... Road Pedestrian (and cart)

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