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Clt mtb seminar_presentation_four


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Clt mtb seminar_presentation_four

  1. 1. Software solutions for LVL building systemsCameron RodgerB.Eng(Civil), MIEAust, MIPENZ, CPENGLVL Business Manager
  2. 2. Agenda• Laminated Veneer Lumber• Material Selection• LVL building design guidelines• Timber engineering design tools - computeIT Suite• Whangarei Dry Mill – a practical design example using computeITtoolkIT• I-beam purlin design• Box beam design• Solid rafter design• Practical considerations• Real examples• TCC Floor Design using computeIT for beams
  3. 3. Laminated Veneer Lumber (L.V.L)• CHH Engineered Wood Products range– Structural LVL – hyONE (E=16.0), hySPAN+ (E=14.0), hySPAN (E=13.2), hyCHORD (E=11.0),hy90(E=9.5), hyJOIST– Use higher grade LVL for primary structural members– Use i-beams or lower grade LVL for secondary framing• Features and benefits– Sourced from renewable plantation pine• Consistent quality raw material availability, carbon storinghelping reduce green house gas omissions• Available FSC Certified– Manufacturing process 3rd party audited• Guaranteed consistent quality– Peeled veneer eliminating naturally occurring defects• Removes localised stress raisers such as knots, etc.• Veneer tested for stiffness and recipes established for each product
  4. 4. Structural L.V.L• LVL is an engineered material with theintrinsic benefits of timber• Suitable for use in fully integrated LVLsystems including:– Built up LVL portal frame components– Composite plywood and LVL purlins– LVL wall framing– TCC Floors– Multi-Storey Structural Systems• Designers can have confidence that thedesign intent will carry through to the finishedstructure
  5. 5. LVL - Material selectionLVL ideal material choice due to adaptability in:– Structural reliability/variability– Production lengths – Limitless (18.3 m practically)– Sections sawn from nominal 1200 mm billet– Thickness variation• Ranging from 28 mm to 105 mm– Type of LVL• Long band• Cross band– Allows for creation of built up sections• Box Beams• Deep I-beams
  6. 6. Portal Suite - Material selection• Cross Band LVL– Dimensional Stability.– Reduces tendency of long band veneers to split from fasteners– Limited stocks readily available, largely a made to order product
  7. 7. LVL Building design guidelines• Design methodology and loading– Design criteria based on structure type not material type– Loading in accordance with relevant loading standards– Footing and bracing design similar to steel systems• Footing sizes an have significant savings in relation to concrete buildings– Optimal member spans and bay/frame spacings may be different fortimber, steel and concrete structural systems
  8. 8. LVL Building design guidelines• Elastic Structural Analysis (Microstran, Spacegass) differslittle to that applied to steel except for structural properties• No separate consideration of shear deflection required forsolid LVL sections– For built up sections adjustments to Poisons ratio required• A number of options for rigid moment resisting connections– X-banded LVL gussets– Quick connect jointing system– Post tension/pre-stressed structural systems• Serviceability limits similar to steel and concrete• Effects of creep need to be taken into account for permanentloads
  9. 9. Design ToolsCHH have produced tools to aid in the design of LVL basedsystems• Software based solutions– computeIT for beams• Now includes TCC Floor Design– computeIT toolkIT• Rigid moment connection design• Member design (solid and built up sections)• Purlin Design• Girt Design– Includes Design details, commonly available products and connections• Alternate commercial product range• Engineering support from experienced consulting timberdesign engineers
  10. 10. computeIT Suite1. Provides LVL Structural solutions for market segments currently limitedto EWP’s through engineering design capability/costs2. Make the design of timber based systems and connections as easy, oreasier than steel alternatives3. Presents proven, cost effective solutions from readily available LVLmembers4. Developed by practicing timber design engineers for engineers5. Interactive design in accordance with regulatory design standards6. Design modules that aid engineers in the interpretation of timberphenomena7. Still allows the design engineer to make the decision about thesuitability of design
  11. 11. computeIT for beamsAn integrated design and analysis package for engineers. Aidsengineers in the understanding of timber design and analysis.Target Market– All engineers (those not comfortable with ‘black box’packages) currently using structural analysis packages andsteel solutions– residential & commercial projects
  12. 12. computeIT for beams• Point of difference– Design & Analysis Package• Allows for entry of predetermined loads for beam designs for all types ofloading for differing beam configurations• Design and analysis for both strength and serviceability limit states– Un-factored loads entered– Factored load cases presented as per AS/NZS 1170.1– Users enter restraint condition– Design in accordance with AS1720– Provides guidance for engineers in relation to timber phenomenons» Shear Deflection» Creep» Duration of load– Importantly, still allows engineer to make the decision about thesuitability of the section
  13. 13. computeIT for beams- Now includes EXPAN/STICtechnologyTimber Concrete Composite (TCC Floors) providing compositeaction between concrete and LVL structural elements.Key Value PropositionProvide a structurally fit for purpose solution that includes alevel of fire resistance and acoustic attenuation.
  14. 14. computeIT toolkITcomputeIT toolkit is a series of design tools to allow for the quickand easy design of rigid moment connections, primary andsecondary membersTarget Market – engineers design commercial and industrialbuildings
  15. 15. computeIT toolkITPoint of difference:– computeIT toolkit provides users with the opportunity to:• design moment resisting connections with commonly available materials andconnectors• design solid and built up members subject to combined actions, easily consideringthe effects of alternate restraint options• Load combinations to AS/NZS 1170, with automatic selection of duration of loadfactor• analyse different members to determine cost effective options• design solid and i-beam purlins and girts, including support and restraint details• create a job specific Engineering Analysis Report including designed members andconnections• Provides guidance for engineers in relation to timber phenomenons– Direction of grain– Duration of load• Review full worked design examples to aid engineers with the adoption of timberengineering
  16. 16. computeIT toolkIT - Now includes EXPAN/STIC technologyQuick Connect moment resisting connection design technologyis now included in computeIT toolkIT.Key Value PropositionThe quick connect technology uses a threaded rod, washersand nuts for ease of connection on site through factory fittedLVL sleeves.
  17. 17. computeIT for PORTAL FRAMES – underdevelopmentcomputeIT for PORTAL FRAMES is a fully integrated design,detailing, specification, and takeoff package for the design ofLVL based portal framesTarget Market – engineers designing portal frame systems- fabricators (costing and fabrication)
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  19. 19. Whangarei Dry Mill – A practical design example• A practical engineering approach including:– Use of box and solid sections– I-beam purlin design options– Optimisation of material usage (and cost)• Fabrication– Importance of using an experiencedfabricator• Peace of mind• Kit-set delivery– Large solid section vs lower volume built upsection• Erection methodology– Bay lifts• Program advantages• OH&S advantages
  20. 20. Whangarei Dry Mill• Cost effective and structurally efficient design to develop a12,210 m2 building• Member selection based on:– Structural integrity,– Material availably, and– Level of fabrication expertise required• Versatility of LVL allowed development of a frame with:– Built up box beams that have cross banded (x-band) LVL webs andLVL flanges in high moment regions– 18.2 m long solid 105 mm thick LVL sections in reduced momentregions, reducing fabrication time and cost.– Off the shelf I-beam purlins at 10 m bays completed the largemanufacturing and storage facility.
  21. 21. Whangarei Dry Mill – Building footprint
  22. 22. Whangarei Dry Mill – ElevationsTwo portal frames proposed to share ridge line
  23. 23. Whangarei Dry Mill
  24. 24. Whangarei Dry Mill
  25. 25. Whangarei Dry Mill – Purlin Layout
  26. 26. Whangarei Dry Mill – Purlin Design1. Reduced spacing– Increased number of components– More on site connections2. Increase flange size/capacity as required– Typical for large buildings– Eliminates multiple spacing adjustments– Capability to manufacture ‘specifically designed’ Ibeams.3. Increase number of lateral restraintsSolution : Mixture of reduced spacing and increased flange size providesoptimum design solutionPurlins within proximity of building edge subject to localised pressure &require:
  27. 27. I-beam Purlin DesignRegion Within ‘a’ fromwindward edgeWithin ‘h’ fromwindward edgeSpan 10000-193 = 9807 10000-105 = 9895Spacing (max) 1380 1600Roof MassRoof sheeting mass 6.5 kg/m2 6.5 kg/m2Miscellaneous 2.0 kg/m2 2.0 kg/m2Wind Loadingweff -1.74 kN/m/m# -1.10 kN/m/m#R* -8.36 kN/m# -5.45 kN/m#weff +0.85 kN/m/m# +0.85 kN/m/m#R* +4.25 kN/m# +4.25 kN/m##Loads/Design action effects per metre load width
  28. 28. Whangarei Dry Mill – Portal Frame Design• Points of contraflexure define component length & splicelocations• Sections developed relative to suitability to resist requireddesign actions– Bending, Axial and Shear forces– Relative stiffness controls moment distribution
  29. 29. Whangarei Dry Mill – Portal Frame Design• Reduced rigidity draws less moment to sections• Ease of in-situ splice with box sections• Ease of fabrication• Section kept to depth to breadth ratio of 10• Flybraces provide lateral restraintSolid 1050x105 LVL section chosen for lower moment region
  30. 30. Whangarei Dry Mill – Portal Frame DesignBox sections chosen for higher moment regions• Hollow section optimises material usage• Provide increased lateral stability• Webs protrude for ease of splicing• Remnant from R2 used as flange
  31. 31. Whangarei Dry Mill – Box Beam DesignCritical Design Actions – R3Load Case M*kNmN*ckNN*tkNV*kN1.35G -259.0 34.9 46.70.9G+Wu 541.0 -114.0 100.01.2G+Wu -589.0 103.0 122.0Note: Flybraces at purlins both sides of C4DesignActionLaymmLaxmmBending(+ve)1600Bending (-ve) 7020Compression 1600 24750
  32. 32. Whangarei Dry Mill - Splice DesignCritical Design Action Effect – 1.2G+1.5Q (over 200 m2 area)M*=150.0 kNm N*c=56.6 kN V*=51.9 kN
  33. 33. Whangarei Dry Mill – Practical considerationUse full width of billet:• Remnant from 1050x105solid rafter used as flangesin box beams• Remnant from 1050x42 2 x-band webs used as sidewall girts
  34. 34. Design and detailing – general tipsSome important considerations in design/detailing:• For webs and slender sections use x-banded LVL• Use billet multiples and standard sections where applicable• Always include fastener spacing and length• Detail components to be fixed during fabrication• Seal/paint all primary/main frame members to limit moistureuptake• Any lamination of components should include a glue‘sealant’ to prevent moisture ingress• Spray paint nail patterns on members in the factory• Pre-drill holes where applicable
  35. 35. Design and detailing – general tipsSome important considerations in design/detailing:• Any factory fitted gusset connections to be glue nailed• If using bay lifts, consider stresses applied duringconstruction at joints• Always include bracketry under supply of fabrication contract• Detail brackets to allow for timber tolerances• Use proprietary brackets where applicable• Always add moisture barriers to column/mullion baseconnections• Box sections can limit the surfaces available to the effects offire• Use an experienced fabricator
  36. 36. Multi-storey building framing
  37. 37. Merritt Building
  38. 38. Merritt Building
  39. 39. Blockhouse Bay Indoor Tennis Centre
  40. 40. MOTAT Aviation Hall
  41. 41. MOTAT Aviation Hall
  42. 42. Diocesan School Pool
  43. 43. hySPAN portal frame in QLD, Australia
  44. 44. McCormick Centre for the Environment – Renmark, SADoweled moment joints with steel fin plates
  45. 45. 32 m clear span Composting facility, 10 m bays
  46. 46. Mt Eden Normal School – TCC Floors
  47. 47. Mt Eden Normal School – TCC Floors
  48. 48. Thank youContact: CHH 1800 808 131