1 / 29

Jason S. Hanlon, PE, MLSE Braun Intertec Corporation September 30, 2013

Standardized Load Tables Characterizing Residential Solar Thermal and Solar Electric Installations For Residential Structures in Minnesota. Jason S. Hanlon, PE, MLSE Braun Intertec Corporation September 30, 2013. Overview. Establishing Analysis/Review Criteria Research and Analysis

beth
Download Presentation

Jason S. Hanlon, PE, MLSE Braun Intertec Corporation September 30, 2013

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Standardized Load Tables Characterizing Residential Solar Thermal and Solar Electric Installations For Residential Structures in Minnesota Jason S. Hanlon, PE, MLSE Braun Intertec Corporation September 30, 2013

  2. Overview • Establishing Analysis/Review Criteria • Research and Analysis • Pre-Manufactured Trusses • Roof Rafters • Rafter Tables

  3. Establishing Analysis/Review Criteria • Closely match IRC content • Consider conditions common to MN • Consider Types of Roof Mounted Solar Technologies

  4. Establishing Analysis/Review Criteria • Closely match IRC content • Spans presented try to closely match that shown in IRC Tables • Wood Species • Roof Pitches

  5. Establishing Analysis/Review Criteria • Closely match IRC content • Consider conditions common to MN • Wood Species --- Old Doug-Fir • Design Loading Criteria • Based on 2007 MSBC, 2006 IRC/IBC and ASCE 7-05 • Wind Load Exposure B, C, and D • Dead Weight • One Layer ½-inch OSB/Plywood or ¾-inch plank board • One layer asphalt shingles

  6. Establishing Analysis/Review Criteria • Closely match IRC content • Consider conditions common to MN • Consider Types of Roof Mounted Solar Technologies • Photovoltaic Panels supplementing electrical services • Solar Thermal Panels supplementing heating services

  7. Research and Analysis • Pre-Manufactured Wood Trusses • Challenges • Things to consider • Roof Rafters

  8. Research and Analysis – Pre-Manufactured Wood Trusses • Challenges • Common design layout hard to define • Wood trusses are “efficiently” designed. • Controlling component will be the nailer plates

  9. Research and Analysis – Pre-Manufactured Wood Trusses • What to consider • Common design throughout the industry: • Top Chord DL = 7 psf • Bottom Chord DL = 10 psf • Changes in Code prescribed Snow Load

  10. Research and Analysis – Pre-Manufactured Wood Trusses 1998-Previous MSBC 2003-Current MSBC

  11. Research and Analysis – Pre-Manufactured Wood Trusses • Roof snow load decreased by 5 psf • Roof snow load increased by 5 psf • Roof snow load increased by 12 psf • Roof snow load increased by 2 psf Summary of Design Load Adjustments

  12. Research and Analysis – Roof Rafters (Hand-Framed Construction) • Framing Conditions • Snow Loading • Wind Loading • Material Selfweight • Allowable Stress Design

  13. Research and Analysis – Roof Rafters (Hand-Framed Construction) • Framing Conditions • Use of Ridge Nailer Plate (not a ridge beam) • Outward thrust is resolved at exterior wall bearing

  14. Research and Analysis – Roof Rafters (Hand-Framed Construction)

  15. Research and Analysis – Roof Rafters (Hand-Framed Construction) • Framing Conditions • Use of Ridge Nailer Plate (not a ridge beam) • Outward thrust is resolved at exterior wall bearing • Allowable stress values taken from NDS (National Design Standard) for Wood Construction and Historical Douglas Fir Use Book

  16. Research and Analysis – Roof Rafters (Hand-Framed Construction) • Framing Conditions • Snow Loading • Exposure Rating B, C and D • Design for Snow Drifting not required per IRC • Limit installation angle of panel so drifting is limited to design depth of snow • Tables presented for different lengths between PV and Solar Panels

  17. Research and Analysis – Roof Rafters (Hand-Framed Construction)

  18. Research and Analysis – Roof Rafters (Hand-Framed Construction) • Framing Conditions • Snow Loading • Wind Loading • Structures 30-ft. or less in height (average) • Not located near isolated hills or ridges or other abrupt changes in topography • Followed ASCE 7-05. Slight changes in ASCE 7-10 (decrease)

  19. Research and Analysis – Roof Rafters (Hand-Framed Construction) • Framing Conditions • Snow Loading • Wind Loading • Material Selfweight • Member DL based on wood species, size, and spacing

  20. Research and Analysis – Roof Rafters (Hand-Framed Construction) • Framing Conditions • Snow Loading • Wind Loading • Material Selfweight • Allowable Stress Design • Shear • Bending/Compression • Deflection

  21. Rafter Tables • Info needed to determine which table to use • Wood Species • Grade of Wood • Spacing • Ground Snow Design Requirement • Exposure Classification

  22. Rafter Tables • Info needed to determine which table to use

  23. Rafter Tables • Info needed to use the table • Rafter Pitch • Rafter Size • Projected Rafter Span

  24. Rafter Tables

  25. Rafter Tables

  26. Rafter Tables

  27. Rafter Tables • Reinforced Rafter Tables • Similar Analysis approach • Uses a sistered 2x4 member of equal or greater species and grade • Installed as follows:

  28. Rafter Tables

  29. Questions???

More Related