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Woodworks: Five-Story Wood-Frame Structure Over Podium Slab FRONT COVER DESIGN EXAMPLE Five-Story Wood-Frame Structure over Podium Slab ROOF 2nd. FLOOR 1st. FLOOR Developed for WoodWorks by Douglas S. Thompson, PE, SE, SECB STB Structural Engineers, Inc. Lake Forest, CA $FRA-593_Five-Over-One_TechDoc_Dec2017.indd 1 12/7/17 11:18 AM INSIDE FRONT COVER $FRA-593_Five-Over-One_TechDoc_Dec2017.indd 2 12/7/17 11:18 AM Free design and engineering support for non-residential and multi-family wood buildings WoodWorks provides free Five reasons to choose wood for your next project: resources that allow engineers, Wood typically provides more value—in terms of its beauty, architects and others to design design flexibility and environmental attributes—for less cost than and build non-residential and other major building materials, all while meeting fire, safety and other code requirements. multi-family structures out 1. Wood costs less – In addition to lower material costs, of wood more easily and at wood building systems typically cost less to install than other less cost. This includes free materials. Wood construction is fast, and wood’s relative light weight reduces the need for foundation capacity and one-on-one project assistance associated costs. as well as educational events 2. Wood structures meet code – The International Building Code recognizes wood’s safety and structural performance and online resources such as capabilities and allows its use in a wide range of building CAD/REVIT details, case studies, types, from multi-story condominiums and offices to schools, restaurants, malls and arenas. and Continuing Education Units. 3. Wood performs well in earthquakes and high winds – Because wood-frame buildings are lighter and have more repetition and ductility than structures built with other For tools and resources materials, they are very effective at resisting lateral and uplift forces. related to multi-story 4. Wood is versatile and adaptable – Wood’s design wood buildings, visit flexibility lends itself both to traditional and innovative uses. With the exception of major members that are made to spec www.woodworks.org and off site, wood can be adapted in the field, allowing quick look under Building Types, solutions if changes are required. Wood is also well suited to additions and retrofits, and wood systems can be dismantled Multi-Residential/Mixed-Use. with relative ease and the materials used elsewhere. 5. Using wood helps reduce your environmental impact – Wood grows naturally and is renewable. Life cycle assessment studies also show that wood buildings have less embodied energy than structures made from steel or concrete, are responsible for less air and water pollution, and have a lighter carbon footprint. For more information, visit: woodworks.org $FRA-593_Five-Over-One_TechDoc_Dec2017.indd 3 12/7/17 11:18 AM Table of Contents UPDATE NOTE – In September 2016, updates were made to the following sections: 4a. Stiffness Determinations, 4b. Period Determinations, and 6h. Determine Resisting Moments and Uplift Forces. In November 2017, additional changes were made to 4a. Stiffness Determinations, and 4b. Period Determinations. PART I – Overview Overview ............................................................................................................. 4 Codes and Reference Documents Used ................................................................ 5 Factors that Influence Design ............................................................................... 5 Species of Lumber ........................................................................................ 5 Grade of Lumber .......................................................................................... 5 Moisture Content and Wood Shrinkage ........................................................ 6 Condition of Seasoning ................................................................................ 6 Location of Shear Walls ................................................................................ 6 Support of Floor Joists .................................................................................. 7 Given Information ............................................................................................... 7 PART II – Structural and Non-structural 1. Seismic Height Limitation ............................................................................... 10 2. Fire and Life Safety ......................................................................................... 10 a. Height and Area Allowances ..................................................................... 10 b. Fire Resistance .......................................................................................... 11 c. Fire Retardant-Treated Wood .................................................................... 12 3. Vertical Displacement (Shrinkage) in Multi-Level Wood Framing ...................... 14 a. Comprehensive Shrinkage Estimation ....................................................... 15 b. Quick Shrinkage Estimation ...................................................................... 16 PART III – Seismic Design 4. Two-Stage Design for Seismic Lateral Analysis ................................................. 20 a. Stiffness Determinations ........................................................................... 20 b. Period Determinations .............................................................................. 21 c. Design of Flexible Upper Portion ............................................................... 23 d. Design of Rigid Lower Portion .................................................................. 23 5. Seismic Design of Flexible Upper Portion and Rigid Lower Portion ................... 24 a. Seismic Design of Flexible Upper Portion .................................................. 24 b. Assumption of Flexible Diaphragms .......................................................... 30 c. Flexible vs. Rigid Diaphragm Analysis ........................................................ 30 d. Flexible Upper Portion Redundancy Factor ................................................ 31 e. Seismic Design of Rigid Lower Portion ...................................................... 31 2 | Table of Contents $FRA-593_Five-Over-One_TechDoc_Dec2017.indd 4 12/7/17 11:18 AM 6. Shear Wall Design Example .............................................................................. 31 a. Determination of Lateral Loads to Shear Wall ........................................... 31 b. Determination of Shear Wall Sheathing and Nailing .................................. 33 c. Shear Wall Cumulative Overturning Forces ................................................ 33 d. Load Combinations using 2012 IBC .......................................................... 34 e. Load Combinations using 2012 ASCE 7-10 ................................................ 34 f. Shear Wall Chord (Boundary) Members ..................................................... 35 g. Example Compression Member Capacity Determination ........................... 39 h. Determine Resisting Moments and Uplift Forces ....................................... 40 i. Shear Wall Tie-Down System Components ................................................ 41 7. Considerations with Continuous and Discontinuous Anchor Tie-Downs ........... 45 8. Shear Wall Deflection, Tie-Downs and Take-Up Devices................................... 46 a. Continuous Tie-Down Assembly Displacement ......................................... 46 b. Shear Wall Deflection ............................................................................... 51 c. Story Drift Determination .......................................................................... 54 d. Load Path for Rod Systems ....................................................................... 56 e. Proprietary Software for Continuous Tie-Down Systems ........................... 58 9. Discontinuous System Considerations and the Overstrength (Ω) Factor ............ 58 a. Anchor Forces to Podium Slab .................................................................. 58 PART IV – Wind vs. Seismic Design with Wind Controlling 10. Use of Gypsum Board for Lateral Resistance .................................................. 60 11. Use of Cooler Nails vs. Screws for Gypsum Board Fastening ........................... 61 12. Wind Loading Analysis – Main Wind-Force Resisting System .......................... 61 a. Determination of Design Coefficients for Transverse Direction .................. 62 b. Determination of Design Coefficients for Longitudinal Direction ............... 64 13. Seismic Loading Analysis ................................................................................ 66 a. Design Base Shear .................................................................................... 66 14. Wind and Seismic Forces to Typical Interior Transverse Wall ........................... 67 a. Determination of Shear Wall Fastening ..................................................... 68 b. Determination of Shear Wall Chord (Boundary) Forces and Members ....... 69 c. Determination of Shear Wall Uplift Forces ................................................. 71 15. Wind and Seismic Forces to Typical Interior Corridor Wall ............................... 72 a. Determination of Shear Wall Fastening ..................................................... 73 b. Determination of Shear Wall Chord (Boundary) Forces and Members ....... 74 c. Determination of Shear Wall Uplift Forces ................................................
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