Educational Session: Wednesday, March 28th 8:00 - 9:30 A.M.
Matsen Ford Design Associates, Inc. Waukesha, Wisconsin
¨ Load Bearing and Exterior CFS Stud Walls § Cold-Formed Steel NOT Light Gauge ¨ Floor System ¨ Roof System ¨ Lateral Force Resisting System
¨ ‰ Typical Stud Walls (Aligned @ 16 ” or 24 ” o.c.) Generic Design § ‰ Proprietary § ‰ Top Track Designed Based on Floor System § ‰ HSS Distribution § ‰ ¨ ‰ Openings Headers (Generally Boxed) § ‰ Jambs (King Studs + Shoulder Studs) § ‰
Courtesy of: Wall-Tech, Inc .
¨ ‰ CFS Joists (16 ” or 24 ” o.c.) Generic or Proprietary (8 ” to 16 ” deep) § ‰ Cementitious Board or Floor Deck w/ Lightweight § ‰ Topping (1 ½ ” to 2 ” thickness) ¨ ‰ Long Span Deck Typical Composite Profile § ‰ Dovetail Profile § ‰ Typically 4 ” to 6 ” total thickness § ‰
¨ ‰ Proprietary Composite Joist System (48 ” o.c.) Delegated Design (L/D=20) § ‰ Concrete Slab or Slab-on-Deck § ‰ 3 ” - 4 ” Slab + Joist Depth § ‰ ¨ ‰ Hollow Core PCC Plank Delegated Design § ‰ Set w/ Crane § ‰ Typically 8 ” PCC Plank + Topping § ‰
¨ ‰ CFS Trusses (24 ” to 48 ” o.c.) Delegated Design (L/D=20) § ‰ Top or Bottom Chord Bearing § ‰ Cementitious Board or Floor Deck w/ Lightweight § ‰ Topping (1 ½ ” to 2 ” thickness)
¨ ‰ CFS Joists (16 ” or 24 ” o.c.) Generic or Proprietary (8 ” to 16 ” Deep) § ‰ Cementitious Board or Roof Deck w/ Rigid § ‰ Insulation and Membrane ¨ ‰ Long Span Deck Typical Composite Profile § ‰ Dovetail Profile § ‰ Typically 4 ” to 6 ” Thickness w/ Rigid Insulation § ‰ and Membrane
¨ ‰ Proprietary Composite Joist System (48 ” o.c.) Delegated Design (L/D=20) § ‰ Concrete Slab or Slab-on-Deck § ‰ 3 ” - 4 ” Slab w/ Rigid Insulation and Membrane § ‰ ¨ ‰ Hollow Core PCC Plank Delegated Design § ‰ Set w/ Crane § ‰ Typically 8 ” PCC Plank w/ Rigid Insulation and § ‰ Membrane
¨ ‰ CFS Trusses (24 ” to 48 ” o.c.) Flat or Sloping § ‰ Top or Bottom Chord Bearing § ‰ Cementitious Board or Roof Deck w/ Rigid § ‰ Insulation and Membrane
¨ ‰ CFS Shear Walls X-Braced § ‰ Diaphragm (Gyp. Board, Steel Sheet, Proprietary) § ‰ ¨ ‰ Stair and Elevator Cores CMU § ‰ Cast-In Place Concrete § ‰ Pre-Cast Concrete § ‰
¨ Metreau Apartments is a mixed-use luxury apartment complex located on the Fox River in Green Bay, WI. The eight story project features seven stories of residential units above the first story retail and amenities level and lower level parking. ¨ The residential levels are a mix of studio, one and two bedroom and penthouse units. The amenities level features a Community Room, Fitness Center, Media Lounge and Sun Deck. ¨ Cold-Formed Steel Framing is featured as the primary gravity and lateral load carrying structure at the residential levels above a pre-cast concrete transfer structure. All CFS walls and floors were panelized offsite and delivered to the site. ¨ 170,000 ft 2 Total, 114,000 ft 2 @ CFS Levels.
¨ The upper seven stories are cold-formed steel framed bearing walls and C-Joist floors with flat CFS pre-fabricated roof trusses. ¨ The first story and lower level is PCC post-and- beam framing supporting PCC floor at 1 st and 2 nd floor transfer/podium slab. ¨ The foundation consists of concrete filled steel piles and pile caps w/ grade beams. ¨ The main lateral resisting system is a mix of X- braced CFS shear walls and PCC stair and elevator shear walls at the residential levels transferring thru the podium level diaphragm into PCC shear walls at the first level.
Loads and Serviceability Limits
Cast-In-Place & Pre-Cast Concrete
¨ Concrete Filled Piles w/ Pile Caps: § Poor Soil Bearing Capacity vs. Building Loads § Proximity to river § 10 3/4 ” x 3/8 ” Piles § Pile Caps vary from 2 ’ -6 ” to 3 ’ -11 ” deep supporting groups of 1 to 30 Piles ¨ Grade Beams: ¡ 24 ” x 24 ” ¨ Slabs-on-Grade: ¡ 5 ” w/ WWF typically at lower level parking
Courtesy of: Wall-Tech, Inc .
¨ Post & Beam (Lower Lvl. & Level 1): ¨ Transfer Slab (Level 2): § Transfers Gravity and Lateral Loads § Line Loads and Point Loads (Gravity & Lateral) Provided to PCC Designer by MFDA. ¨ Shear Walls: § 12 ” Thick Solid Stair and Elevator Cores § Transfer Beams below shear walls § Lateral Loads to Stair and Elevator Walls provided by MFDA
Courtesy of: Wall-Tech, Inc .
Roof Trusses, Floor Joists and Wall Framing
¨ ‰ 36 “ Pre-Fabbed CFS Trusses @ 24 ” o.c. 36 ” Deep (Typ.) w/ 12 ” Deep at Corridors § ‰ Spans up to 44 ’ -3 ” § ‰ 1 ½ ” x 22 Gage Type B Deck § ‰ ¨ ‰ Supported by CFS Stud Walls @ 16 ” o.c. CFS Distribution Device for Off-Module Transfer § ‰ ¨ ‰ Fall Arrest Anchors Built into Trusses ¨ ‰ Delegated Design Submittal ¨ ‰ Pre-Fabricated off-site
Exterior Bearing w/ Parapet Interior Bearing Exterior Non-Bearing w/ Parapet
¨ 12 ” x 16 gage (54 mil) to 12 gage (97 mil) C- Joists (2 ” flange) @ 16 ” o.c. were used at Living Spaces & Terrace spans up to 26 ’ (Longer spans doubled at Terraces) Spans up to 26 ’ (Longer spans doubled at § Terraces) ¨ 8 ” x 16 ga. (54 mil) C-Joists @ 16 ” o.c. were used at Corridors ¨ Strap & Blocking required @ +/- 6 ’ -0 ” o.c. ¨ Fastened to end tracks & studs walls with 14 ga. (68 mil) clips, Alternate for TradeReady Rim Tracks
¨ End track was used in many locations to eliminate the need for load bearing headers ¨ 9/16 ” x 22 ga. Type C Deck with LevelRock flooring between studs walls (1 ½ ” total) ¨ Fall Arrest anchors built into terrace joists w/ HSS welded into webs of double joists ¨ Joists and End Tracks welded to embed plates at PCC shear walls for lateral load transfer ¨ Floor Panel Drawing were reviewed by design team for member and dimensional accuracy ¨ Pre-Fabricated Floor Panels built off-site
Exterior Bearing Interior Bearing
Connection at PCC Shear Wall (Gravity & Lateral Transfer) Fall Arrest Bracing at Terrace
Courtesy of: Wall-Tech, Inc .
¨ 6 ” x 12 gage (97 mil) to 18 gage (43 mil) C-Studs (1-5/8 ” to 3 ” flanges) were used at exterior and interior bearing cases; 18 gage at exterior non-bearing cases; all spaced at 16 ” o.c. typ. ¨ ALL STUDS ALIGNED FROM FLOOR-TO-FLOOR ¨ Parapets designed for Fall Arrest Loading ¨ Bridging was cold-rolled channel with 16 gage clip angles (or proprietary clips) @ 48 ” o.c. ¨ Top tracks were 1 ¼ ” flange of matching gage at non- shear walls; Bottom tracks were 3 ” flange of matching gage Pour Stop for floor topping and fastening surface § for gypsum board
¨ Boxed Headers were used at typical load bearing openings with King + Shoulder Stud Jambs ¨ Rim Tracks and End Joists carry gravity loads at NLB openings and narrow LB openings with single BAF jamb studs ¨ Wall Panel Drawings were reviewed by design team for member and dimensional accuracy ¨ Walls were prefabricated off-site § Stud panels were compressed for tight seating in top and bottom track § Typical fabrication was done with screw attachments at lighter gages and welding of the heavier gages
¨ Typical Story Heights: § Levels 2 – 6 = 10 ’ -8 ” § Level 7 = 12 ’ -0 ” § Level 8 = 13 ’ -1 1/8 ” (Setback) ¨ Maximum Loads per Stud: § Interior Bearing = 17.2 K § Exterior Bearing = 10.7 K (typ.) = 12.9 K (Brick) § Exterior Non-Bearing = 1.9 K (typ.) = 5.7 K (Brick) ¨ Studs had to be designed for eccentricity of joists framing into the sides
Courtesy of: Wall-Tech, Inc .
¨ X-Braced: § Straps vary from 4 ” x 16 ga. to 10 ” x 12 ga. § Posts vary from HSS 6x6x3/16 @ 2-3, Dbl. S300 ’ s @ 4-6 & Single S250 ’ s @ 7-8 § Welded Ear Plates @ 1 st , Dbl. Angles @ 2-6, Single Angles @ 7-8 § ¾ ” , 7/8 ” & 1 ” Diam. Bolts (A325 & A490)
¨ Balconies § CFS Posts at corners – 68 & 97 mil § Inset at South Elevation § Hanging at North Elevation § Off-Set Shelf-Angles and knife plates (by EOR) to allow veneer to by-pass § C6 “ Drop-In ” Balcony Frames field bolted § Loads to posts provided by EOR
¨ Brick Relief § 7x6x3/8 Angle welded to CFS at window head ht. § Studs and headers designed for brick support
¨ Shear Wall Transfer at Podium § Embed Plates in PCC Deck for CFS Shear Walls § PCC Elevator Shear Walls stop at Podium Level § PCC Transfer Beams
Recommend
More recommend
