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Traci Peterson Structural Option Outline of Presentation Senior Thesis Presentation The Del Monte Center at The North Shore Project overview Depth Study Redesign of lateral system Architecture Breadth Study Construction

  1. Traci Peterson Structural Option Outline of Presentation Senior Thesis Presentation The Del Monte Center at The North Shore � Project overview � Depth Study ˘ Redesign of lateral system � Architecture � Breadth Study ˘ Construction management ˘ Mechanical � Conclusions The Pennsylvania State University Department of Architectural Engineering Spring 2005 Project Overview Pittsburgh’s North Shore Location of Building The Del Monte Center at The North Shore 375 North Shore Drive, Pittsburgh, PA Project Overview Project Overview � Building Statistics � Project Team ˘ Dates of Construction ˘ Continental/Nationwide Realty Investors ˘ Occupancy/Function ˘ Strada ˘ Size ˘ Continental Building Systems ˘ Cost ˘ Atlantic Engineering Services ˘ Allen & Shariff Corporation ˘ Limbach Facility services 1

  2. Project Overview Project Overview � Structural System ˘ Frame ˘ Foundation ˘ Floor System 1˜ expansion joint Project Overview Project Overview � Bracing (East−West Direction) � Lateral System ˘ Bracing (North−South Direction): Frame E Frame E Location of Bracing: Frame D Frame D Frames A & D Frames B & E Frames C & F Depth Study Depth Study � Lateral System Redesign � Design Criteria ˘ Alternative #1 ˘ Codes ˘ Alternative #2 ˘ Methods � Exposed bracing � Modified windows 2

  3. Depth Study Depth Study � Loads � STAAD.pro 2002 � Load combinations ˘ Dead ˘ ˆSelect Optimized˜ command ˘ 1.4D ˘ Live ˘ 1.2D+1.6L+0.5S ˘ Snow ˘ 1.2D+1.6S+(0.5L or 0.8W) ˘ Wind ˘ 1.2D+1.6W+0.5L+0.5S ˘ Seismic Depth Study Depth Study � Existing System � Alternative #1− Moment Frames Frames A & D Frames B & E Frames C & F Frames A & D Frames B & E Frames C & F Total Weight of System = 426.7 k Total Weight of System = 358.5 k Depth Study Depth Study � Alternative #2− Full Bay Bracing � Alternative #1− Moment Frames ˘ Drift Frames A & D Frames B & E Frames C & F Total Weight of System = 200.8 k 3

  4. Depth Study Architecture � Results � Alternative #2− chevrons ˘ Exposed Bracing system total weight (kips) ˘ Modified Windows existing 462.7 Alternative #1 358.5 (moment frames) Alternative #2 200.8 (chevrons) Architecture Architecture � Alternative #2 with exposed bracing � Alternative #2 with modified windows Breadth Study Breadth Study � Construction Management � Construction Management ˘ Existing beam to column connections � Given: Cost of Structural Steel W−shapes: ˘ Bolted double angle ˘ ASTM A325 ¾˜ Ø slip−critical bolts material erection total ˘ Designed for summation of: » ½ uniform load capacity of member Existing $121,621.47 $20,739.04 $142,360.51 » 10k axial force system � Determined: Alternative #1 $102,165.09 $12,194 $114,359.09 ˘ ¼˜ angle ˘ 5 rows of bolts Alternative #2 $57,228.57 $25,452.56 $82,681.13 ˘ $63 each 4

  5. Breadth Study Breadth Study � Construction Management � Construction Management ˘ Moment connections ˘ Existing bracing connections � Determined: � Given: ˘ Single−plate web connection: ˘ Bolted/welded shear end−plate connections » 3/8˜ x 12˜ ˘ Fillet welds » 5 7/8˜ Ø bolts » 2 5/16˜ fillet welds � Determined: ˘ Tension flange−plate: ˘ 3/16˜ weld » 1˜ x 10−1/4˜ » 5/16˜ fillet welds (6˜ along each side, 10−1/4˜ along end) ˘ 2 rows of bolts ˘ Compression flange−plate: ˘ $55 each » 13/16˜ x 12.5˜ » 5/16˜ fillet weld (6˜ along each side) ˘ No doublers or stiffeners required ˘ $250 each Breadth Study Breadth Study � Construction Management � Construction Management ˘ Alternative #2, with modified windows Total Cost of Connections (material, fabrication, & installation): Building Envelope Costs (as compared to existing design): Existing $20,000 brick + $52,400.26 System stone + $86,686.21 Alternative #1 $28,000 glass − $127,989.76 Alternative #2 $19,000 total + $11,096.71 Breadth Study Breadth Study � Construction Management � Mechanical ˘ Carrier’s ˆHourly Analysis Program 4.2˜ (HAP) Total Costs: � Mechanical system components Existing ˘ 10 packaged water−cooled air conditioning units $162,361 System ˘ 2 cooling towers (1 for each unit) ˘ 3 hydronic unit heaters Alternative #1 $142,359 ˘ 2 hydronic cabinet unit heaters Alternative #2 ˘ 1 electric unit heater $101,681 ˘ 4 hot water boilers (with bracing exposed) � Current utility rates Alternative #2 ˘ Department of Energy’s website $112,780 (with modified windows) 5

  6. Breadth Study Conclusions Total Costs: � Mechanical Existing $162,361 ˘ Results of HAP analysis: System � Annual energy costs savings = $2,856 Alternative #1 $142,359 Alternative #2 $101,681 (with bracing exposed) Alternative #2 $112,780 (with modified windows) $112,780 − $101,681 = $11,000 $11,000 / ($2,856/year) = 4 years Conclusions � Existing system is most expensive system studied � Least expensive system to build has chevron braces left exposed Thank You � Least expensive system over time has concealed chevron braces � Modifying windows disrupts architectural aesthetics of building � Moment frame system costs less than existing system, & preserves large windows � For moment frame system, recommendation is to increase expansion joint to 2˜ 6

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