Outline. Introduction. Structural Redesign Gravity System Floor System Lateral System Weight Comparison Seismic Comparison

Transcription

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2 Outline Breadth Conclusions, Acknowledgements, Questions & Comments

3 Breadth

4 Breadth Location: Wilmington Delaware Owned and managed by: Pettinaro Real Estate Development Company Delivery Method: Design-Bid-Build Construction Time: November 2006 May 2008 Cost: $11.5 Million

5 Breadth Occupancy: Upscale Residential Apartment Building (89 Units) Size: 180,000 Square Feet Stories: 7 Stories above grade 1 Story partially below grade Major Building Codes: IBC and amendments adopted by New Castle County (DE)

6 Breadth

7 Breadth : 3000 psf allowable soil bearing capacity 3000 psi concrete spread footings 4 inch thick slab on grade 3500 psi concrete On 4 inches of crushed stone 6x6 W1.4xW1.4 WWF

8 Breadth : Precast Hollow Core Plank Rest on 3 inch bearing plate on CMU bond beam Tied in with #4 reinforcing bars spaced at 48 inches

9 Breadth : 8 inch CMU Decorative CMU on exterior walls #4 reinforcing bars spaced at 32 or 48 inches (depending on level) in grouted cells Window and door openings supported by precast lintels

10 Breadth : 8 inch CMU walls Reinforced cells grouted solid all the way down to foundation Reinforced according to level and load

11 Breadth Proposal and Problem Statement

12 Breadth Problem Statement: Large building self-weight design controlled by seismic force Level Dead Loads Roof Ground Total Dead Load

13 Breadth Proposed Solution: Reduce building self-weight Redesign entire structural system using the Infinity Structural System Reduce seismic load

14 Breadth : Green roof Rainwater collection

15 Breadth :

16 Breadth : Ground floor structural system would remain similar to existing Pre-panelized metal stud wall system Additional walls added due to alternative floor system considerations Studs sized according to manufacturer specs Level Floor Height Total Load per Stud(s) (kips) Stud Spacing (in) Stud Type Roof S ksi S ksi S ksi S ksi S ksi (2) 600S ksi (2) 600S ksi Ground

17 Breadth Ground Level Layout Typical Level Layout

18 Breadth : Slab on deck system 4 inch total system depth Epicore MSR 20 gage composite deck Dovetail shaped composite decking flutes provides sufficient reinforcement across spans without need for reinforcing bar 4000 psi concrete

19 Breadth : #4 reinforcing bars spaced at 8 inches over supports 6x6-W1.4xW1.4 WWF Slab and deck sized from Epicore MSR catalog Beams and columns sized in RAM Structural System program

20 Breadth : Interior partition walls reassigned as load bearing

21 Breadth : Infinity Shear Panels (ISP) ¾ inch round threaded grade 55 steel rods 10 ft wide panels Thru-bolted assembly from level to level for continuously braced lateral system Rods inside wall, no surface bulging Metal stud size and spacing match gravity system

22 Breadth : Shear wall layout

23 Breadth : Level Dead Loads Roof Ground Total Dead Load Existing Weight Level Dead Loads Roof Ground Total Dead Load Redesigned Weight (including wet green roof deal load) Self weight Comparisons Existing 14, Kips Redesigned 8, Kips Difference -6, Kips Percent Reduction 41% Reduction

24 Breadth Level : Fx (Kips) Vx (Kips) Overturning Moment (ft-k) Roof Ground Total Overturning Moment= Existing Seismic Level Fx Overturning Vx (Kips) (Kips) Moment (ft-k) Roof Ground Total Overturning Moment= Redesigned Seismic s Existing Kips Redesigned Kips Difference Kips Percent Reduction Existing Seismic Redesigned Seismic 38% Reduction

25 Breadth Breadth Topic:

26 Breadth : Quantity Description Ext. Mat. O&P Ext. Labor O&P Ext. Equip. O&P Ext. Total O&P 1130 SFCA C.I.P. concrete forms C.Y. 480 C.Y. Structural concrete, 3000 psi Structural concrete, 4000 PSI Ea. Concrete block S.F. Precast slab Ton 7.7 Lb C.S.F. Reinforcing steel #4 to #7, footings Reinforcing steel, #3 to #7, floors, walls Welded wire fabric 6 x 6 - W1.4 x W L.F. Concrete block, lintel Total $ $ $ $1,687, Existing Structural Costs Quantity Description Ext. Mat. O&P Ext. Labor O&P Ext. Equip. O&P Ext. Total O&P Structural concrete, 4200 C.Y psi SFCA concrete forms L.F. Metal studs C.S.F. Welded wire fabric 6 x 6 - W1.4 x W Ton Reinforcing steel, footings, #4 to # S.F. Metal decking L.F. W8x L.F. W18x L.F. W12x L.F. W16x L.F. W16x L.F. W18x C.Y. Structural concrete, 4000 PSI L.F. W10x L.F. W12x Ton Reinforcing steel, #7 to # Total $ $ $ $2,000, Redesigned Structural Costs Structural s Existing $1,687, Redesigned $2,000, Difference +$313, Percent Difference 19% Increase

27 Breadth : Existing Structural Construction Time Redesigned Structural Construction Time Structural Construction Time Comparison Existing 192 Days Redesigned 156 Days Difference -36 Days Percent Difference 19% Reduction

28 Breadth Conclusions: Advantages: -Successfully reduced weight and -Seismic forces Disadvantages: -Partition walls must be reassigned as load bearing -Columns placed in open areas Conclusions: Breadth Advantages: -Faster construction time Disadvantages: -Greater cost of construction

29 Breadth Acknowledgments Baker, Ingram, and Associates: Larry Baker Tom Woods Mary Longenecker Infinity Structures: Jeffrey Hundley Abel Consulting Engineers: Brian Abel Nate Boczkowski Pettinaro : William Netta The Pennsylvania State University : Professor M. Kevin Parfitt Dr. Richard Behr Professor Robert Holland A special thank you to my family, friends, and classmates for their continued and ongoing support

30 Breadth Questions & Comments