1100 BROADWAY, OAKLAND, CA Sonja Hinish Structural Option Integrated BAE/MAE Program Advisor: Dr. Linda Hanagan Senior Thesis Final Presentation April 14, 2008 PRESENTATION OUTLINE Introduction Existing Conditions Proposal Project Goals Structural System Redesign Gravity System Lateral System Impact on Foundations Lateral Analysis Wind Seismic Breadth Studies Overall Summary and Conclusions PRESENTATION OUTLINE Introduction Existing Conditions Proposal Project Goals Structural System Redesign Gravity System Lateral System Impact on Foundations Lateral Analysis Wind Seismic Breadth Studies Overall Summary and Conclusions INTRODUCTION TO 1100 BROADWAY PRESENTATION OUTLINE INTRODUCTION Introduction Existing Conditions Proposal Project Goals Structural System Redesign Gravity System Lateral System Impact on Foundations Lateral Analysis Wind Seismic Breadth Studies Overall Summary and Conclusions Owner: Architect: Structural Engineer: SKS Investments, San Francisco, CA Kaplan McLaughlin Diaz Architects, San Francisco, CA Simpson Gumpertz & Heger, Inc., San Francisco, CA PRESENTATION OUTLINE INTRODUCTION Introduction Existing Conditions Proposal Project Goals Structural System Redesign Gravity System Lateral System Impact on Foundations Lateral Analysis Wind Seismic Key System Building portion Breadth Studies Overall Summary and Conclusions Architecture New high-rise tower combined with the adaptive reuse of the Key System building facade PRESENTATION OUTLINE INTRODUCTION Introduction Existing Conditions Proposal Project Goals Structural System Redesign Gravity System Lateral System Impact on Foundations Lateral Analysis Wind Seismic Breadth Studies Overall Summary and Conclusions Architecture New high-rise tower combined with the adaptive reuse of the Key System building facade PRESENTATION OUTLINE Introduction Existing Conditions Proposal Project Goals Structural System Redesign Gravity System Lateral System Impact on Foundations Lateral Analysis Wind Seismic Breadth Studies Overall Summary and Conclusions INTRODUCTION Architecture LEED Gold rating Transit Oriented Development (TOD) Photovoltaic solar panels, green roof, and a rainwater collection, filtration and reuse system PRESENTATION OUTLINE Introduction Existing Conditions Proposal Project Goals Structural System Redesign Gravity System Lateral System Impact on Foundations Lateral Analysis Wind Seismic Breadth Studies Overall Summary and Conclusions EXISTING CONDITIONS PRESENTATION OUTLINE EXISTING CONDITIONS Introduction Existing Conditions Proposal Project Goals Structural System Redesign W e s t E l e v a t i o n Gravity System Lateral System Impact on Foundations Lateral Analysis Wind Seismic Breadth Studies Overall Summary and Conclusions N o r t h E l e v a t i o n Existing Structural System Gravity system: 3¼” light weight concrete fill on a 3” composite steel deck supported by composite steel beams Lateral system: Dual system composed of steel special concentric braced frames and special moment resisting frames Foundations: Prestressed, precast concrete piles beneath a 5’-9” thick reinforced concrete mat foundation Remaining portion of the foundation is a 9” thick reinforced concrete slab PRESENTATION OUTLINE EXISTING CONDITIONS Existing frames resisting forces in E/W direction Introduction Existing Conditions Proposal Project Goals Structural System Redesign Frame 1 Frame 2 Gravity System Lateral System Impact on Foundations Frame 4 Lateral Analysis Frame 3 Wind Seismic Frame 5 Breadth Studies Overall Summary and Conclusions Frame 6 N Frame 1 Frame 2 Frame 3 Frame 4 Frame 5 Frame 6 Frame 7 Frame 7 PRESENTATION OUTLINE EXISTING CONDITIONS Existing frames resisting forces in N/S direction Introduction Existing Conditions Proposal Project Goals Structural System Redesign Gravity System Lateral System Impact on Foundations Wind Seismic Frame D Frame C Lateral Analysis Frame B Frame A Breadth Studies Overall Summary and Conclusions N Frame A Frame B Frame C Frame D PRESENTATION OUTLINE Introduction Existing Conditions Proposal Project Goals Structural System Redesign Gravity System Lateral System Impact on Foundations Lateral Analysis Wind Seismic Breadth Studies Overall Summary and Conclusions PROPOSAL PRESENTATION OUTLINE Introduction Existing Conditions Proposal Project Goals Structural System Redesign Gravity System Lateral System Impact on Foundations PROPOSAL Drawbacks of existing system: Deflections Depth Lateral Analysis Wind Seismic Breadth Studies Overall Summary and Conclusions Proposed Design Gravity System: One way mild-steel reinforced concrete slab with post-tensioned concrete beams Why: Lateral System: Bays exhibit one-way behavior Limited Deflections Location of openings not critical Concrete shear walls PRESENTATION OUTLINE Introduction Existing Conditions Proposal Project Goals Structural System Redesign Gravity System Lateral System Impact on Foundations Lateral Analysis Wind Seismic Breadth Studies Overall Summary and Conclusions PROJECT GOALS PRESENTATION OUTLINE Introduction Existing Conditions Proposal Project Goals Structural System Redesign PROJECT GOALS ” Reduce total floor system depth 30.25 Gravity System Lateral System Impact on Foundations Lateral Analysis Wind Seismic Breadth Studies Overall Summary and Conclusions Become more familiar with the design of posttensioned systems Columbus Oakland Building Relocation PRESENTATION OUTLINE Introduction Existing Conditions Proposal Project Goals Structural System Redesign Gravity System Lateral System Impact on Foundations Lateral Analysis Wind Seismic Breadth Studies Overall Summary and Conclusions STRUCTURAL SYSTEM REDESIGN PRESENTATION OUTLINE Introduction Existing Conditions Proposal Project Goals Structural System Redesign Gravity System Lateral System Impact on Foundations Lateral Analysis Wind Seismic Breadth Studies Overall Summary and Conclusions STRUCTURAL SYSTEM REDESIGN One-way slab design Minimum slab thickness (h) according to ACI Span 1-2 2-3 3-4 4-5 5-6 6-7 7-10 10-12 Length (ft) 27.33 31 20 20 20 27.33 20.95 28.7 h min l/24 l/28 l/28 l/28 l/28 l/28 l/38 l/24 h min (in) 13.7 13.3 8.6 8.6 8.6 11.8 9.0 14.4 PRESENTATION OUTLINE Introduction Existing Conditions Proposal Project Goals Structural System Redesign STRUCTURAL SYSTEM REDESIGN One-way slab design Slab deflections from PCA Slab Gravity System Lateral System Impact on Foundations Lateral Analysis Wind Seismic Breadth Studies Overall Summary and Conclusions Long-term deflection Check Span 1-2 2-3 3-4 4-5 5-6 6-7 7-10 10-12 Length (ft) 27.33 31 20 20 20 27.33 20.95 28.7 Deflections from PCA Slab LL ∆ (in) DL ∆ (in) 0.062 0.088 0.102 0.149 0.067 0.084 0.083 0.11 Long-term deflection LL ∆ + 3DL ∆ (in) 0.326 0.549 0.319 0.413 Allowable ∆ l/240 1.4 1.6 1.4 1.5 PRESENTATION OUTLINE Introduction Existing Conditions Proposal Project Goals Structural System Redesign Gravity System Lateral System Impact on Foundations Lateral Analysis Wind Seismic Breadth Studies Overall Summary and Conclusions STRUCTURAL SYSTEM REDESIGN One-way slab design Final Slab Design: f’c=5000 psi Reinforcing steel: 60 ksi, #5 bars top and bottom PRESENTATION OUTLINE Introduction Existing Conditions Proposal Project Goals Structural System Redesign Gravity System Lateral System Impact on Foundations Lateral Analysis Wind Seismic Breadth Studies Overall Summary and Conclusions STRUCTURAL SYSTEM REDESIGN Post-tensioned beam design Preliminary Design: Trial beam size of l/22 : Using 37’ span amounted to a depth of 20” ½” diameter unbonded tendons f’c=5000psi Precompression limits (P/A): ACI minimum of 125 psi, 200-400 psi typical for beams Targeted load balance of 70-80% of the dead load Class T Analyzed as T sections for interior beams and L sections for perimeter beams Mild steel: #4 shear and #8 for top and bottom PRESENTATION OUTLINE Introduction Existing Conditions Proposal Project Goals Structural System Redesign Gravity System Lateral System Impact on Foundations Lateral Analysis Wind Seismic Breadth Studies Overall Summary and Conclusions STRUCTURAL SYSTEM REDESIGN Post-tensioned beam design Beam layout PRESENTATION OUTLINE Introduction Existing Conditions Proposal Project Goals Structural System Redesign Gravity System Lateral System Impact on Foundations Lateral Analysis Wind Seismic Breadth Studies Overall Summary and Conclusions STRUCTURAL SYSTEM REDESIGN Post-tensioned beam design Tendon layout PRESENTATION OUTLINE Gravity System Lateral System Impact on Foundations Preliminary thickness = 18” Reinforcing: 2 rows of #5 bars at 10” O.C North Lateral Analysis Shear wall layout Wind Seismic Breadth Studies Overall Summary and Conclusions Wall B Wall C Wall 5 Shear Wall Design Wall 4 Introduction Existing Conditions Proposal Project Goals Structural System Redesign Wall 3 STRUCTURAL SYSTEM REDESIGN PRESENTATION OUTLINE Introduction Existing Conditions Proposal Project Goals Structural System Redesign Gravity System Lateral System Impact on Foundations For a typical floor: Level 10-Roof 1.4D PIER 1 axial load Wall (k) 3 226 4 5 B 59 C 58.5 Pier 1 Pier 2 Wind Seismic Breadth Studies Overall Summary and Conclusions total 343.5 For a typical floor: Level 4-9 1.4D PIER 1 axial load Wall (k) 3 199 4 5 B 70.5 C 52.25 Lateral Analysis STRUCTURAL SYSTEM REDESIGN total Mu (y-axis) ft-k 23809 Mu (y-axis) ft-k 23809 Pier 1 Mu (x-axis) ft-k 49211 Pier 2 Mu (x-axis) ft-k 85367 321.75 PIER 2 axial load (k) 30 129 164 167.5 490.5 PIER 2 axial load (k) 86.8 115 211.5 156.75 570.05 Shear walls supporting Level 4 support 18 floors: total axial (k) 6053 9306 Wal l 3 4 5 B C tota l Wal l 3 4 5 B C tota l 1.2D+1.6L+0.5Lr PIER 1 PIER 2 axial load axial load (k) (k) 324 14.8 190 92.5 250.5 89.5 254.5 506 709.8 1.2D+1.6L+0.5Lr PIER 1 PIER 2 axial load axial load (k) (k) 277 110 165 82.75 248.25 80.75 242.25 440.5 8715 765.5 13111 PRESENTATION OUTLINE STRUCTURAL SYSTEM REDESIGN Introduction Existing Conditions Proposal Project Goals Structural System Redesign Gravity System Lateral System Impact on Foundations Lateral Analysis Wind Seismic Breadth Studies Overall Summary and Conclusions Wall 3 Wall 4 Wall 5 Wall B Wall C PRESENTATION OUTLINE STRUCTURAL SYSTEM REDESIGN Impact on Foundations Introduction Existing Conditions Proposal Project Goals Structural System Redesign Ultimate load per floor to each column (k) Column # Gravity System Lateral System Impact on Foundations Lateral Analysis Wind Seismic Breadth Studies Overall Summary and Conclusions Ultimate load per floor to each column (k) Column # 6 7 16 17 20 Level 2 57.4 186 137 14.5 Levels 3-8 249 265 228 224 184 Level 9 242 266 230 223 197 Levels 10-Roof 245 264 233 233 118 21 124 269 285 185 Total load on each column (k) Shear wall 4733.4 5210 4394 4500 2731.5 3 4 5 B C Weight (k) 1744.88 1744.88 1744.88 2326.50 2326.50 1 2 3 4 5 8 9 10 11 12 13 14 15 18 19 22 23 24 25 26 27 28 29 30 Level 2 91 112 143 118 107 102 111 81.4 Levels 3-8 88.1 161 158 84.9 127 151 134 148 116 113 111 115 87.4 131 111 118 156 198 217 193 107 93.1 109 114 Level 9 66.6 151 158 84.2 130 152 136 150 115 111 111 114 87.4 131 120 115 188 236 252 191 123 106 122 135 Levels 10-Roof 68.2 133 156 79.3 192 152 137 148 115 114 113 115 109 133 88.5 91.4 Total load on each column (k) # of piles required to support column for concrete system 1413.6 2713 3069 1657.2 3196 3025 2584 2932 2191 2264 2133 2286 1919.8 2624 1848 2001.2 1124 1424 1554 1349 765 664.6 776 819 4243 Total load to be supported by mat foundation (k) 35700 # Piles required under mat foundation for concrete system 145 # Piles supporting mat foundation for original design 121 Increase in # of piles required to support mat foundation= 19.8% Average increase in # of piles required to support each column= 33.4% 6 12 13 7 13 13 11 12 9 10 9 10 8 11 8 9 5 6 7 6 4 3 4 4 # of piles in original design 6 8 8 8 8 14 8 8 6 8 8 6 6 8 % Increase in piles required 0.0% 50.0% 62.5% -12.5% 62.5% -7.1% 37.5% 50.0% 50.0% 25.0% 12.5% 66.7% 33.3% 37.5% Columns 19-30 support the Key System portion of the structure and not enough information is available from the original design to compare with the new concrete system PRESENTATION OUTLINE Introduction Existing Conditions Proposal Project Goals Structural System Redesign Gravity System Lateral System Impact on Foundations Lateral Analysis Wind Seismic Breadth Studies Overall Summary and Conclusions LATERAL ANALYSIS PRESENTATION OUTLINE Introduction Existing Conditions Proposal Project Goals Structural System Redesign Gravity System Lateral System Impact on Foundations Lateral Analysis Wind Seismic Breadth Studies Overall Summary and Conclusions LATERAL ANALYSIS Wind Story forces x-direction (E/W) Story forces y-direction (N/S) PRESENTATION OUTLINE Introduction Existing Conditions Proposal Project Goals Structural System Redesign Gravity System Lateral System Impact on Foundations Lateral Analysis Wind Seismic Breadth Studies Overall Summary and Conclusions LATERAL ANALYSIS Wind Height Floor to Level (ft) Floor H (ft) Allow. drift (in) Roof 258.50 13.00 20 245.50 13.00 19 232.50 13.00 18 219.50 13.00 17 206.50 13.00 16 193.50 13.00 15 180.50 13.00 14 167.50 13.00 13 154.50 13.00 12 141.50 13.00 11 128.50 13.00 10 115.50 13.00 9 102.50 13.00 8 89.50 13.00 7 76.50 13.00 6 63.50 13.00 5 50.50 13.00 4 37.50 13.00 3 24.50 12.50 2 12.00 12.00 disp. WX (in) disp. WY (in) 7.755 7.365 6.975 6.585 6.195 5.805 5.415 5.025 4.635 4.245 3.855 3.465 3.075 2.685 2.295 1.905 1.515 1.125 0.735 1.416 1.336 1.255 1.173 1.091 1.007 0.922 0.837 0.752 0.667 0.584 0.502 0.421 0.345 0.272 0.203 0.141 0.087 0.041 4.916 4.695 4.470 4.240 4.004 3.761 3.512 3.257 2.997 2.733 2.465 2.196 1.931 1.601 1.268 0.942 0.631 0.350 0.117 0.360 0.014 0.039 Allowable Drift: h/400 PRESENTATION OUTLINE Introduction Existing Conditions Proposal Project Goals Structural System Redesign Gravity System Lateral System Impact on Foundations Lateral Analysis Wind Seismic Breadth Studies Overall Summary and Conclusions LATERAL ANALYSIS Seismic Seismic forces at each level Allowable Story Drift= 0.02hsx Actual Story Drift=Cd*∆/I Seismic δx δy Height Floor to all. Story x-disp. x-story y-disp. y-story Level (ft) Floor H (ft) drift (in) (in) drift (in) (in) (in) drift (in) (in) Roof 258.50 13.00 3.12 1.694 0.104 0.466 2.029 0.130 0.585 20 245.50 13.00 3.12 1.590 0.105 0.473 1.899 0.130 0.586 19 232.50 13.00 3.12 1.485 0.106 0.478 1.769 0.131 0.590 18 219.50 13.00 3.12 1.379 0.107 0.482 1.638 0.132 0.592 17 206.50 13.00 3.12 1.272 0.108 0.486 1.506 0.132 0.593 16 193.50 13.00 3.12 1.164 0.108 0.486 1.374 0.131 0.590 15 180.50 13.00 3.12 1.056 0.108 0.484 1.243 0.130 0.585 14 167.50 13.00 3.12 0.948 0.106 0.479 1.113 0.128 0.576 13 154.50 13.00 3.12 0.842 0.105 0.470 0.985 0.125 0.563 12 141.50 13.00 3.12 0.737 0.102 0.458 0.860 0.121 0.546 11 128.50 13.00 3.12 0.636 0.098 0.441 0.738 0.117 0.524 10 115.50 13.00 3.12 0.538 0.097 0.438 0.622 -0.017 -0.076 9 102.50 13.00 3.12 0.440 0.087 0.393 0.639 0.125 0.564 8 89.50 13.00 3.12 0.353 0.081 0.365 0.513 0.116 0.524 7 76.50 13.00 3.12 0.272 0.073 0.330 0.397 0.106 0.478 6 63.50 13.00 3.12 0.198 0.065 0.290 0.291 0.094 0.422 5 50.50 13.00 3.12 0.134 0.054 0.244 0.197 0.079 0.355 4 37.50 13.00 3.12 0.080 0.042 0.189 0.118 0.061 0.276 3 24.50 12.50 3 0.038 0.021 0.095 0.057 0.043 0.195 2 12.00 12.00 2.88 0.016 0.016 0.074 0.013 0.013 0.059 Displacement values taken from ETABS Cd 4.5 I 1.0 PRESENTATION OUTLINE Introduction Existing Conditions Proposal Project Goals Structural System Redesign Gravity System Lateral System Impact on Foundations Lateral Analysis Wind Seismic Breadth Studies Overall Summary and Conclusions BREADTH STUDIES PRESENTATION OUTLINE BREADTH STUDIES Introduction Existing Conditions Proposal Project Goals Structural System Redesign Complete Green Roof Design Gravity System Lateral System Impact on Foundations Lateral Analysis Wind Seismic Breadth Studies Overall Summary and Conclusions Architectural Breadth Building Enclosure Breadth PRESENTATION OUTLINE Introduction Existing Conditions Proposal Project Goals Structural System Redesign BREADTH STUDIES Architectural Breadth Goals Impact on structure Zones Gravity System Lateral System Impact on Foundations Lateral Analysis Transition Wind Seismic Breadth Studies Overall Summary and Conclusions Public Semi-public PRESENTATION OUTLINE Introduction Existing Conditions Proposal Project Goals Structural System Redesign Gravity System Lateral System Impact on Foundations Lateral Analysis Wind Seismic Breadth Studies Overall Summary and Conclusions BREADTH STUDIES Final Plan PRESENTATION OUTLINE Introduction Existing Conditions Proposal Project Goals Structural System Redesign Gravity System Lateral System Impact on Foundations Lateral Analysis Wind Seismic Breadth Studies Overall Summary and Conclusions BREADTH STUDIES Planting Plans Japanese Maple (Acer palmatum) image: http://www.dirtdoctor.com Fragrant Sumac (Rhus aromatica) http://www.pottedliners.com PRESENTATION OUTLINE Introduction Existing Conditions Proposal Project Goals Structural System Redesign BREADTH STUDIES Trumpet vine (Campsis radicans) Chive (Allium schoenoprasum) http://www.hramornursery.com http://4.bp.blogspot.com Gravity System Lateral System Impact on Foundations Lateral Analysis Wind Seismic Breadth Studies Overall Summary and Conclusions Nodding Onion (Allium cernuum) http://image02.webshots.com Purple Coneflower (Echinacea purpurea) http://www.springcreekforest.org PRESENTATION OUTLINE Introduction Existing Conditions Proposal Project Goals Structural System Redesign BREADTH STUDIES Black-eyed Susan (Rubeckia hirta) http://images.google.com Butterfly Milkweed (Asclepias tuberosa) http://www.wildflower.org Yarrow (Achillea millefolium) http://media.photobucket.com Gravity System Lateral System Impact on Foundations Lateral Analysis Wind Seismic Breadth Studies Overall Summary and Conclusions Fruitless Mulberry (Morus alba) Wild Pink (Silene carolinian) http://www.francescaowens.com http://images.google.com PRESENTATION OUTLINE Introduction Existing Conditions Proposal Project Goals Structural System Redesign BREADTH STUDIES Hens and chicks (Sempervivum tectorum) Two-row stonecrop (Sedum spurium) http://www.panacheexteriordesign.com http://www.greencolanddesign.com Yellow ice plant (delosperma nubigenum) http://www.francescaowens.com Gravity System Lateral System Impact on Foundations Lateral Analysis Wind Seismic Breadth Studies Overall Summary and Conclusions White Stonecrop (Sedum album) http://www.overthebrink.com Fameflower (Talinum calycinum) http://images.google.com PRESENTATION OUTLINE Introduction Existing Conditions Proposal Project Goals Structural System Redesign Gravity System Lateral System Impact on Foundations Lateral Analysis Wind Seismic Breadth Studies Overall Summary and Conclusions OVERALL SUMMARY & CONCLUSIONS PRESENTATION OUTLINE Introduction Existing Conditions Proposal Project Goals Structural System Redesign Gravity System Lateral System Impact on Foundations Goals: Wind Seismic Breadth Studies Overall Summary and Conclusions Reduced floor system depth by 8.25” Developed a greater understanding for PT design Created a roof garden for building occupants Conclusions: Lateral Analysis OVERALL SUMMARY & CONCLUSIONS Floor system depth reduced, for the 20 story height could add another 13’ story Foundations increased on average by 19-33% due to increased building weight Redesigned for lower loads than existing system Structure supporting green roof needs designed for significantly higher loads Unless limits are placed on depth of the floor system the cost of PT and increased building weight will most likely outweigh advantages of design PRESENTATION OUTLINE Introduction Existing Conditions Proposal Project Goals Structural System Redesign Gravity System Lateral System Impact on Foundations ACKNOWLEDGEMENTS I would like to extend my deepest thanks and appreciation to the following individuals and companies. Simpson Gumpertz & Heger: Anindya Dutta Ronald Hamburger Amy Graver Charlie Russo Holbert Apple Associates: Richard Apple SKS Investments: Steve Shanks The Pennsylvania State University: Dr. Linda Hanagan Robert Holland Kevin Parfitt Lateral Analysis Wind Seismic Breadth Studies Overall Summary and Conclusions