CONTENTS TITLE PAGE PREFACE CHAPTER 1. PROJECT DESCRIPTION 1 1.1 INTRODUCTION AND BACKGROUND .. 1 1.2 PROJECT ORGANIZATION .. 2 1.3 BUILDINGS SELECTED FOR REDESIGN .. 3 1.4 THE ATC-2 PROJECT.. 4 1.5 NOTATION .. 5 CHAPTER 2. REDESIGN OF BUILDING NO. 2-A 19 STORY STEEL BUILDING .. 7 2.1 GENERAL DESCRIPTION .. 7 UBC 82 Design 7 ATC-3-06 Design 7 2.2 COMPUTER PROGRAM AND MODELING .. 16 2.3 DESIGN TO COMPLY WITH 1982 UBC REQUIREMENTS .. 18 Vertical Load 18 Seismic Load and Load Combinations.. 23 Discussion of Design .. 26 2.4 DESIGN TO COMPLY WITH ATC-3-06 PROVISIONS 27 Vertical Load 27 Seismic Load and Load Combination .. 27 Discussion of the ATC-3-06 Design . . . . . . . . . 31 2.5 COMPARISON OF THE ATC-3-06 AND 1982 UBC DESIGNS . . 33 Comparison of Quantities .. 33 CHAPTER 3.REDESIGN OF BUILDING NO. 3-A 10 STORY REINFORCED CONCRETE BUILDING . 37 3.1 DESCRIPTION . 37 3.2 DESIGN TO COMPLY WITH 1982 UBC REQUIREMENTS . . . 37 Transverse Beams 43 Longitudinal Interior Girders . 43 Longitudinal Exterior Girders . 43 Transverse Shear Walls .. 44 Interior Columns 44 Exterior Columns 44 Joint Cores . 44 3.3MODIFICATIONS OF 1982 UBC DESIGN TO COMPLY WITH ATC-3-06 PROVISIONS .. 44 Transverse Beams 58 Longitudinal Interior Girders . 58 Longitudinal Exterior Girders . 58 Transverse Shear Walls .. 60 Interior Columns 60 Exterior Columns 61 Joint Cores . 62 3.4DISCUSSIONS OF MODIFICATIONS TO COMPLY WITH ATC-3-06 PROVISIONS .. 62 Ill TABLE OF CONTENTS (CONTINUED) TITLE PAGE CHAPTER 4.REDESIGN OF BUILDING NO. 8-A 9 STORY REINFORCED CONCRETE BUILDING . 4.1GENERAL DESCRIPTION .. 4.2DESIGN TO COMPLY WITH 1982 REQUIREMENTS 4.3DESIGN TO COMPLY WITH ATC-3-06 PROVISIONS 4.4COMPARISON OF THE ATC-3-06 AND 1982 UBC DESIGNS. . 4.5DISCUSSION OF THE DESIGNS CHAPTER 5. FINDINGS, CONCLUSIONS AND RECOMMENDATIONS . 5.1INTRODUCTION TO THE CONCLUSIONS .. 5.2SUMMARY OF THE RESULTS FOR BUILDING NUMBER 2 . . 5.3SUMMARY OF THE RESULTS FOR BUILDING NUMBER 3 . . 5.4SUMMARY OF THE RESULTS FOR BUILDING NUMBER 8 . . 5.5OVERALL EVALUATION .. 5.6RECOMMENDATIONS FOR MODIFICATION OF THE TENTATIVE PROVISIONS .. 5.7RECOMMENDATIONS TO CODE IMPLEMENTING BODIES . . 5.8AFTERWORD . REFERENCES .. APPENDIX A PROJECT PARTICIPANTS APPENDIX B APPLIED TECHNOLOGY COUNCIL PROJECTS AND REPORT INFORMATIONTables Table 1: Existing Building Periods, Building No. 2. Table 2: Tons of Steel Used in Different Designs of Building No. 2 . Table 3: Total Cost Comparisons for Different Designs for Building No. 2 .. Table 4: ATC-3-06 Longitudinal Seismic Forces, Building No. 3 . . Table 5: ATC-3-06 Transverse Seismic Forces, Building No. 3 . . Table 6: Longitudinal Story Drift Compliance with ATC-3-06 Provisions, Building No. 3 . Table 7: Transverse Story Drift Compliance with ATC-3-06 Provisions, Building No. 3 . Table 8: Longitudinal Drift Including Soil-Structure-Interaction Effects, Building No. 3 . Table 9: Transverse Drift Including Soil-Structure-Interaction Effects, Building No. 3 TABLE OF CONTENTS (CONTINUED) TITLE Table 10: Longitudinal Stability Coefficients, Building No. 3 . Table 11: Transverse Stability Coefficients, Building No. 3 . Table 12: ATC-3-06 vs 1982 UBC Seismic Story Forces, Building No. 3.. Table 13: 1982 UBC Base Shear Computation, Building No. 8 . Table 14: Forces and Shears, Building No. 8. Table 15: Diaphragm Reinforcing, Building No. 8 Table 16: Story Drifts, Building No. 8 .. Table 17: ATC-3-06 Base Shear Computations, Building No. 8 . Table 18: Period Calculations for Building No. 8 Table 19: Comparison of Equivalent Lateral Forces for Different Analytical Methods, Building No. 8 . Figures Figure 1: Building No. 2 Plan . Figure 2:Typical Tower Floor Framing Plan, Building No. 2. Figure 3:1982 UBC Tower Seismic Resisting System, Building No. 2.. Figure 4:Exterior Moment Frame Elevation (Grid Lines B & E), Building No. 2 . Figure 5:Interior Moment Frame Elevation (Grid Lines C & D), Building No. 2 . Figure 6:X-Braced and Moment-Frame Elevations (Grid Lines 3, 5, 7, 10, 13), Building No. 2 .. Figure 7:ATC-3-06 Tower Seismic Resisting System, Building No. 2.. Figure 8:Added Moment Frame Elevations (Grid Lines 1, 2, 14, & 15) (Added X-Braced: Grid Lines 2 & 14 only), Building No. 2 TABLE OF CONTENTS (CONTINUED) TITLE Figure 10: 1982 UBC Drift/Story Height Ratios for Critical Frames, Building No. 2 Figure 11: ATC-3-06 Drift of Critical Frames, Building No. 2 . . . Figure 12: ATC-3-06 Drift/Story Height Ratios for Critical Frames, Building No. 2 Figure 13: Typical Floor Plan, (2nd thru 10th Floor), Building No. 3 Figure 14: Transverse Section, Building No. 3 .. Figure 15: Section @. Interior Column and Girder (Typical), Building No. 3 Figure 16: Exterior Column Elevation, Building No. 3 . Figure 17: 1982 UBC Seismic Base Shear Calculations, Building No. 3 Figure 18: ATC-3-06 Seismic Base Shear Calculations, Building No. 3 . Figure 19: Soil-Structure Interaction Calculations, Building No. 3. Figure 20: Building No. 8 Plans .. Figure 21: West Structural Elevation at Grid Line 3, Building No. 8. Figure 22: East Structural Elevation at Grid Line 15, Building No. 8 . Figure 23: East Structural Elevation at Grid Line 11, Building No. 8 , Figure 24: South Structural Elevation at Grid Line A, Building No. 8 . Figure 25: South Structural Elevation at Grid Line A, Building No. 8 , Figure 26A: Partial Frame Elevations, Building No. 8. Figure 26B: Typical Ductile Frame Joint Reinforcement, Building No. 8 Figure 27: Frame Reinforcing, Building No. 8 .. Figure 28: Typical Longitudinal Beam-Column/Frame Joints, Building No. 8