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ICC IBC SEAOC SSDM V3 2018

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2018 IBC SEAOC Structural/Seismic Design Manual Volume 3: Examples for Concrete Buildings

Published By Publication Date Number of Pages
ICC 2018 267
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2018 IBC® SEAOC Structural/Seismic Design Manual, Volume 3: Examples for Concrete Buildings This series provides a step-by-step approach to applying the structural provisions of the 2018 International Building Code® and referenced standards. Volume 3 contains code application examples of concrete construction. Moment frames, braced frames, and shear wall construction are analyzed. Volume 3 details sample structures containing concrete moment frames or shear walls, diaphragm, and pile design, including: Reinforced Concrete Wall Reinforced Concrete Wall with Coupling Beams Reinforced Concrete Special Moment Frame Reinforced Concrete Parking Garage Pile Foundation Pile Foundation at SMRF Design of Concrete Diaphragm and Collector, including Alternate Method for Determining Forces in Accordance with ASCE 7-16 Section 12.10.3 An excellent reference and study guide for the NCEES Structural Exam, this manual is an invaluable resource for civil and structural engineers, architects, academics, and students.

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1 2018 IBC® SEAOC STRUCTURAL/SEISMIC DESIGN MANUAL VOLUME 3 EXAMPLES FOR CONCRETE BUILDINGS
2 2018 IBC® SEAOC STRUCTURAL/SEISMIC DESIGN MANUAL VOLUME 3 EXAMPLES FOR CONCRETE BUILDINGS TITLE PAGE
3 COPYRIGHT
PUBLISHER
EDITOR
DISCLAIMER
4 SUGGESTIONS FOR IMPROVEMENT
ERRATA NOTIFICATION
6 TABLE OF CONTENTS
8 PREFACE TO THE 2018 IBC SEAOC STRUCTURAL/SEISMIC DESIGN MANUAL
10 PREFACE TO VOLUME 3
12 ACKNOWLEDGEMENTS
14 REFERENCES
18 HOW TO USE THIS DOCUMENT
20 DESIGN EXAMPLE 1 REINFORCED CONCRETE WALL
21 1. BUILDING GEOMETRY AND LOADS
1.1 GIVEN INFORMATION
22 FIGURE 1-1 FLOOR PLAN
1.2 DESIGN LOADS AND LATERAL FORCES
23 FIGURE 1-2 WALL ELEVATION, SHEAR, AND MOMENT DIAGRAM
TABLE 1-1 DESIGN LOADS AND LATERAL FORCES
24 2. LOAD COMBINATIONS FOR DESIGN
2.1 LOAD COMBINATIONS
2.2 HORIZONTAL AND VERTICAL COMPONENTS OF EARTHQUAKE FORCE
EQUATION 12.4-1
EQUATION 12.4-2
EQUATION 12.4-3
EQUATION 12.4-4A
25 EQUATION 11.4-1
EQUATION 11.4-3
2.3 ACTIONS AT BASE OF WALL
3. PRELIMINARY SIZING OF WALL
3.1 SHEAR STRESS AND REINFORCEMENT RATIO RULES OF THUMB
26 3.2 MINIMUM THICKNESS TO PREVENT WALL BUCKLING
3.3 LAYOUT OF VERTICAL REINFORCEMENT
FIGURE 1-3 LAYOUT OF VERTICAL REINFORCEMENT AT WALL BASE
27 4. FLEXURAL STRENGTH AT BASE OF WALL
4.1 REINFORCEMENT CONSIDERED “EFFECTIVE”
4.2 ASSUMED REINFORCEMENT STRAIN
FIGURE 1-4 STEEL STRESS AND NEUTRAL AXIS DEPTH
28 4.3 STRENGTH REDUCTION FACTOR
4.4 HAND CALCULATION
29 FIGURE 1-5 FREE-BODY DIAGRAM FOR FLEXURAL STRENGTH
TABLE 1-2 , FIRST INERATION FOR c AND Mn
TABLE 1-3. SECOND ITERATION FOR c AND Mn
30 4.5 SPREADSHEET CALCULATION
31 FIGURE 1-6 GENERAL SPREADSHEET TO CALCULATE FLEXURAL STRENGTH
32 4.6 SOFTWARE CALCULATION
FIGURE 1-7 ANALYSIS OF WALL SECTION BY SP COLUMN
33 5. FLEXURAL STRENGTH AND LAP SPLICES OVER HEIGHT OF WALL
5.1 BAR CUT-OFFS
FIGURE 1-8 WALL ELEVATION
34 TABLE 1-4 BOUNDARY AND VERTICAL WEB REINFORCEMENT
35 FIGURE 1-9 CALCULATION OF REQUIRED FLEXURAL STRENGTH AT BAR CUT-OFF LOCATIONS
5.2 LAP SPLICE LENGTH
36 EQUATION 25.4.2.3A
37 FIGURE 1-10 DETERMINATION OF Atrln FOR CALCULATION OF LAP-SPLICE LENGTH
5.3 SPLICES IN PLASTIC-HINGE REGIONS
39 6. SHEAR STRENGTH OF WALL
6.1 ACI 318 REQUIREMENTS
EQUATION 18.10.4.1
40 TABLE 1-5 HORIZONTAL REINFORCEMENT FOR ACI 318 SHEAR STRENGTH REQUIREMENTS
6.2 SEAOC BLUE BOOK RECOMMENDATIONS
41 TABLE 1-6 FLEXURAL STRENGTH COMPARISON
FIGURE 1-11 RELATIONSHIP OF SHEAR AMPLIFICATION FACTOR TO NUMBER OF STORIES
42 TABLE 1-7 HORIZONTAL REINFORCEMENT BASED ON BLUE BOOK SHEAR DESIGN RECOMMENDATIONS
43 6.3 COMPARISON OF DESIGNS PER ACI AND SEAOC
7. SHEAR FRICTION (SLIDING SHEAR) STRENGTH OF WALL
EQUATION 22.9.4.2
44 8. DETAILING OF WALL BOUNDARY ELEMENTS
8.1 REQUIREMENT FOR SPECIAL BOUNDARY ELEMENTS
EQUATION 18.10.6.2
8.2 DETAILING WHERE SPECIAL BOUNDARY ELEMENTS ARE NOT REQUIRED
45 FIGURE 1-12 BOUNDARY REINFORCEMENT AT WALL BASE
46 DESIGN EXAMPLE 2 REINFORCED CONCRETE WALL WITH COUPLING BEAMS
47 1. BUILDING GEOMETRY AND LOADS
1.1 GIVEN INFORMATION
48 1.2 DESIGN LOADS AND LATERAL FORCES
49 FIGURE 2-1 WALL ELEVATION, PLAN SECTION, AND DESIGN FORCES
50 FIGURE 2-2 RESULTS OF ETABS COMPUTER ANALYSIS (KIPS, INCHES)
51 2. LOAD COMBINATIONS FOR DESIGN
3. PRELIMINARY SIZING OF WALL
4. COUPLING BEAM STRENGTH AND DIAGONAL REINFORCEMENT
4.1 REQUIREMENT FOR DIAGONAL REINFORCEMENT
52 TABLE 2-1 COUPLING BEAM FORCES AND DIAGONAL REINFORCEMENT
4.2 DESIGN OF DIAGONAL REINFORCEMENT
EQUATION 18.10.7.4
53 FIGURE 2-3 GEOMETRY OF COUPLING-BEAM DIAGONAL BARS
54 FIGURE 2-4 DIAGONAL BARS PROVIDED IN COUPLING BEAMS
5. FLEXURAL REINFORCEMENT OF WALL PIERS
5.1 CRITICAL MOMENTS AND AXIAL FORCES
55 TABLE 2-2 DEAD LOAD FROM WALL SELF-WEIGHT
TABLE 2-3 CALCULATION OF FACTORED AXIAL FORCES AND MOMENTS ON CRITICAL WALL PIERS
56 5.2 DESIGN OF VERTICAL REINFORCEMENT
TABLE 2-4 CALCULATION OF φ VALUE FOR SELECTED LOAD CASES
FIGURE 2-5 SECTION THROUGH WALL PIER IN VICINITY OF LINE C
57 FIGURE 2-6 spCOLUMN RESULTS FOR DESIGN OF VERTICAL REINFORCEMENT
58 FIGURE 2-6 (continued) spCOLUMN RESULTS FOR DESIGN OF VERTICAL REINFORCEMENT
59 FIGURE 2-7 ELEVATION SHOWING VERTICAL WALL REINFORCEMENT
5.3 SPLICES OF REINFORCEMENT
60 6. PLASTIC MECHANISM ANALYSIS
6.1 PROBABLE FLEXURAL STRENGTH
61 FIGURE 2-8 spCOLUMN CALCULATION OF PROBABLE FLEXURAL STRENGTH Mpr (fy = 75 ksi, φ = 1.0)
62 FIGURE 2-8 (continued) spCOLUMN CALCULATION OF PROBABLE FLEXURAL STRENGTH Mpr (fy = 75 ksi, φ = 1.0)
63 FIGURE 2-8 (continued) spCOLUMN CALCULATION OF PROBABLE FLEXURAL STRENGTH Mpr (fy = 75 ksi, φ = 1.0)
TABLE 2-5 APPROXIMATE PROBABLE FLEXURAL STRENGTHS OF WALL PIERS FOR PLASTIC ANALYSIS
64 6.2 MECHANISM WITH HINGING AT BASE OF WALL PIERS
65 TABLE 2-6 PLASTIC MECHANISM CALCULATIONS ASSUMING PLASTIC HINGING AT BASE AND IN ALL COUPLING BEAMS
66 FIGURE 2-9 MECHANISM WITH PLASTIC HINGES AT BASE OF WALL
6.3 MECHANISM WITH HINGING AT FOURTH FLOOR
67 TABLE 2-7 PLASTIC MECHANISM CALCULATIONS ASSUMING PLASTIC HINGING AT FOURTH-FLOOR PIERS
68 FIGURE 2-10 MECHANISM WITH PLASTIC HINGES AT FOURTH-FLOOR WALL PIERS
69 TABLE 2-8 PLASTIC MECHANISM CALCULATIONS ASSUMING PLASTIC HINGING AT FOURTH-FLOOR PIERS—REVISED FOR STRONGER PIERS AT FOURTH FLOOR
7. SHEAR REINFORCEMENT OF WALL PIERS
7.1 ACI 318 REQUIREMENTS
EQUATION 18.10.4.1
70 TABLE 2-9 DESIGN FOR SHEAR BY ACI 318
7.2 SEAOC BLUE BOOK RECOMMENDATIONS
71 EQUATION 18.10.4.1
TABLE 2-10 DESIGN FOR SHEAR BY THE BLUE BOOK RECOMMENDATIONS
72 7.3 COMPARISON OF DESIGNS PER ACI AND SEAOC
8. DETAILING OF WALL-PIER BOUNDARY ELEMENTS
8.1 REQUIREMENT FOR SPECIAL BOUNDARY ELEMENTS: STRESS-BASED APPROACH
73 TABLE 2-11 STRESS ANALYSIS FOR SPECIAL BOUNDARY ELEMENT REQUIREMENT BY ACI 318
74 TABLE 2-11 STRESS ANALYSIS FOR SPECIAL BOUNDARY ELEMENT REQUIREMENT BY ACI 318 (continued)
FIGURE 2-11 COMPRESSIVE STRESSES (ksi) AND REQUIRED LOCATIONS OF SPECIAL BOUNDARY ELEMENTS ACCORDING TO ACI 318 SECTION 18.10.6.3
75 8.2 REQUIREMENT FOR SPECIAL BOUNDARY ELEMENTS: NEUTRAL AXIS APPROACH
TABLE 2-12 REQUIREMENT FOR SPECIAL BOUNDARY ELEMENT BY ACI 318 SECTION 18.10.6.2
EQUATION 18.10.6.2
76 FIGURE 2-12 REQUIRED LOCATIONS OF SPECIAL BOUNDARY ELEMENTS ACCORDING TO ACI 318 SECTION 18.10.6
77 8.3 DETAILING OF SPECIAL BOUNDARY ELEMENTS
TABLE 2-13 REQUIRED WIDTH AND VERTICAL EXTENT OF SPECIAL BOUNDARY ELEMENTS
78 FIGURE 2-13 BOUNDARY TIES REQUIRED BY THE ACI 318 PROCEDURE
79 TABLE 2-14 REQUIRED BOUNDARY ZONE TIES BY ACI 318 PROCEDURE
80 8.4 DETAILING WHERE SPECIAL BOUNDARY ELEMENTS ARE NOT REQUIRED
81 9. DETAILING OF COUPLING BEAMS
9.1 DEVELOPMENT LENGTH OF DIAGONAL REINFORCEMENT
9.2 OPTIONS FOR CONFINEMENT OF COUPLING BEAMS
9.3 OPTION 1: TIES AROUND DIAGONAL BARS
82 FIGURE 2-14 SECTION THROUGH COUPLING BEAM SHOWING LAYERING OF REINFORCEMENT
83 EQUATION 18.7.5.3
84 FIGURE 2-15 ELEVATION SHOWING DETAILING OF A COUPLING BEAM
85 9.4 OPTION 2: TIES AROUND ENTIRE BEAM
87 FIGURE 2-16 SECTION THROUGH COUPLING BEAM SHOWING LAYERING OF REINFORCEMENT
88 FIGURE 2-17 ELEVATION SHOWING DETAILING OF A COUPLING BEAM
90 DESIGN EXAMPLE 3 REINFORCED CONCRETE SPECIAL MOMENT FRAME
91 FIGURE 3-1 TYPICAL FLOOR PLAN
FIGURE 3-2 TYPICAL FRAME ELEVATION, LINE A
94 1. SITE GROUND MOTION
EQUATION 11.4-1
EQUATION 11.4-2
EQUATION 11.4-3
EQUATION 11.4-4
2. DESIGN BASE SHEAR COEFFICIENT
EQUATION 12.8-7
EQUATION 12.8-8
EQUATION 12.8-1
EQUATION 12.8-2
95 EQUATION 12.8-3
EQUATOIN 12.8-4
EQUATION 12.8-5
EQUATION 12.8-6
FIGURE 3-3 TYPICAL RESPONSE SPECTRUM
96 3. REDUNDANCY FACTOR
4. COMBINED EFFECT OF HORIZONTAL AND VERTICAL EARTHQUAKE-INDUCED FORCES
EQUATION 12.4-1
EQUATOIN 12.4-2
EQUATION 12.4-3
EQUATION 12.4-4
5. VERTICAL DISTRIBUTION OF SEISMIC FORCES
5.1 STORY MASSES (WEIGHTS) ARE CALCULATED IN TABLE 3-1
TABLE 3-1 CALCULATION OF BUILDING AND STORY WEIGHTS
97 5.2 BASE SHEAR AND VERTICAL DISTRIBUTION OF SHEAR
EQUATION 12.8-11
EQUATOIN 12.8-12
TABLE 3-2 VERTICAL DISTRIBUTION OF SHEAR
98 6. FRAME NODAL AND MEMBER FORCES
TABLE 3-3 BEAM GRAVITY LOADS FOR ANALYSIS
99 TABLE 3-4 COLUMN NODAL FORCES FOR ANALYSIS
FIGURE 3-4 COMPUTER MODEL OF THE FRAME ON LINE A
100 FIGURE 3-5 COMPUTER MODEL OF THE FRAME ON LINE A WITH BEAM AND COLUMN SIZES
7. ANALYSIS AND EVALUATION OF FRAME DRIFTS
TABLE 3-5 ALLOWABLE STORY DEFORMATIONS AND DISPLACEMENTS
101 8. BEAM DESIGN
8.1 LOAD COMBINATIONS
102 8.2 DESIGN REQUIREMENTS FOR FRAME BEAMS
103 FIGURE 3-6 MOMENT AND SHEAR DIAGRAMS FOR BEAMS
105 8.3 BEAM SKIN REINFORCEMENT
8.4 BEAM SHEAR DESIGN
106 8.5 DESIGN OF ALL FRAME BEAMS
107 TABLE 3-6 BEAM MEMBER LONGITUDINAL REINFORCEMENT DESIGN
108 TABLE 3-6 BEAM MEMBER LONGITUDINAL REINFORCEMENT DESIGN (continued)
109 TABLE 3-6 BEAM MEMBER LONGITUDINAL REINFORCEMENT DESIGN (continued)
TABLE 3-7 BEAM MEMBER SHEAR REINFORCEMENT DESIGN
110 TABLE 3-7 BEAM MEMBER SHEAR REINFORCEMENT DESIGN (continued)
111 TABLE 3-7 BEAM MEMBER SHEAR REINFORCEMENT DESIGN (continued)
112 TABLE 3-8 FINAL BEAM DESIGNS
FIGURE 3-7 REPRESENTS A BEAM AT LEVEL 2 SHOWING DIMENSIONS AND REINFORCEMENT
113 9. COLUMN DESIGN
9.1 STRONG COLUMN CALCULATION
114 9.2 FORCES ON COLUMNS DUE TO FACTORED LOAD COMBINATIONS
9.3 DESIGN OF COLUMN FOR BENDING STRENGTH
EQUATION 22.4.2.2
115 TABLE 3-9 COLUMN LOADS FOR LOAD COMBINATION 6
116 TABLE 3-10 COLUMN LOADS FOR LOAD COMBINATION 7
117 TABLE 3-11 CRITICAL COLUMN LOADS FOR FRAME A
FIGURE 3-8 COLUMN P-M DIAGRAM FOR 30-INCH X 36-INCH INTERIOR COLUMN
118 FIGURE 3-9 COLUMN P-M DIAGRAM FOR 30-INCH-SQUARE CORNER COLUMN
119 TABLE 3-12 COLUMN AXIAL AND FLEXURAL DESIGN STRENGTHS
9.4 DESIGN OF COLUMNS FOR SHEAR STRENGTH
121 TABLE 3-13 CALCULATION OF COLUMN SHEAR FORCES, Ve
122 TABLE 3-14 SPECIAL TRANSVERSE REINFORCEMENT IN COLUMNS
TABLE 3-15 SHEAR STRENGTH
123 TABLE 3-16 FINAL COLUMN DESIGN AT FIRST LEVEL
FIGURE 3-10 30X36 COLUMN
124 FIGURE 3-11 30X30 COLUMN
10. JOINT SHEAR ANALYSIS
TABLE 3-17 JOINT SHEAR ANALYSIS
125 11. DEATILING OF BEAMS AND COLUMNS
11.1 BEAM REINFORCEMENT
FIGURE 3-12 BEAM-COLUMN JOINT
126 FIGURE 3-13 BEAM REINFORCEMENT LAP SPLICE
FIGURE 3-14 BEAM-COLUMN JOIN REINFORCEMENT AT EXTERIOR SPAN
11.2 COLUMN REINFORCEMENT
127 FIGURE 3-15 BEAM REINFORCEMENT AT INTERIOR SPANS
FIGURE 3-16 BEAM-COLUMN CORNER JOINT AT ROOF
128 12. FOUNDATION CONSIDERATIONS
COMMENTARY
130 DESIGN EXAMPLE 4 REINFORCED CONCRETE PARKING GARAGE
131 FIGURE 4-1 3D MODEL OF EXAMPLE STRUCTURE
132 1. BUILDING GEOMETRY AND LOADS
1.1 GIVEN INFORMATION
133 TABLE 4-1 SLAB-TO-SLAB COLUMN SPANS ON GRID LINE B (INCHES)
134 FIGURE 4-2 LEVEL 3.0-3.5 PLAN
FIGURE 4-3 BASE PLAN
135 FIGURE 4-4 SECTION AT GRID LINE B
1.2 MATERIAL WEIGHTS
1.3 LIVE LOADS
136 1.4 SEISMIC MASS
TABLE 4-2 SUMMATION OF SEISMIC MASS
2. LOAD COMBINATIONS FOR DESIGN
137 EQUATION 12.4-3
EQUATION 12.4-7
EQUATION 12.4-4A
3. LATERAL ANALYSIS
3.1 STRUCTURAL SYSTEM
3.2 HORIZONTAL STRUCTURAL IRREGULARITIES
3.3 VERTICAL STRUCTURAL IRREGULARITIES
3.4 PROHIBITED IRREGULARITIES
138 3.5 ADDITIONAL REQUIREMENTS
3.6 DIAPHRAGM CLASSIFICATION
3.7 REDUNDANCY
3.8 ANALYSIS PROCEDURE
139 3.9 STRUCTURAL MODELING
TABLE 4-3 ETABS SECTION PROPERTY MODIFIERS
3.10 PERIOD DETERMINATION
EQUATION 12.8-7
140 3.11 SEISMIC RESPONSE COEFFICIENT
EQUATION 12.8-2
EQUATION 12.8-3
EQUATION 12.8-5
EQUATION 12.8-6
141 3.12 SEISMIC BASE SHEAR
EQUATION 12.8-1
3.13 VERTICAL DISTRIBUTION OF SEISMIC FORCES
EQUATION 12.8-11
EQUATION 12.8-12
TABLE 4-4 SEISMIC FORCE DISTRIBUTION
142 4. SLAB, BEAM, AND COLUMN DESIGN
FIGURE 4-5 MEMBERS SELECTED FOR GRAVITY DESIGN
143 4.1 POST-TENSIONED SLAB
FIGURE 4-6 P/T SLAB REINFORCEMENT
144 4.2 POST-TENSIONED BEAMS
TABLE 4-5 BEAM FORCES (UNITS OF kips AND kip-ft)
146 FIGURE 4-7 BEAM AND COLUMN MOMENT DIAGRAMS: (A) LINE 2 (B) LINE 3 (C) LINE 4 (D) LINE 5
FIGURE 4-8 P/T BEAM REINFORCEMENT
147 4.3 COLUMNS
TABLE 4-6 COLUMN FORCES (UNITS OF kips AND kip-ft)
148 TABLE 4-6 COLUMN FORCES (UNITS OF kips AND kip-ft) (continued)
149 FIGURE 4-9 COLUMN INTERACTION DIAGRAMS
150 TABLE 4-7 PROBABLE MOMENT CAPACITY FOR COLUMNS ON GRID LINES 2 AND 5
FIGURE 4-10 COLUMN REINFORCEMENT
5. WALL AND RAMP FORCES
151 TABLE 4-8 MAXIMUM SEISMIC SHEAR FORCES IN WALL ELEMENTS (kips)
TABLE 4-9 MAXIMUM SEISMIC AXIAL AND SHEAR FORCES IN RAMP ELEMENTS (kips)
152 6. PROVISIONS FOR SECONDARY FRAME MEMBERS
153 TABLE 4-10 PROVISIONS FOR SECONDARY FRAME MEMBERS PER SECTION 18.14
154 FIGURE 4-11 SECTION 18.14 DESIGN PROCEDURE
6.1 DESIGN AND DETAILING OF SECONDARY BEAMS
156 EQUATION 11.5.4.8
158 6.2 DESIGN AND DETAILING OF SECONDARY COLUMNS
TABLE 4-11 DESIGN STEP 3: COLUMN AXIAL STRESS FOR LOAD COMBINATIONS 6 AND 7
159 TABLE 4-12 MAXIMUM COLUMN FORCES AT DESIGN DISPLACEMENT (UNITS OF kips AND k-ft)
160 FIGURE 4-12 COLUMN INTERACTION DIAGRAMS WITH SEISMIC FORCES DETERMINED AT DESIGN DISPLACEMENT
163 TABLE 4-13 COLUMN DETAILING AND SHEAR STRENGTH REQUIREMENTS
164 TABLE 4-14 COLUMN LONGITUDINAL REINFORCEMENT PER ACI 318 SECTION 18.7.4.1
168 TABLE 4-15 COLUMN SEISMIC DESIGN SHEAR Ve—NORTH-SOUTH DIRECTION
TABLE 4-16 COLUMN SEISMIC DESIGN SHEAR Ve—EAST-WEST DIRECTION
169 TABLE 4-17 COLUMN SHEAR REINFORCEMENT DESIGN: LEVEL 1.5
FIGURE 4-13 FREE-BODY DIAGRAM AT BEAM-COLUMN JOINTS
170 FIGURE 4-14 BEAM-COLUMN JOINTS AT LEVEL 1.5
FIGURE 4-15 SLAB-COLUMN JOINTS AT LEVEL 1.5
171 FIGURE 4-16 FEM MODEL FOR FULL-HEIGHT COLUMN METHOD
172 TABLE 4-18 COLUMN DESIGN SHEAR: FULL-HEIGHT COLUMN METHOD
TABLE 4-19 COLUMN DESIGN SHEAR: SIMPLIFIED PUSHOVER METHOD
174 EQUATION 18.7.5.3
175 TABLE 4-20 DESIGN REFERENCE FOR COLUMN SHEAR REINFORCEMENT
176 FIGURE 4-17 BEAM AND COLUMN SHEAR REINFORCEMENT
7. DIAPHRAGM ANALYSIS
EQUATION 12.10-1
EQUATION 12.10-2
EQUATION 12.10-2
177 TABLE 4-21 DIAPHRAGM INERTIAL FORCES
178 TABLE 4-22 SEISMIC SHEAR FORCES AT SLAB-WALL INTERFACES (kips)
TABLE 4-23 MAXIMUM SEISMIC FORCES AT THE RAMPS (kips AND kip-ft)
8. DIAPHRAGM DESIGN
8.1 SHEAR DESIGN
179 EQUATION 18.12.9.1
8.2 CHORD AND COLLECTOR REINFORCEMENT
180 8.3 DIAPHRAGM CHORD DESIGN
181 9. COLLECTOR DESIGN
9.1 DIAPHRAGM STRENGTHENING AT GRID LINE 9
182 FIGURE 4-18 SLAB STRESS CONTOURS AT LEVEL 2.0
9.2 SHEAR TRANSFER DESIGN AT GRID LINE 9
EQUATION 22.9.4.2
183 EQUATION 25.4.2.3 (A)
184 FIGURE 4-19 PARTIAL PLAN AT LINE 9
185 9.3 SLAB COLLECTOR DESIGN AT GRID LINE A
187 FIGURE 4-20 COLLECTOR DIAGRAM LINE A
188 FIGURE 4-21 FREE-BODY DIAGRAM, LINE A
9.4 SHEAR TRANSFER DESIGN AT GRID LINE A
189 FIGURE 4-22 PARTIAL PLAN, LINE A
FIGURE 4-23 SHAR TRANSFER AT SLAB-WALL INTERFACES
190 SUMMARY
192 DESIGN EXAMPLE 5 PILE FOUNDATION
1. BUILDING GEOMETRY AND LOADS
1.1 GIVEN INFORMATION
193 FIGURE 5-1 FOUNDATION PLAN
1.2 DESIGN VERTICAL LOADS
194 TABLE 5-1 LOADING AT VARIOUS SUPPORT CONDITIONS
1.3 GEOTECHNICAL RECOMMENDATIONS
FIGURE 5-2 GEOTECHNICAL PILE CAPACITY VS. DEPTH, FROM GEOTECHNICAL REPORT
195 2. LOAD COMBINATIONS FOR DESIGN
2.1 COMBINATIONS FOR GEOTECHNICAL DESIGN
EQUATION 16-17
EQUATION 16-21
EQUATION 16-22
2.2 COMBINATIONS FOR STRUCTURAL DESIGN
EQUATION 16-1
EQUATION 16-2
EQUATION 16-5
EQUATION 16-7
3. DETERMINATION OF OPTIMAL PILE CAPACITY AND LENGTH
3.1 NUMBER OF PILES PER LOCATION—GEOTECHNICAL DESIGN
196 TABLE 5-2 LOAD COMBINATIONS FOR GEOTECHNICAL DESIGN
197 FIGURE 5-3 GEOTECHNICAL PIL CAPACITY VS. DEPTH, WITH SELECTED DEPTH AND CAPACITY
TABLE 5-3 NUMBER OF PILES REQUIRED FOR EACH CONDITION
198 4. PRELIMINARY PILE VERTICAL REINFORCEMENT
4.1 MINIMUM REINFORCEMENT
4.2 LIMITING LOADS
5. BUILDING BASE SHEAR RESISTANCE
5.1 DISTRIBUTION THROUGH GROUND LEVEL SLAB
199 5.2 PASSIVE PRESSURE ON CAPS
5.3 PILE GROUP EFFICIENCY
TABLE 5-4 COMPUTED p-MODIFICATION FACTORS FOR GROUPS OF VARIOUS NUMBERS OF PILES IN STANDARD FORMATIONS, WITH THREE-DIAMETER SPACING
6. LATERAL-LOADING ANALYSIS
6.1 PILE LATERAL STIFFNESS
200 TABLE 5-5 COMPUTED FACTORED AXIAL LOADS PER PILE FOR VARIOUS SUPPORT TYPES
6.2 CONSISTENT LATERAL DEFORMATIONS
TABLE 5-6 AXIAL LOAD, MOMENT, AND SHEAR FOR SELECTED DESIGN POINTS
201 6.3 RESISTANCE OF TOTAL BASE SHEAR
TABLE 5-7 LATERAL RESISTANCE DUE TO PASSIVE PRESSURE AND PILE BENDING
202 7. CHECK OF AXIAL-MOMENT INTERACTION
7.1 ACI 318 REQUIREMENTS
EQUATOIN 22.4.2.2
7.2 CONTROLLING DESIGN POINTS
FIGURE 5-4 AXIAL-MOMENT INTERACTION WITH AXIAL LOAD LIMITED PER ACI 318
203 8. DESIGN OF TRANSVERSE REINFORCING
8.1 IBC DETAILING REQUIREMENTS
TABLE 5-8 TRANSVERSE REINFORCING REQUIREMENTS
8.2 CHECK PILE MOMENT VS. DEPTH FOR REINFORCED LENGTH
EQUATION 18-10
204 FIGURE 5-5 MOMENT VS DEPTH FROM LPILE, WITH CRACKING MOMENT SHOWN
205 8.3 CHECK PILE SHEAR CAPACITY
9. DEVELOPMENT OF VERTICAL BARS INTO CAP
9.1 DEVELOPMENT OF STRAIGHT BARS
EQUATION 25.4.2.3A
FIGURE 5-6 CENTER-TO-CENTER SPACING OF SIX BARS IN A 16-INCH PILE WITH 3 INCHES OF CLEAR COVER
EQUATION 25.4.2.3A
206 9.2 DEVELOPMENT OF HEADED BARS
9.3 EMBEDMENT OF PILES INTO CAP
9.4 DESIGN OF GRADE BEAMS
9.5 SUMMARY OF DESIGN
FIGURE 5-7 GRADE BEAM DETAIL SHOWING CONNECTION TO SLAB-ON-GRADE
207 FIGURE 5-8 PILE DETAIL SHOWING DIMENSIONS AND REINFORCING
208 10. REFERENCES
210 DESIGN EXAMPLE 6 PILE FOUNDATION FOR SMRF
1. GIVEN INFORMATION
1.1 PROJECT SEISMIC DATA
211 1.2 FRAME LOADING AND GEOMETRY
FIGURE 6-1 FRAME ELEVATION
212 FIGURE 6-2 LOWEST LEVEL FRAME COLUMN DETAIL
2. CASE I: MOMENTS RESISTED BY CONTINUOUS STIFF GRADE BEAM
2.1 MODELING
2.2 LOADING
213 FIGURE 6-3 PROBABLE STRENGTH COLUMN INTERACTION DIAGRAM
214 FIGURE 6-4 GRADE BEAM MOMENT AND SHEAR DIAGRAMS FOR DESIGN
215 2.3 PILE DESIGN
2.4 LONGITUDINAL GRADE BEAM DESIGN
FIGURE 6-5 GRADE BEAM SECTION
216 EQUATION 22.5.5.1
2.5 TRANSVERSE GRADE BEAM DESIGN
217 FIGURE 6-6 GRADE BEAM TRANSVERSE SECTION SHOWING STRUT-AND-TIE GEOMETRY
219 FIGURE 6-7 GRADE BEAM TRANSVERSE SECTION SHOWING VERTICAL BAR EXTENSIONS
3. CASE II: MOMENTS RESISTED BY GRADE BEAM AND PILE FLEXURE
3.1 MODELING
FIGURE 6-8 PARTIAL FRAME ELEVATION
220 3.2 LOADING
TABLE 6-1 ROTATIONAL STIFFNESS AT 500 KIP-INCHES
221 FIGURE 6-9 GRADE BEAM MOMENT AND SHEAR DIAGRAMS FOR DESIGN
3.3 PILE DESIGN
222 FIGURE 6-10 PILE AXIAL-MOMENT INTERACTION DIAGRAM FOR PILES FROM DESIGN EXAMPLE 5 WITH UPDATED AXIAL LOADS
223 FIGURE 6-11 PILE AXIAL-MOMENT INTERACTION DIAGRAM FOR PILES WITH HEAVIER REINFORCING
3.4 GRADE BEAM DESIGN
224 FIGURE 6-12 GRADE BEAM SECTION
225 4. CASE III: MOMENTS RESISTED BY PILE AXIAL LOADS
FIGURE 6-13 PARTIAL FRAME ELEVATION
TABLE 6-2 INDIVIDUAL PILE LOADS
226 FIGURE 6-14 SEISMIC REACTIONS
228 FIGURE 6-15 TRANSVERSE SECTION OF CAP
230 DESIGN EXAMPLE 7 DESIGN OF CONCRETE DIAPHRAGM AND COLLECTOR
231 1. BULDING GEOMETRY AND LOADS
1.1 GIVEN INFORMATION
FIGURE 7-1 TYPICAL FLOOR FRAMING PLAN
232 FIGURE 7-2 PENTHOUSE FRAMING PLAN
FIGURE 7-3 BUILDING ELEVATION AT GRID LINE A
233 FIGURE 7-4 BUILDING ELEVATION AT GRID LINE D
FIGURE 7-5 BUILDING ELEVATION AT GRID LINE 1
234 FIGURE 7-6 BUILDING 3D VIEW
235 1.2 ASSEMBLY WEIGHTS
236 1.3 FLOOR AND ROOF WEIGHTS
2. DETERMINATION OF DIAPHRAGM DEMANDS
2.1 DESIGN SPECTRAL ACCELERATIONS
237 EQUATION 11.4-1
EQUATION 11.4-2
EQUATION 11.4-3
EQUATION 11.4-4
2.2 SEISMIC DESIGN CATEGORY
2.3 LOAD COMBINATIONS
EQUATION 12.4-1
EQUATION 12.4-2
EQUATION 12.4-3
EQUATION 12.4-4
EQUATION 12.4-5
EQUATION 12.4-6
EQUATION 12.4-7
238 2.4 DESIGN BASE SHEAR
EQUATION 12.8-7
EQUATION 12.8-1
EQUATION 12.8-2
239 EQUATION 12.8-3
EQUATION 12.8-5
EQUATION 12.8-6
2.5 VERTICAL DISTRIBUTION OF FORCES
EQUATION 12.8-11
EQUATION 12.8-12
240 TABLE 7-1 DETERMINATION OF Fx
2.6 DIAPHRAGM DESIGN FORCES
EQUATION 12.10-1
TABLE 7-2 DETERMINATION OF Fpx
241 2.7 DIAPHRAGM DESIGN FORCES ALTERNATIVE METHOD
EQUATION 12.10-4
EQUATION 12.10-6
EQUATION 12.10-8
EQUATION 12.10-9
EQUATION 12.10-13
242 EQUATION 12.10-5
3. DETERMINATION OF DIAPHRAGM SHEARS AND CHORD FORCES FOR BUILDING WITH LARGE OPENING
243 FIGURE 7-7 CUMULATIVE STORY SHEAR WALL FORCES BY LEVEL—WALL ON GRD LINE A
FIGURE 7-8 CUMULATIVE STORY SHEAR WALL FORCES BY LEVEL—WALL ON GRID LINE D
244 FIGURE 7-9 PLAN VIEW FO THIRD-FLOOR DIAPHRAGM LOADING
3.1 DETERMINATION OF DIAPHRAGM SHEARS
FIGURE 7-10 BEAM MODEL OF DIAPHRAGM IN THE EAST-WEST DIRECTION
245 FIGURE 7-11 SHEAR DIAGRAM OF THE DIAPHRAGM IN THE EAST-WEST DIRECTION
EQUATION 22.5.5.1
246 3.2 DETERMINATION OF CHORD FORCES
FIGURE 7-12 MOMENT DIAGRAM OF THE DIAPHRAGM IN THE EAST-WEST DIRECTION
247 FIGURE 7-13 PLAN VIEW OF THE THIRD-FLOOR DIAPHRAGM LOAD DISTRIBUTION AROUND THE OPENING
248 FIGURE 7-14 FREE-BODY DIAGRAM OF THIRD-FLOOR DIAPHRAGM SEGMENT ADJACENT TO OPENING
249 4. DESIGN OF DIAPHRAGM REINFORCEMENT FOR DIAPHRAGM WITH LARGE OPENINGS
250 FIGURE 7-15 CHORD REINFORCEMENT DETAIL AT OPENING
251 FIGURE 7-16 CHORD REINFORCEMENT PLAN FOR SEISMIC FORCE IN EAST-WEST DIRECTION
5. COLLECTOR DESIGN
5.1 COLLECTOR FORCE
252 FIGURE 7-17 COLLECTOR FORCE DIAGRAM
253 5.2 DESIGN LOAD COMBINATION
5.3 COLLECTOR BEAM DESIGN
254 FIGURE 7-18 COLLECTOR BEAM P-M DIAGRAM
255 FIGURE 7-19 COLLECTOR BEAM AND DIAPHRAGM CHORD REINFORCEMENT DETAIL
256 6. COMPARISON OF DIAPHRAGM FORCE AND CHORD FORCE USING RIGID DIAPHRAGM ASSUMPTION AND HAND CALCULATIONS VS. COMPUTER MODEL ANALYSIS WITH SEMIRIGID DIAPHRAGM ASSUMPTION
6.1 CASE STUDIES
FIGURE 7-20 CASE 1: RESULTANT F22 FORCE DIAGRAM ON THE DIAPHRAGM
257 FIGURE 7-21 CASE 1: SECTION-CUT FORCES ON THE DIAPHRAGM
258 FIGURE 7-22 BEAM MODEL OF DIAPHRAGM IN THE EAST-WEST DIRECTION
259 6.2 CASE STUDY—DIAPHRAGM WITH OPENINGS
FIGURE 7-23 CASE 3: F22 FORCE DIAGRAM ON THE DIAPHRAGM
261 6.3 CALCULATION OF DIAPHRAGM DEMANDS
CONCLUSION
262 ACKNOWLEDGMENTS
264 SEAOC WIND DESIGN MANUAL
265 2019 EDITION OF THE SEAOC BLUE BOOK: SEISMIC DESIGN RECOMMENDATIONS
266 TOP TOOLS FOR STRUCTURAL DESIGN
267 ICC’S DIGITAL CODES LIBRARY
ICC IBC SEAOC SSDM V3 2018
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