Simplified Design of Reinforced Concrete Buildings

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Simplified Design of Reinforced Concrete Buildings


Contents

Chapter 1—A Simplified Design Approach . . . 1-1

1.1 THE BUILDING UNIVERSE  . . 1-1
1.2 COST EFFICIENCIES   . . . . . . 1-2
1.3 THE COMPLEX CODE   . . . . . 1-3
1.3.1 Complex Structures Require Complex Designs   . . . . . 1-3
1.4 A SIMPLE CODE   . . . . . . . . . . 1-4
1.5 PURPOSE OF SIMPLIFIED DESIGN  . . . . . . . . . 1-5
1.6 SCOPE OF SIMPLIFIED DESIGN . . . . . . . . . . . . 1-5
1.7 BUILDING EXAMPLES   . . . . . 1-7
1.7.1 Building No. 1—3-Story Pan Joist Construction   . . . . . 1-8
1.7.2 Building No. 2—5-Story Flat Plate Construction  . . . . 1-10
1.8 PRELIMINARY DESIGN   . . . 1-12
1.8.1 Floor Systems   . . . . . . . 1-12
1.8.2 Columns   . . . . . . . . . . . 1-16
1.8.3 Shearwalls  . . . . . . . . . . 1-16
1.8.4 Footings   . . . . . . . . . . . 1-20
1.8.5 Fire Resistance   . . . . . . 1-20
References    . 1-20

Chapter 2—Simplified Frame Analysis  . . . . . . . 2-1

2.1 INTRODUCTION   . . . . . . . . . . 2-1
2.2 LOADING    . 2-1
2.2.1 Service Loads   . . . . . . . . 2-1
2.2.2 Wind Loads   . . . . . . . . . . 2-2
2.2.2.1 Example: Calculation of Wind Loads – Building #2  . . . . . . . . . . . . 2-4
2.2.2.2 Example: Calculation of Wind Loads – Building #1  . . . . . . . . . . . . 2-6
2.2.3 Live Load Reduction for Columns, Beams, and Slabs   2-7
2.2.3.1 Example: Live Load Reductions for Building #2   . 2-8
2.2.4 Factored Loads   . . . . . . . 2-9
2.3 FRAME ANALYSIS BY COEFFICIENTS  . . . . . . 2-11
2.3.1 Continuous Beams and One-Way Slabs . . 2-11
2.3.2 Example: Frame Analysis by Coefficients  2-13
2.4 FRAME ANALYSIS BY ANALYTICAL METHODS   . . . . . . . 2-14
2.4.1 Stiffness   . . . . . . . . . . . 2-14
2.4.2 Arrangement of Live Load  2-15
2.4.3 Design Moments   . . . . . 2-15
2.4.4 Two-Cycle Moment Distribution Analysis for Gravity Loading  . . . . . . . . 2-18
2.5 COLUMNS    . 2-18
2.6 LATERAL LOAD ANALYSIS  . 2-19
2.6.1 Portal Method   . . . . . . . 2-19
2.6.2 Examples: Wind Load Analyses for Buildings #1 and #2  . . . . . . . . . . . . 2-20

Chapter 3—Simplified Design for Beams and One-Way Slabs  . . . . . . 3-1

3.1 INTRODUCTION   . . . . . . . . . . 3.1
3.2 DEPTH SELECTION FOR CONTROL OF DEFLECTIONS   3-1
3.3 MEMBER SIZING FOR MOMENT STRENGTH  . 3-3
3.3.1 Notes on Member Sizing for Economy  . . . . 3-4
3.4 DESIGN FOR FLEXURAL REINFORCEMENT . . 3-5
3.5 REINFORCING BAR DETAILS   . 3-6
3.6 DESIGN FOR SHEAR REINFORCEMENT  . . . . 3-11
3.6.1 Example: Design for Shear Reinforcement   . . . . . . . 3-20
3.6.2 Selection of Stirrups for Economy  . . . . . . 3-22
3.7 DESIGN FOR TORSION   . . . 3-22
3.7.1 Beam Sizing to Neglect Torsion  . . . . . . . . 3-23
3.7.1.1 Example: Beam Sizing to Neglect Torsion   . . . 3-30
3.7.2 Beam Design Considering Torsion  . . . . . . 3-31
3.7.3 Simplified Design for Torsion Reinforcement   . . . . . . 3-32
3.7.3.1 Example: Design for Torsion Reinforcement   . 3-34
3.8 EXAMPLES: SIMPLIFIED DESIGN FOR BEAMS AND ONE-WAY SLABS . . 3-36
3.8.1 Example: Design of Standard Pan Joists for Alternate (1) Floor System
(Building #1)   . . . . . . . . 3-37
3.8.2 Example: Design of Wide-Module Joists for Alternate (2) Floor System (Building #1) . . . . 3-41
3.8.3 Example: Design of the Support Beams for the Standard Pan Joist Floor Along a
Typical N-S Interior Column Line (Building #1)   . . . . . 3-46

Chapter 4—Simplified Design for Two-Way Slabs  . . . . 4-1

4.1 INTRODUCTION   . . . . . . . . . . 4-1
4.2 DEFLECTION CONTROL–MINIMUM SLAB THICKNESS   . 4-3
4.3 TWO-WAY SLAB ANALYSIS BY COEFFICIENTS—DIRECT DESIGN METHOD  4-6
4.4 SHEAR IN TWO-WAY SLAB SYSTEMS  . . . . . . 4-15
4.4.1 Shear in Flat Plate and Flat Slab Floor Systems   . . . 4-16
4.5 COLUMN MOMENTS DUE TO GRAVITY LOADS   . . . . . . 4-21
4.6 REINFORCEMENT DETAILING  . . . . . . . . . . . . 4-23
4.7 EXAMPLES: SIMPLIFIED DESIGN FOR TWO-WAY SLABS  . . . . . . . . . . . . 4-23
4.7.1 Example: Interior Strip (N-S Direction) of Building #2, Alternate (2)  . . . 4-24
4.7.2 Example: Interior Strip (N-S Direction) of Building #2, Alternate (1)  . . . 4-31

Chapter 5—Simplified Design for Columns  . . 5-1

5.1 INTRODUCTION   . . . . . . . . . . 5-1
5.2 DESIGN CONSIDERATIONS  . 5-1
5.2.1 Column Size   . . . . . . . . . 5-1
5.2.2 Column Constructability   5-1
5.2.3 Column Economics   . . . . 5-2
5.3 DESIGN STRENGTH FOR COLUMNS  . . . . . . . . 5-2
5.4 PRELIMINARY COLUMN SIZING  . . . . . . . . . . . . 5-4
5.5 SIMPLIFIED DESIGN FOR COLUMNS . . . . . . . . 5-7
5.5.1 Simplified Design Charts—Combined Axial Load and Bending Moment  . 5-7
5.5.1.1 Example: Construction of Simplified Design Chart . . . . . . . . . . . . 5-11
5.5.2 Column Ties   . . . . . . . . 5-15
5.5.3 Biaxial Bending of Columns  . . . . . . . . . . . 5-17
5.5.3.1 Example: Simplified Design of a Column Subjected to Biaxial Loading . . . . . . . . . . 5-18
5.6 COLUMN SLENDERNESS CONSIDERATIONS 5-22
5.6.1 Non-sway versus Sway Frames  . . . . . . . . 5-22
5.6.2 Minimum Sizing for Design Simplicity . . . . 5-22
5.7 PROCEDURE FOR SIMPLIFIED COLUMN DESIGN   . . . . 5-24
5.8 EXAMPLES: SIMPLIFIED DESIGN FOR COLUMNS   . . . 5-25
5.8.1 Example: Design of an Interior Column Stack for Building #2 Alternate (1)—Slab and
Column Framing Without Structural Walls (Sway Frame) . . . . . . . . . . . . 5-25
5.8.2 Example: Design of an Interior Column Stack for Building #2 Alternate (2)—Slab and
Column Framing with Structural Walls (Non-sway Frame)  . . . . . . . . . . . 5-29
5.8.3 Example: Design of an Edge Column Stack (E-W Column Line) for Building #1—
3-story Pan Joist Construction (Sway Frame)  . . . . . . 5-31
5.9 COLUMN SHEAR STRENGTH   5-35
5.9.1 Example: Design for Column Shear Strength   . . . . . 5-35
References    . . 5-45

Chapter 6—Simplified Design for Structural Walls   . . . 6-1

6.1 INTRODUCTION   . . . . . . . . . . 6-1
6.2 FRAME-WALL INTERACTION  6-1
6.3 WALL SIZING FOR LATERAL BRACING  . . . . . . 6-2
6.3.1 Example: Wall Sizing for Non-sway Condition  . . . . . . 6-2
6.4 DESIGN FOR SHEAR   . . . . . . 6-4
6.4.1 Example 1: Design for Shear . . . . . . . . . . . 6-7
6.4.2 Example 2: Design for Shear . . . . . . . . . . . 6-9
6.5 DESIGN FOR FLEXURE   . . . 6-11
6.5.1 Example: Design for Flexure  . . . . . . . . . . 6-12



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