Simplified Design of Reinforced Concrete Buildings

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

About Author:

I am Thomas Britto here to share my experiences in the civil engineering field to all my readers.Today many students are struggling to buy books at high prices. So I decided to start a blog and share my experience and knowledge with all my readers.

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Simplified Design of Reinforced Concrete Buildings