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Design Guide for Reinforced Concrete Diaphragms

Design Guide for Reinforced Concrete Diaphragms


Design Guide for Reinforced Concrete Diaphragms A guide to assist design professionals in efficiently designing and detailing reinforced concrete diaphragms.

The objective of this guide is to provide comprehensive information on the design and detailing of reinforced concrete columns in buildings assigned to any Seismic Design Category. The design and detailing requirements in ACI 318-14 are clearly summarized in tables and figures for quick reference. Numerous design aids and flow charts are provided that can be used to determine the size of the cross-section and the required amounts of longitudinal and transverse reinforcement for members subjected to axial compression or combined flexure and axial compression. Slenderness effects are also covered, including methods on how to size a column so that such effects can be neglected. A collection of design strength interaction diagrams are given in an appendix that covers tied, rectangular columns ranging in size from 12 to 48 in.; tied and spiral circular columns ranging in diameter from 12 to 48 in.; Grade 60 and Grade 80 longitudinal reinforcement; concrete compressive strengths from 4,000 psi to 14,000 psi; and longitudinal reinforcement ratios from 1% to less than 2.5%. Numerous worked-out examples illustrate the proper application of the code provisions and demonstrate the use of the design aids.

Table of contents :
Foreword……Page 4

Contents……Page 5
1.3 Scope……Page 7
1.4 Organization of this Publication……Page 8
2.3 Nonprestressed Reinforcement……Page 11
3.2.2 Two-way Slabs……Page 13
3.3.3 Shear……Page 14
3.4.2 One-way Shear……Page 16
3.4.3 Two-way Shear……Page 17
3.6 Minimum Diaphragm Thickness for SDC D, E, and F……Page 21
4.2.1 Wind Forces……Page 23
4.2.3 Seismic Forces……Page 28
4.2.4 Soil Lateral Forces……Page 33
4.2.5 Flood and Tsunami Forces……Page 34
4.3 Transfer Forces……Page 35
4.4.2 Wind Forces……Page 36
4.4.3 Seismic Forces……Page 37
4.5 Column Bracing Forces……Page 38
4.7.2 Collector Design Forces for Buildings Assigned to SDC C through F……Page 39
5.2 Strength Design Load Combinations……Page 41
5.3 Seismic Load Combinations for SDC B……Page 42
5.4 Seismic Load Combinations for SDC C……Page 43
5.5 Seismic Load Combinations for SDC D, E, and F……Page 44
6.2 In-plane Stiffness Modeling……Page 47
6.3.2 Load Paths for Lateral Forces……Page 48
6.3.3 Horizontal Distribution of Lateral Forces……Page 49
6.3.4 ACI 318 Analysis Methods……Page 52
6.4.2 Equivalent Beam Model with Rigid Supports……Page 53
6.4.3 Corrected Equivalent Beam Model withSpring Supports……Page 57
6.7 Alternative Models……Page 61
7.3.3 Shear……Page 63
7.3.5 Collectors……Page 65
8.3 Reinforcement Detailing Requirements……Page 67
8.4.2 Location of Chord Reinforcement……Page 68
8.4.3 Compression Chords……Page 69
8.6.2 Shear Transfer in a Diaphragm……Page 70
8.6.3 Required Shear Transfer Reinforcement Between the Diaphragm and the Vertical Elements of the LFRS– Construction Method A……Page 71
8.6.4 Required Shear Transfer Reinforcement Between the Diaphragm and the Vertical Elements of the LFRS– Construction Method B……Page 75
8.6.5 Required Shear Transfer Reinforcement Betweenthe Diaphragm and the Collector Elements……Page 76
8.8.3 Wind Forces……Page 77
8.8.4 Seismic Forces……Page 78
8.9.2 Slabs……Page 79
8.9.3 Beams……Page 81
8.10 Summary of Design and Detailing Requirements……Page 83
9.3 Step 2 – Determine the Diaphragm Thickness……Page 86
9.6 Step 5 – Determine the Combined Load Effects……Page 87
9.12 Step 11 – Determine the Collector Reinforcement……Page 88
10.2 Example 10.1 – One-story Retail Building (SDC A)……Page 103
10.3 Example 10.2 – Seven-story Office Building (SDC B)……Page 118
10.4 Example 10.3 – Eighteen-story Residential Building (SDC C)……Page 140
10.5 Example 10.4 – Thirty-story Office Building (SDC D)……Page 165
10.6 Example 10.5 – Five-story Residential Building (SDC D)……Page 187
Chapter 11 References……Page 212
Notations……Page 215

Details

Title Design Guide for Reinforced Concrete Diaphragms 
Author Concrete Reinforcing Steel Institute
Language English
ISBN ISBN 978-1943961467
Size 24 MB
Download Method Direct Download  
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