Design Guide for Reinforced Concrete Diaphragms

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