Blast-resistant highway bridges: design and detailing guidelines

NCHRP Report 645 – Blast-Resistant Highway Bridges: Design and Detailing Guidelines......Page 1
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Transportation Research Board 2009 Executive Committee......Page 2
Blast-Resistant Highway Bridges: Design and Detailing Guidelines......Page 3
About the National Academies......Page 5
Author Acknowledgments......Page 6
Foreword......Page 7
Contents......Page 8
Summary......Page 10
1.1 Overview......Page 13
1.2 Background and History......Page 14
1.3 Research Approach......Page 16
2.2.1 Blast Loads and Shock Phenomena......Page 17
2.2.3 Dynamic Material Strength and Strain-Rate Effects......Page 22
2.2.4 Application of Seismic Design to Blast-Loaded Bridges......Page 24
2.2.5 Design Issues......Page 27
2.3.1 Research Needs and Focus of Current Study......Page 33
2.3.2 Blast-Resistant Design: Buildings versus Bridges......Page 34
2.3.3 Current and Past Research on Highway Bridges......Page 35
2.4 Focus of Current Work......Page 37
3.2.1 Experimental Setup......Page 39
3.3 Phase II Response Test......Page 40
3.3.1 Background on Parameters Selected for Testing......Page 42
3.3.2 Column Design......Page 46
3.3.4 Data Acquisition and Instrumentation Plan......Page 50
3.3.6 Small Standoff Test Setup......Page 52
3.3.7 Spall/Breach Test Setup......Page 53
3.4 Summary......Page 54
4.2 Current State-of-Practice: SDOF......Page 55
4.3.1 Load Prediction Techniques......Page 58
4.3.2 Response Prediction......Page 59
4.3.3 Advanced Modeling Methods and Software......Page 64
5.1.1 Phase I Tests......Page 69
5.1.2 Phase II Tests......Page 74
5.2.2 Actual Boundary Conditions......Page 92
5.2.3 Actual Load Distribution......Page 94
5.3 Summary......Page 96
6.2 Risk Assessment Guidelines for Bridges......Page 97
6.3 Blast-Load Guidelines......Page 98
6.4 Design and Detailing Guidelines for Columns......Page 99
6.4.1 Design Category A......Page 100
6.4.3 Design Category C......Page 101
6.5 Analysis Guidelines for Columns......Page 106
6.6 Summary......Page 108
7.2 Simplified Analyses Guidelines......Page 109
7.3 Airblast Modeling Using Computation Fluid Dynamics......Page 111
7.4 Concrete Modeling......Page 114
7.5 Coupled Analyses......Page 115
7.6 Summary......Page 116
8.2 Design Examples......Page 117
8.2.1 Design Example 1: Design Category C Column......Page 118
8.2.2 Design Example 2: Design Category C Column......Page 124
8.2.3 Design Example 3: Design Category B Column......Page 132
8.2.4 Design Example 4: Design Category A Column......Page 138
8.3 Summary......Page 142
9.1 Summary of Research Program......Page 143
9.2.3 Summary of Design Guidelines......Page 144
9.3 Recommendations for Future Work......Page 145
References......Page 147
List of Variables......Page 150
Abbreviations used without definitions in TRB publications......Page 152