DESIGN SPECIFICATIONS FOR HIGHWAY BRIDGES - IISEE

Ground Flow ................................................................................................... 41
Chapter 9 Verification of Seismic Performance of Seismically Isolated
(Menshin) Bridges ..................................................................... 43
9.1 General ..................................................................................................................... 43
9.2 Verification of Seismic Performance of Seismically-Isolated Bridges ................... 44
9.3 Analytical Model of Isolation Bearings ................................................................... 45
9.3.1 General ........................................................................................................... 45
9.3.2 Inelastic Hysteretic Model of Isolation Bearings ......................................... 45
9.3.3 Equivalent Linear Model of Isolation Bearings ............................................ 46
9.4 Basic Performance Requirement for Isolation Bearings ........................................ 48
9.5 Other Structures for reducing Effects of Earthquake ............................................ 48
Chapter 10 Lateral Strength and Ductility Capacity of Reinforced
Concrete Columns ..................................................................... 49
10.1 General ..................................................................................................................... 49
10.2 Evaluation of Failure Mode, Lateral Strength and Ductility Capacity ................ 50
10.3 Calculation of Lateral Strength and Displacement ............................................... 52
10.4 Stress–Strain Curve of Concrete ............................................................................ 55
10.5 Shear Strength ........................................................................................................ 56
10.6 Structural Details for Improving Ductility Performance ...................................... 58
10.7 Cut-off of Longitudinal Reinforcement at Mid-Height .......................................... 59
10.8 Lateral Strength and Ductility Capacity of Reinforced Concrete Two Column
Bents ........................................................................................................................ 61
10.9 Effect of Eccentric Loading of Superstructure ....................................................... 63
Chapter 11 Verification of Sesmic Performance of Steel Colums ................ 66
11.1 General ..................................................................................................................... 66
11.2 Verification of Seismic Performance by Dynamic Analysis ................................... 66
11.3 Structural Details .................................................................................................... 67
11.4 Design for Anchorage Block .................................................................................... 67
Chapter 12 Verification of Sesmic Performance of Pier Foundations ......... 68
12.1 General ..................................................................................................................... 68
12.2 Calculation of Sectional Force, Ground Reaction Force, and Displacement of
Pier Foundations ..................................................................................................... 68
12.3 Yielding of Pier Foundations ................................................................................... 68
12.4 Calculation of Foundation Response in Case of Plastic Hinges Generating in
Pier Foundations ..................................................................................................... 69
12.5 Ductility and Displacement Capacity of Pier Foundations ................................... 70