DESIGN SPECIFICATIONS FOR HIGHWAY BRIDGES - IISEE

CONTENTS
Chapter 1 General ........................................................................................ 1
1.1 Scope .......................................................................................................................... 1
1.2 Definition of Terms .................................................................................................... 1
Chapter 2 Basic Principles for Seismic Design ............................................ 4
2.1 Fundamentals of Seismic Design .............................................................................. 4
2.2 Principles of Seismic Design ..................................................................................... 4
2.3 Classification of Importance of Bridges .................................................................... 5
Chapter 3 Loads to be considered in Seismic Design .................................. 6
3.1 Loads to be considered in Seismic Design and their Combinations ........................ 6
3.2 Effects of Earthquake ................................................................................................ 6
Chapter 4 Design Earthquake Ground Motions .......................................... 7
4.1 General ....................................................................................................................... 7
4.2 Level 1 Earthquake Ground Motion ......................................................................... 7
4.3 Level 2 Earthquake Ground Motion ......................................................................... 8
4.4 Modification Factor for Zones ................................................................................. 10
4.5 Ground Type for Seismic Design ............................................................................. 11
4.6 Ground Surface to be considered in Seismic Design .............................................. 11
Chapter 5 Verification of Seismic Performance ......................................... 12
5.1 General ..................................................................................................................... 12
5.2 Limit States of Bridges for Seismic Performance Level 1 ..................................... 12
5.3 Limit States of Bridges for Seismic Performance Level 2 ..................................... 12
5.4 Limit States of Bridges for Seismic Performance Level 3 ..................................... 13
5.5 Basic Principles to Verify Seismic Performance ..................................................... 13
5.6 Unseating Prevention Measures of Bridge Superstructure .................................. 13
Chapter 6 Verification Methods of Seismic Performance Based on
Static Analysis ........................................................................... 14
6.1 General ..................................................................................................................... 14
6.2 Calculation Methods of Loads in Static Analysis ................................................... 14
6.2.1 General ........................................................................................................... 14
6.2.2 Inertia Force ................................................................................................... 15
6.2.3 Calculation Method of Natural Period .......................................................... 15
6.2.4 Seismic Earth Pressure ................................................................................. 17
6.2.5 Seismic Hydrodynamic Pressure ................................................................... 18