BRIDGE MANUAL 5 - 1 SECTION 5: EARTHQUAKE RESISTANT DESIGN September 2004 Table of Contents 5.1 Design Philosophy ...................................................................................... 5-3 5.1.1 Objective.................................................................................................. 5-3 5.1.2 Background and Commentary ................................................................. 5-5 5.1.3 Structural Action ...................................................................................... 5-5 5.2 Design Earthquake Loading and Ductility Demand..................................... 5-6 5.2.1 Site Subsoil Categories............................................................................ 5-6 5.2.2 Horizontal Loading ................................................................................... 5-7 5.2.3 Displacement Ductility Factor................................................................. 5-14 5.2.4 Risk Factor, R ........................................................................................ 5-16 5.2.5 Structural Performance Factor ............................................................... 5-17 5.2.6 Vertical Seismic Response .................................................................... 5-17 5.2.7 Limitations on Displacement .................................................................. 5-17 5.2.8 P-Delta Effects....................................................................................... 5-18 5.3 Liquefaction .............................................................................................. 5-18 5.4 Analysis Methods ...................................................................................... 5-19 5.4.1 General .................................................................................................. 5-19 5.4.2 Equivalent Static Force Analysis ............................................................ 5-19 5.4.3 Dynamic Analysis................................................................................... 5-20 5.4.4 Member Properties for Analysis ............................................................. 5-21 5.4.5 Seismic Displacements .......................................................................... 5-22 5 Earthquake Resistant Design
Earthquake Resistant Design
May 19, 2023
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