SEISMIC DESIGN OF BRIDGES - DESIGN EXAMPLE NO. 1: TWO-SPAN CONTINUOUS CIP CONCRETE BOX BRIDGE

This document describes one of seven seismic design examples that illustrate "how" to apply the American Association of State Highway and Transportation Officials' (AASHTO's) seismic analysis and design requirements on actual different bridge types across the United States. Each provides a complete set of "designer's notes" covering the seismic analysis, design, and details for that particular bridge, including flow charts, references to applicable AASHTO requirements, and thorough commentary that explains each step. In addition, each example highlights separate issues (skew effects, wall piers, elastomeric bearings, pile foundations, etc.). This document describes the fourth example, a 320 ft (98 m) reinforced concrete box girder three-span skewed bridge in the western United States with spread footing foundations, SPC-C & A = 0.30g.