Bay Bridge Earthquake STEM Case Study

Investigate the famous infrastructure failure during the 1989 Loma Prieta Earthquake with this comprehensive, no-prep 6-page printable STEM Case Study Packet! Designed specifically for middle and high school classrooms, this multi-day unit provides an immersive, highly informative look at the iconic 1989 San Francisco-Oakland Bay Bridge Deck Collapse. By combining real-world geophysics, forensic engineering, applied mathematics, and public policy, this resource transforms a major natural disaster into a rich, interactive learning experience.

Throughout this unit, students explore critical secondary STEM concepts—including seismic ground acceleration, out-of-phase truss movement, anchor bolt shear forces, expansion joint bearing seat limits, and modern seismic retrofitting physics—in an accessible, highly engaging format.

What’s Included in this 6-Page Deep-Dive Packet:

• Page 1: Historical Case Study & Technical Breakdown

  Features a detailed historical narrative of the October 17, 1989 disaster during the World Series, detailing the double-deck cantilever truss design. Students learn about seismic S-wave propagation, anchor bolt shear mechanics, and bearing seat overhang limits before answering targeted comprehension check questions.

• Page 2: Day in the Life Scenario Challenge

  Students step into the shoes of a Lead Forensic Seismic Engineer on the morning after the collapse, October 18, 1989. In this realistic roleplay assignment, they analyze real-time earthquake telemetry, evaluate Peak Ground Acceleration (PGA) logs, and trace bridge span displacement diagnostics.

• Page 3: Hands-On Unplugged Simulation & Applied Math

  Brings earthquake engineering math into the classroom with clear, step-by-step problem sets. Students compute anchor bolt shear resistance capacities versus lateral seismic forces, calculate expansion joint seat lengths against ground displacement, and determine safety factor ratios.

• Page 4: Engineering Ethics & Workplace Dilemma

  Explores the trade-offs involved in public infrastructure planning. Students analyze the impact of deferring costly retrofits prior to 1989, balancing multi-million dollar budgets, evaluating earthquake probabilities, and prioritizing public transit safety.

• Page 5: Redesign Brief & Innovation Lab

  A creative blueprinting challenge where students act as modern structural engineers designing "Bay Bridge Seismic Retrofit V-2." Applying seismic design principles, they incorporate longitudinal tie-bars, hydraulic friction dampers, 30-inch seat extension ledges, and real-time accelerometers.

• Page 6: Teacher Answer Key & Scoring Rubric

  Includes complete, step-by-step solutions for all narrative comprehension questions and math calculations, along with a clear 10-point grading rubric to streamline assessment for the design blueprint assignment.

Teacher Benefits:

• 100% Unplugged & Copy-Paste Friendly: Clean layout with zero dark background boxes or awkward formatting, ensuring seamless editing in Google Docs, Word, or Canva.

• Multi-Day Classroom Value: Designed to cover 3 to 5 full class periods. Perfect for Physics, Physical Science, Earth Science, Civil Engineering, Architecture, CTE electives, or emergency sub plans.

• High-Interest Real-World Content: Combines real earthquake physics, structural shear math, forensic bridge inspection, state transportation policy, and seismic engineering redesign into one high-impact unit.