Jack P. Moehle: Performance-Based Earthquake Engineering: A Chronicle in Five Easy Pieces

Introduction

This tutorial provides a comprehensive overview of Performance-Based Earthquake Engineering (PBEE), as discussed by Jack P. Moehle in his presentation. It outlines the key concepts, methodologies, and applications of PBEE, emphasizing its significance in assessing and designing structures to withstand seismic events. Whether you're a civil engineer, architect, or a student, understanding PBEE is crucial for modern earthquake engineering.

Step 1: Understand the Basics of Performance-Based Earthquake Engineering

• Performance-Based Earthquake Engineering is a method that quantifies a building's performance during earthquakes.
• It focuses on achieving specific outcomes rather than just following prescribed design methods.
• Outcomes can include metrics such as:
  • Structural strain and rotation
  • Damage levels
  • Casualties and repair costs
  • Functional recovery time

Step 2: Learn About the Origin in Displacement-Based Design

• Displacement-Based Design serves as the foundation for PBEE.
• This approach emphasizes the displacement of structural components during seismic events.
• Understanding displacement helps in predicting how structures will behave under different shaking intensities.

Step 3: Familiarize Yourself with Seismic Evaluation and Retrofitting

• Seismic evaluation involves assessing existing buildings for their earthquake resilience.
• Retrofitting refers to upgrading these buildings to improve their performance.
• Key considerations include:
  • Identifying vulnerabilities within the structure
  • Implementing reinforcing techniques and materials
  • Evaluating the cost-benefit of retrofitting versus new construction

Step 4: Explore Probabilistic Risk Assessment

• PBEE incorporates probabilistic methods to quantify the risk of loss due to seismic events.
• This involves:
  • Developing probabilistic models that predict potential damage and losses
  • Analyzing risk over time or under specific earthquake scenarios
  • Utilizing these models to inform decision-making for engineers and stakeholders

Step 5: Apply PBEE to New Building Designs

• Utilize PBEE principles when designing new structures.
• Focus on achieving desired performance metrics tailored to specific risks.
• Consider various factors such as:
  • Site conditions and seismic history
  • Material selection and structural systems
  • Long-term maintenance and repair plans

Step 6: Design for Repairability

• In the aftermath of an earthquake, repairability is crucial for minimizing downtime.
• Design strategies should include:
  • Choosing materials that are easier to repair or replace
  • Planning for accessibility during repairs
  • Ensuring that the design allows for quick assessments and repairs post-event

Conclusion

Performance-Based Earthquake Engineering is an essential approach for modern seismic design and assessment. By understanding its principles, from the origins in displacement-based design to its application in new construction and repairability, engineers can significantly enhance the resilience of structures against earthquakes. To deepen your understanding, consider exploring further resources on seismic design standards and participating in relevant workshops or seminars.