34. Design Earthquake
The chapter highlights key concepts in earthquake-resistant design, focusing on the definition and implications of design earthquakes. Engineers aim to ensure safety and functionality by analyzing seismic hazards, design basis earthquakes, and site effects while incorporating local soil conditions and structural responses. It also discusses the evolution of seismic codes and performance-based design methodologies, emphasizing the importance of ductility, redundancy, and sustainability in design.
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What we have learnt
- The design earthquake encapsulates several factors including seismic intensity, site conditions, and the expected probability of occurrence.
- Seismic hazard analysis can be deterministic or probabilistic, influencing ground motion assessment for structures.
- Design considerations for earthquake resistance include structural ductility, soil interaction effects, and regularity in design to minimize dynamic response.
Key Concepts
- -- Design Earthquake
- A representation of the earthquake ground motion level that structures are designed to withstand with limited damage.
- -- Seismic Hazard Analysis
- Evaluation of potential seismic hazards using deterministic or probabilistic approaches to assess ground motion.
- -- Design Basis Earthquake (DBE)
- The ground motion level associated with a 10% probability of exceedance in 50 years for which a structure is designed to remain operational.
- -- Maximum Considered Earthquake (MCE)
- The most severe ground motion expected at a site, typically associated with a 2% probability of exceedance in 50 years.
- -- PerformanceBased Seismic Design (PBSD)
- An approach that aims to design buildings to limit damage across various seismic intensities rather than just preventing collapse.
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