Purpose of the Provisions FEMA 302 Section 1.1 “The design earthquake ground motion levels specified herein could result in both structural and nonstructural damage. Life safety (+some damage control) at 10% in 50 year event (nominally) Performance Levels Hazard Levels Incipient CollapseĪSCE 7-05 Seismic Provisions - A Beginner's Guide to ASCE 7-05ĭesign Objective Defined A specific performance level given a specificĮarthquake hazard level Stated basis of current codes: Otherwise, all the wealth of the world would prove insufficient… We must also face uncertainty on a large scale… In a way, earthquake engineering is a cartoon… Earthquakes systematically bring out the mistakes made in design and construction, even the minutest mistakes.” Newmark & Rosenblueth ASCE 7-05 Seismic Provisions - A Beginner's Guide to ASCE 7-05 “In dealing with earthquakes we must contend with appreciable probabilities that failure will occur in the near future.
High Uncertainty Importance of Details Of “Failure” “Failure” redefined to permit behavior (yielding) that would be considered failure under other loads. Bart Quimby, P.E., F.ASCE Quimby & Associates ASCE 7-05 Seismic Provisions - A Beginner's Guide to ASCE 7-05Įarthquake Protective Design Philosophical Issues High probability ASCE 7-05 Seismic Provisions A Beginner’s Guide to ASCE 7-05 Dr.