Seismic Performance Objectives for Tall Buildings: A Report for the Tall Buildings Initiative

摘要

The Pacific Earthquake Engineering Research Center is leading an initiative to develop guidelines for new high-rise construction that will meet intended safety and performance objectives following future earthquakes, particularly when alternative means of design are employed. An initial task of this initiative was to investigate the issues associated with identifying seismic performance equivalent to that achieved by code and whether a higher seismic performance should be targeted for these buildings. Many stakeholders were interviewed for this purpose, and a workshop was convened to discuss the results and to establish a direction for the technical design portions of the overall initiative. The investigation found that the establishment of a higher seismic performance objective for certain buildings was a public policy issue that should not be decided by engineering studies, but also that many owners, tenants, and other stakeholders did not understand standard code building-performance objectives and thought that even a small chance of collapse was unacceptable for any building. Many thought that even building closure due to damage should not be expected or tolerated and that seismic risk should be disclosed to owners and tenants in an understandable format.