Seismic Design Guidelines for Upgrading Existing Buildings

摘要

The manual on seismic upgrade design guidance for existing buildings was developed as a sequel to the manual for new construction, TM 5-809-1/NAVFAC P-355.1/AFM 88-3, Chap 13, Sec. A, 'Seismic Design Guidelines for Essential Buildings.' The manual meets one of the objectives of the Earthquake Hazards Reduction Act of 1977 (Publication 95-124), i.e., to provide improved seismic design and construction requirements to upgrade existing buildings in seismic areas. The manual provides the seismic design upgrade concepts for existing buildings based on the state-of-the-art methodology and past practices by the triservices (Army, Navy and Air Force) and the private sector. It includes the dynamic-analysis approach similar to new construction concepts with some modifications/tolerances on the acceptance criteria. A methodology for screening, evaluating and prioritizing seismically hazardous buildings from a large number of buildings in a military installation and the Navy's Rapid Seismic Analysis Procedure are provided. For existing buildings in seismic zones 1 and 2, a static code procedure is provided to evaluate and upgrade resistance to collapse in the event of a major earthquake, as required by the code provision.