NEHRP Clearinghouse

Seismic Instrumentation of Existing Buildings.
Phan, L. T.
Public Buildings Service, Washington, DC. Office of Real Property Development., October 1990, 62 p.
Identifying Number(s)
Two existing GSA buildings, one in Long Beach, California and one in Portland, Oregon, were subjected to low-level vibration tests to determine their dynamic properties and response frequencies. The measured dynamic properties of the buildings were incorporated into the computer models of the buildings and time-history analyses using these models were performed. The purpose of the analyses is to reveal building response under these realistic earthquake excitations, so that logical seismic instrumentation schemes can be developed for these buildings. The results of the analyses suggest that the response of the Portland building is influenced more by torsional and rocking motions, while the response of the Long Beach building is influenced mainly by translational modes. From the observed behavior of the buildings, a seismic instrumentation scheme is developed for each building, and a general guideline for seismic instrumentation in existing building is recommended.
US GSA; Seismic design; Instruments; Computerized simulation; Earthquake engineering; Federal buildings; Portland (Oregon); Long Beach (California); Dynamic structural analysis