NEHRP Clearinghouse

Evaluation of the Seismic Performance of a Thirty-Story RC Building.
National Science Foundation, Washington, DC.; California Universities for Research in Earthquake Engineering, Richmond., July 1991, 260 p.
Identifying Number(s)
The report presents the results of a series of studies to evaluate the seismic performance of a 30-story ductile moment-resistant reinforced concrete frame structure. This building, which is the tallest reinforced concrete building in Northern California, is founded on piles and has a plan which consists of three equally spaced wings extending outward approximately 112 ft from the central core. At the time of the Loma Prieta earthquake, the building was instrumented with 21 accelerometers. In addition, free-field recording stations were located on the north and south sides of the building. Inspection of the building after the earthquake did not reveal any significant damage or yielding of the reinforcing steel. In addition to the recorded response, results from ambient and forced vibration tests that were performed on the building prior to occupancy in 1985 are also available. Linear elastic and nonlinear dynamic response analyses were conducted using both simplified and detailed analytical models. Results are presented in terms of response spectra, response history comparisons and maximum response envelopes. The main objectives were: (1) to evaluate the reliability of the present system identification techniques for obtaining the building dynamic characteristics from recorded responses; (2) to evaluate the accuracy of current analytical modeling techniques; (3) to evaluate the influence of modeling discretizations on the computed response; (4) to evaluate the validity of current code requirements; (5) to compare current U.S. and Japanese design procedures and requirements for this type of building; and (6) to analyze probable performance under more severe base motions.
Soil-structure interactions; Earth movements; Structural members; Elastic analysis; Fourier transformation; Earthquake damage; Ductility; Building codes; Earthquake engineering; Reinforced concrete; Loma Prieta Earthquake; Seismic effects; Displacement; Spectrum analysis; California; Framed structures; Dynamic structural analysis; Dynamic response; Earthquake resistant structures; Loads (Forces); Structural vibration; Concrete structures