by Juan C. De la Llera and Anil K Chopra
De la Llera, Juan C., and Anil K Chopra (1995). Evaluation of Seismic Code Provisions Using Strong-Motion Building Records From the 1994 Northridge Earthquake. SMIP95
Seminar on Seismological and Engineering Implications of Recent Strong-Motion Data, p. 25 - 40.
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In this investigation the recorded motions in eight buildings obtained during the 1994
Northridge earthquake are studied and used to evaluate seismic code provisions and conventional
building analysis techniques. These motions are first subjected to signal processing techniques
to identify important building properties such as vibration periods and story stiffnesses. Then,
the recorded ground motion in each building is used, in conjunction with a linear model of the
structure, to predict the dynamic response of the building. Such response is then compared with
the recorded response in order to assess the uncertainty present in the modeling procedure.
Besides, a recently proposed improved inelastic model, based on the use of ultimate story shear
and torque surfaces, is used to predict the response of buildings and explain conceptually their
seismic behavior. Finally, instrumentation and code issues are discussed in light of the results
generated in this research.