Abstract
An analytical approach is described for performing seismic evaluation of welded steel moment frame buildings constructed prior to the 1994 Northridge earthquake. The approach is based on an analytical model that captures the possibility of connection fracture and the subsequent loss of strength and stiffness. This connection model was developed and calibrated on the basis of laboratory experiments. It was employed in the seismic analysis of a 13-story building which experienced fractured connections in the Northridge earthquake and for which there are seismograph records and a damage survey. Results from several analyses indicate that the inelastic and fracture models are capable of predicting the behavior of steel moment frame buildings and of estimating the level of damage.
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