Experimental investigations were conducted to evaluate the lateral load-deflection characteristics of lightgage steel stud/gypsum wallboard panel combinations subjected to lateral cyclic loads. In all, six 8′ × 8′ specimens were tested. A reasonable one-to-one correspondence between the strap area increase and the increase in the contribution from the strap to the overall loadcarrying capacity of the panel at intermediate and high drift ratios was observed. The panel lateral stiffness for a given stabilized cycle degraded by about 7% to 15% as compared with the lateral stiffness of the corresponding virgin cycle. Lateral stiffness degradation increased as the drift ratios became larger. The energy dissipation ability of the panels in the stabilized cycle was about 60% of the virgin cycle. An average value of equivalent viscous damping for all the cycles based on panel hysteretic behavior was about 12%.
At 8:07 AM MDT, October 28, 1983, a major earthquake (Ms = 7.3) rocked central Idaho. The earthquake source zone was near the base of Mt. Borah with an elevation of 12,662 ft (3859 m). This earthquake is the largest earthquake to occur in Idaho in recorded history, and is the strongest to occur in the continental United States since the magnitude 7.1 Hebgen Lake Montana earthquake of 1959. It was felt that a study of the effects of such a large magnitude earthquake on buildings and communities would enhance understanding of the response of buildings to different types of earthquakes. Therefore, an EERI reconnaissance team was dispatched to the earthquake area on the day following the event. Performance of buildings and other structures near the earthquake source zone is discussed.
The response of masonry infills during the 1994 Northridge, California earthquake is described in terms of three categories; (1) lowrise and midrise structures experiencing large near field seismic excitation, (2) lowrise and midrise structures experiencing moderate far field excitation, and (3) highrise structures experiencing moderate far field excitation. In general, the infills provided a positive beneficial effect on the performance of the buildings, even those experiencing large peak accelerations near the epicenter. Varying types of masonry infills, structural frames, design conditions, and construction deficiencies were observed and their performance during the earthquake indicated. A summary of observations of the performance of infills in other recent earthquakes is given. Comparison with the Northridge earthquake is made and expected response of infill structures in lower seismic regions of the central and eastern United States is discussed.
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