Observations on Structural Poundingby Vitelmo V. Bertero, Univ of California, Berkeley, CA, USA,
Abstract: In over 40% of the collapsed or severely damaged buildings in Mexico City, pounding of adjacent buildings occurred, and in at least 15% was the primary cause of collapse. The main objectives of this paper are to identify and discuss the primary causes of pounding of adjacent engineered buildings; and to assess their observed performance in regard to improving the earthquake-resistant design and construction of new adjacent buildings and retrofitting existing ones where separation appears to be inadequate. The primary cause for the severe pounding was the insufficient separation between these adjacent buildings and the main reasons for this insufficiency are identified. Comparison of Mexico and U. S. earthquake regulations indicates that if buildings would be designed and constructed to satisfy just the minimum code requirements, and if ground motions like those recorded at SCT could occur in the U. S. cities, the problem of pounding between adjacent buildings located in soft soils could be even more serious in the U. S. than in Mexico City.
Subject Headings: Earthquake resistant structures | Ground motion | Developing countries | Building codes | Dynamic structural analysis | Seismic design | Urban areas | Mexico City | North America | Mexico
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