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Earthquakes and Structures
  Volume 5, Number 3, September 2013, pages 277-296

Seismic progressive collapse assessment of 3-story RC moment resisting buildings with different levels of eccentricity in plan
Somayyeh Karimiyan, Abdolreza S. Moghadam and Mohammad G. Vetr

    Margin of safety against potential of progressive collapse is among important features of a structural system. Often eccentricity in plan of a building causes concentration of damage, thus adversely affects its progressive collapse safety margin. In this paper the progressive collapse of symmetric and asymmetric 3-story reinforced concrete ordinary moment resisting frame buildings subjected to the earthquake ground motions are studied. The asymmetric buildings have 5%, 15% and 25% mass eccentricity. The distribution of the damage and spread of the collapse is investigated using nonlinear time history analyses. Results show that potential of the progressive collapse at both stiff and flexible edges of the buildings increases with increase in the level of asymmetry in buildings. It is also demonstrated that \"drift\" as a more easily available global response parameter is a good measure of the potential of progressive collapse rather than much difficult-to-calculate local response parameter of \"number of collapse plastic hinges\"
Key Words
    asymmetric buildings; progressive collapse; mass eccentricity; reinforced concrete ordinary moment resisting frame building; nonlinear time history analysis; flexible edge; stiff edge
Int\'l Institute of Earthquake Eng. and Seismology (IIEES), No. 21, Arghavan St., North Dibajee, Farmanieh, Tehran, Iran

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