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Assessment of seismic rooftop acceleration demands in high-rise buildings


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Assi, Rola, Abo El Ezz, Ahmad et Zand Miralvand, Tania. 2018. « Assessment of seismic rooftop acceleration demands in high-rise buildings ». In 16th European Conference on Earthquake Engineering (Thessaloniki, Greece, June 18-21, 2018)

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The evaluation of seismic performance of acceleration-sensitive nonstructural components in buildings requires reliable prediction of the floor acceleration distribution along the height of the buildings. An accurate estimation of seismic acceleration demands is required in order to evaluate the potential seismic induced damage of anchorage, supports and bracing of these components and the corresponding probability of resulting financial losses. High-rise buildings located in seismic prone regions are particularly sensitive to amplified acceleration demands generated by long period ground motions and due to the significant contribution of higher modes to their response. Existing equations in the literature were mainly developed based on recorded accelerations in low to medium-rise instrumented buildings located in California. This paper examines the amplification of seismic rooftop accelerations of high-rise buildings with emphasis on their response to long period ground motions. Peak horizontal rooftop acceleration amplifications were assessed using recorded accelerations in 18 instrumented buildings having between 19 to 43 stories and subjected to the 2011 Tohuku earthquake in Japan. The average recorded peak rooftop acceleration amplification factors (AAF) defined as the average ratio of the peak floor acceleration (PFA) divided by the peak ground acceleration (PGA) range from 2.0 to 6.5 and exceed the values suggested in the NBCC 2015, ASCE 7-10, Eurocode and an equation suggested in the literature. This study showed the significance of considering the seismo-tectonic origin including the magnitude, distance and the level of input PGA for reliable seismic evaluation of acceleration-sensitive nonstructural components in buildings.

Item Type: Conference proceeding
Assi, Rola
Abo El Ezz, Ahmad
Affiliation: Génie de la construction, Autres
Date Deposited: 01 Mar 2021 20:45
Last Modified: 08 Nov 2021 17:15

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