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Earthquakes and Structures
  Volume 1, Number 3, September 2010, pages 231-252

Pounding-involved response of isolated and non-isolated buildings under earthquake excitation
Sayed Mahmoud and Robert Jankowski

    Previous research on pounding between seismically isolated buildings during earthquakes has been focused on impacts at the bases of structures and the effect of simultaneous interactions at the bases and at the superstructures has not been studied in details. In this paper, the seismic responses of adjacent buildings supported on different or similar base systems considering impacts between bases and superstructures are numerically investigated. The study is carried out in three parts for the two types of adjacent buildings: (i) both structures have fixed bases; (ii) one structure has fixed base and the other is seismically isolated and (iii) both structures have base isolation systems. The results of the study indicate that the pounding-involved responses of the buildings depend mainly on the type of structural base systems and on the structural parameters of both buildings. For the base-isolated building, the variation of the peak accelerations and displacements of the storeys have been found to be relatively low. On the other hand, significant differences have been observed for the fixed base building. The results of the parametric study conducted for different values of the gap size between colliding structures show the reduction in the peak base displacements as the gap distance decreases.
Key Words
    structural pounding; earthquakes; seismic isolation; nonlinear modelling.
Sayed Mahmoud: Faculty of Engineering at Mataria, Helwan University, 11718 Cairo, Egypt
Robert Jankowski: Faculty of Civil and Environmental Engineering, Gdansk University of Technology
ul. Narutowicza 11/12, 80-233 Gdansk, Poland

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