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Earthquakes and Structures
  Volume 11, Number 3, September 2016, pages 461-481

Mechanical model for seismic response assessment of lightly reinforced concrete walls
E. Brunesi, R. Nascimbene and A. Pavese

    The research described in this paper investigates the seismic behaviour of lightly reinforced concrete (RC) bearing sandwich panels, heavily conditioned by shear deformation. A numerical model has been prepared, within an open source finite element (FE) platform, to simulate the experimental response of this emerging structural system, whose squat-type geometry affects performance and failure mode. Calibration of this equivalent mechanical model, consisting of a group of regularly spaced vertical elements in combination with a layer of nonlinear springs, which represent the cyclic behaviour of concrete and steel, has been conducted by means of a series of pseudo-static cyclic tests performed on single full-scale prototypes with or without openings. Both cantilevered and fixed-end shear walls have been analyzed. After validation, this numerical procedure, including cyclic-related mechanisms, such as buckling and subsequent slippage of reinforcing re-bars, as well as concrete crushing at the base of the wall, has been used to assess the capacity of two- and three-dimensional low- to mid-rise box-type buildings and, hence, to estimate their strength reduction factors, on the basis of conventional pushover analyses.
Key Words
    lightweight concrete wall; shear wall; sandwich panel; finite element model; multi-spring model; seismic response; strength reduction factor
E. Brunesi, R. Nascimbene: EUCENTRE, European Centre for Training and Research in Earthquake Engineering Via Ferrata 1, 27100 Pavia (PV), Italy

A. Pavese: Department of Civil Engineering and Architecture, University of Pavia Via Ferrata 3, 27100 Pavia, Italy

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