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Earthquakes and Structures Volume 11, Number 3, September 2016, pages 461-481 DOI: http://dx.doi.org/10.12989/eas.2016.11.3.461 |
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Mechanical model for seismic response assessment of lightly reinforced concrete walls |
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E. Brunesi, R. Nascimbene and A. Pavese
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| Abstract | ||
| 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 | ||
| Address | ||
| 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 | ||