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Civil-Comp Proceedings
ISSN 1759-3433
CCP: 93
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Paper 350

Investigation of the Seismic Behaviour of Masonry Infilled Frames

M. Foroughi1, M.A. Barkhordari2 and S.M. Aqaee1

1Civil Engineering Department, Islamic Azad University-Yazd Branch, Iran
2Civil Engineering Department, Iran University of Science and Technology, Narmak, Tehran, Iran

Full Bibliographic Reference for this paper
M. Foroughi, M.A. Barkhordari, S.M. Aqaee, "Investigation of the Seismic Behaviour of Masonry Infilled Frames", in , (Editors), "Proceedings of the Tenth International Conference on Computational Structures Technology", Civil-Comp Press, Stirlingshire, UK, Paper 350, 2010. doi:10.4203/ccp.93.350
Keywords: masonry, mixed structure, infilled frame, finite element, strengthening.

Investigations show that about 80% of structures in Iran are masonry structures. In some of these structures, known as mixed structures, there are steel frames in the middle region. Evidence from past earthquakes has shown that these structures are more vulnerable than common masonry buildings, when an earthquake occurred [1,2,3,4].

Further investigations have shown that, their vulnerability results from the lack of required wall and different seismic behavior between steel frames and masonry walls. This would cause different seismic modes in buildings and would cause the collapse of the buildings [5,6,7]. Researchers have suggested various methods for rehabilitation of these structures. One of these is to use masonry infilled walls in existing steel frames [8].

The authors have conducted research on the effect of added masonry infill for existing steel frames in mixed structures under cycling loading [9]. In this investigation, we employed the finite element method considering the nonlinear behaviour of materials. Two methods of finite element modeling are common in the modelling of masonry walls: micro modelling and macro modelling. Although micro modelling is more accurate, it needs complex and intensive calculations. In order to make the research less time consuming and less expensive we used the macro modelling method. Studies have demonstrated that with appropriate assumptions for homogenizing materials, results would have an acceptable accuracy. In order to certificate the modeling, an experimental specimen investigated by Mosalam et al. [10], is modelled in a similar procedure. The results show a good agreement.

In this research, the behavior of steel frames under cyclic load was investigated. Then the effect of adding masonry infilled with different thicknesses and strengths was investigated. Results show that adding infilled walls increases the stiffness and energy damping capacity of the system. Then the effect of the opening and its location was investigated. Also, the effect of shotcrete performance and adding reinforcing steel mesh was studied and desirable behaviour was found. This paper introduces this investigation and its results.

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K.M. Mosalam, R.N. White, P. Gergely, "Seismic evaluation of frames With infill walls using quasi-static experiments", Technical Report NCEER- 97-0019, National Center for Earthquake Engineering Research, State Univ. of N.Y. at Buffalo, 1997.

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