Keywords: masonry, infill, frame, masonry infill, steel structure, shotcrete, rehabilitation, strengthening.

Incorporating masonry walls in framed structures including steel structures has been a common practice for years. In some cases these walls play the role of partitions with low stiffness. These walls do not have a considerable effect on the structural behaviour under lateral loads. The main structural concern with regards to masonry walls are the out of plane stability under lateral loads especially earthquake loads [1]. From a different viewpoint, solid masonry walls with considerable stiffness can have a positive effect on structural strength while inducing high earthquake loads at the same time arising from their weights. In general, these walls are viewed negatively by some experts. In recent decades, a wide range of research has been carried out with regard to these walls and their effects on structures. Previous investigations show that masonry walls can create positive or negative effects on structures depending on their characteristics and specifications. When retrofitting steel structures, solutions such as adding steel bracings, building steel or concrete shear walls, etc. are considered [2,3]. The authors carried out some research, investigating the addition of masonry infill in week low rise steel structures [4,5] and effects of strengthening by shotcrete and steel mesh. In this research, an innovative method of connecting the steel mesh to the columns was studied. The programs SAP [6] and ANSYS [7] were employed in this research. The purpose of this paper is to discuss the effect of shotcrete and steel mesh on masonry infill in steel frames. This research concludes that the introduction of steel mesh and shotcrete can significantly enhance the performance of masonry walls in framed structures.

1

K.M. Mosallam, 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.

2

H.A. Moghaddam, P.J. Dowling, "The state-of-art in filled frames", ESEE report, No 87-2, Imperial College, London, 1987.

3

A. Mohebkhah, A.A. Tasnimi, H.A. Moghadam, "A nonlinear-seismic model for brick masonry - infill panels with opening in steel frames", Department of Civil Engineering, Tarbiat Modares University, Tehran, Iran, 2007.

4

S.M. Aghaie Meybodi, "Investigation on Influence of use of filled Frame in Rehabilitation of Masonry Buildings with Centric Steel Frame", MSc thesis, directed by M. Foroughi, Department of Civil Engineering, Yazd University, Iran, 2009.

5

M. Foroughi, M.A. Barkhordari, S.M. Aqaee, "Investigation of the Seismic Behaviour of Masonry Infilled Frames", in B.H.V. Topping, J.M. Adam, F.J. Pallarés, R. Bru, M.L. Romero, (Editors), "Proceedings of the Tenth International Conference on Engineering Computational Technology", Civil-Comp Press, Stirlingshire, United Kingdom, paper 350, 2010. doi:10.4203/ccp.93.350

6

SAP2000, Integrated Finite Element Analysis and Design of Structures.

7

ANSYS 10 Tutorial (Help), ANSYS Release 10.0 Documentation.

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