International Refereed Journal of Engineering and Science (IRJES) ISSN (Online) 2319-183X, (Print) 2319-1821 Volume 3, Issue 3(March 2014), PP.26-31 Analysis of Masonry Infill In A Multi-Storied Building 1 S.Niruba, 2 K.V.Boobalakrishnan, 2 K.M.Gopalakrishnan, 1&2 Assistant Professor, Civil Engineering Department, Erode Sengunthar Engineering College, 3 Assistant Professor SG-I, Civil Engineering Department, Erode Sengunthar Engineering College, Abstract:- In many literatures, studies show that infills modify the behavior of framed structures under lateral loads; the contribution of panels is generally neglected in common structural analyses. The structural effect of brick infill is generally not considered in the design of columns as well as other structural components of RC frame structures. The brick walls have significant in-plane stiffness contributing to the stiffness of the frame against lateral load. The lateral deflection is reduced significantly in the infilled frame compared to the deflection of the frame without infill. It is observed that frames with infill produce much smaller deflections as compared to frames without infill. The results reflect the significance of infill in increasing the strength, stiffness and frequency, of the entire system depending on the position and amount of infilling. Lower infilling is noted to provide more stiffness for the system as compared with upper locations. A number of non-linear static (pushover) analyses were performed on proper structural models of the building, considering both bare framed structure and the infilled one, in order to appraise the influence of infill walls on the failure mechanisms. In particular, a sensitivity analysis was performed by assigning different Partial Safety Factors (PSF) to the mechanical parameters of infill walls, in order to investigate their effect on the overall structural response of the building. Keywords: Lateral loads, drift ratio, Roof displacement, Masonry infill, Deflection. I. INTRODUCTION Masonry is the building of structures from which individual units laid in and bound together by mortar; the term masonry can also refer to the units themselves. The common materials of masonry construction are brick, stone, marble, granite, travertine, limestone, cast stone, concrete block, glass block, stucco, and tile. Masonry is generally a highly durable form of construction. Various advantages have been acquired on analyzing the structures with infill, they are,  The use of materials such as bricks and stones can increase the thermal mass of a building.  Most types of masonry typically will not require painting and so can provide a structure with reduced life-cycle costs.  Masonry is very heat resistant and thus provides good fire protection.  Masonry walls are more resistant to projectiles, such as debris from hurricanes or tornados. Here also arise some of the disadvantages like,  Extreme weather causes degradation of masonry wall surfaces due to frost damage. This type of damage is common with certain types of brick, though rare with concrete blocks.  Masonry tends to be heavy and must be built upon a strong foundation, such as reinforced concrete, to avoid setting and cracking.  Save for concrete, masonry construction does not lend itself well to mechanization, and requires more skilled labour than stick-framing. In Euro code 6, six types of masonry units are defined: clay units, calcium silicate units, aggregate concrete units, autoclaved aerated concrete units, manufactured stone units and dimensioned natural stone units complied with the relevant European standards EN 771-1 to 6. However, brickwork can be combined from many of the following components: adobe, ashlars, blocks, bricks, bitumen, chalk, cement, lime and mortar. Depending on which materials are used, and how they are located, reinforced masonry (RM) walls can be divided into the following classes: confined masonry, reinforced cavity masonry, reinforced solid masonry, reinforced hollow unit masonry, reinforced grouted masonry and reinforced pocket type walls. Current Methods of Modeling Masonry Two main types of masonry models can be distinguished into: the micro- and the macro-modeling. In case of macro-models, the brick, the mortar and the joint is one homogeneous material that represents the behavior of the masonry. www.irjes.com 26 | Page