International Research Journal of Engineering and Technology (IRJET)
e-ISSN: 2395-0056
Volume: 12 Issue: 05 | May 2025
p-ISSN: 2395-0072
www.irjet.net
THE INFLUENCE OF MASONRY INFILL WALLS ON THE SEISMIC RESPONSE OF RCC FRAME STRUCTURES: A REVIEW Manan Vyas1, Aakash Suthar2 1Manan Vyas , M.Tech Student, L.J. University, Ahmedabad 2Aakash Suthar, Professor, Structural Engineering Department, L.J. University, Ahmedabad, India.
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Abstract - The study conducts a THE INFLUENCE OF
of bracing, effectively increasing the overall stiffness and energy dissipation capacity (toughness) of the structure. This is achieved through their ability to resist in-plane shear forces and their behaviour as diagonal compression struts, transferring lateral loads between the columns and beams of the frame. However, a significant portion of existing reinforced concrete and steel buildings are designed based on simplified models that primarily consider uniformly distributed loads (UDL) acting on the beams, representing the self-weight and superimposed dead and live loads. Such modelling approaches, especially within software like ETABS when infills are not explicitly included, fail to capture the crucial bracing action, stiffness contribution, and enhanced toughness provided by the infill walls. This oversight in modelling can result in structural designs that are unnecessarily conservative, leading to potentially uneconomical solutions with predicted structural behaviour that deviates significantly from the actual performance of the built structure. Conversely, it can also lead to an underestimation of critical stresses and deformations in certain members if the stiffening effect of the infill is not accounted for. When infill walls are appropriately modeled, their inherent properties exert a major influence on key seismic performance parameters, including natural period, mode shapes, load distribution, and ultimately, the internal forces within the structural elements. Therefore, for the accurate and economical design of earthquake-resistant structures, a more comprehensive approach that gives due consideration to the structural contribution of masonry infill walls is essential to ensure both the safety and structural integrity of buildings subjected to seismic hazards.
MASONRY INFILL WALLS ON THE SEISMIC RESPONSE OF RCC FRAME STRUCTURES: A REVIEW. This literature review synthesizes existing research on the seismic performance of Reinforced Concrete (RCC) frame structures, with a particular focus on the often-overlooked contribution of masonry infill walls. While conventionally neglected in structural analysis, infills are recognized to significantly enhance the strength and rigidity of the frame by acting as bracing elements, increasing stiffness and toughness through in-plane shear resistance and diagonal strut action. The review examines how the consideration of infill walls in analytical models impacts the predicted seismic behavior of RCC frames. It compiles findings from studies that evaluate key performance parameters such as story displacement, story drift, stiffness irregularity, story strength, fundamental time period, and base shear, highlighting the discrepancies that arise when infill contributions are not accounted for. Ultimately, this review underscores the importance of appropriately modeling infill walls to achieve a more accurate and potentially economical design of earthquake-resistant structures, ensuring enhanced safety and structural integrity. Key Words: MASONRY INFILL , STRENGTH , RIGIDITY , STIFFNESS , TOUGHNESS , STORY DISPLACEMENT , STORY DRIFT, STIFFNESS IRREGULARITY, STORY STRENGTH.
1.INTRODUCTION The prevalent use of masonry infills in both reinforced concrete (RCC) and steel framed buildings is a wellestablished construction practice worldwide. These nonstructural elements, often treated as mere partitions or cladding, possess a significant yet frequently overlooked capacity to enhance the overall structural performance, particularly in resisting lateral loads. Despite their substantial contribution to the strength and rigidity of the structural frame, a considerable number of analyses and designs neglect the inherent stiffening and bracing effects provided by these infill walls. This simplification in structural modelling can lead to a potentially critical underestimation of structural vulnerabilities and the extent of damage that might occur during seismic events. In reality, masonry infill walls actively participate in the structural system's response to lateral forces. They function as a form
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Impact Factor value: 8.315
1.1 OBJECTIVE
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To investigate the seismic response of G+3, G+5, G+7, G+10, and G+14 Special Moment Resisting Frame (SMRF) structures under varying earthquake zones (III, IV, and V).
To analyze the effect of incorporating two major types of infill walls in the structural analysis and design of these SMRF structures using ETABS software.
To evaluate the influence of infill walls on key seismic performance parameters, including story
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