International Research Journal of Engineering and Technology (IRJET) e-ISSN: 2395-0056 Volume: 11 Issue: 07 | July 2024
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p-ISSN: 2395-0072
The study of the fundamental natural time period of the AAC block infill wall under seismic conditions Mohit Rathod, Kishan Jayswal2, Aakash Suthar3 1M. Tech Student, L.J. University, Ahmedabad.
2Kishan Jayswal, Assistant Professor, Civil Engineering Department, L.J. University, Ahmedabad, Gujarat, India. 3 Aakash Suthar, Assistant Professor, Civil Engineering Department, L.J. University, Ahmedabad, Gujarat, India ---------------------------------------------------------------------***---------------------------------------------------------------------
Abstract – Infill walls play a crucial role in modern building construction, contributing to structural integrity, thermal performance, and aesthetic appeal. For high-rise buildings, AAC (Autoclaved Aerated Concrete) blocks are frequently used as masonry infill compared to traditional bricks. AAC blocks are lightweight, requiring less material for infill compared to standard bricks. Historically, masonry has been considered a non-structural element, and its impact on buildings under seismic loads has often been overlooked. However, recent studies have shown that infill wall panels significantly affect structural performance during earthquakes. Key parameters studied include base shear, story displacement, story drifts, frequency, and time period. This study focuses on the time period taken for AAC block infill in the seismic analysis of RC (Reinforced Concrete) buildings with masonry infill, based on IS 1893:2016 (Part 1). The strength and stiffness of masonry infill are calculated using the diagonal strut method, as specified in the earthquake resistance code IS 1893:2016 (Part 1). The research analyzed 28 models of 4, 8, and 12 stories, along with one realistic model of an RC frame, in three scenarios: bare frame, brick infill, and AAC block infill. Two configurations were considered: one with only columns and the other with a combination of columns and shear walls. The models were further analyzed for seismic performance using response spectrum analysis in CSI ETABS software, considering the strength and stiffness of the infill walls using the diagonal strut method, as per clause 7.9.2 of IS 1893:2016 (Part 1).
more rigid compared to bare frames. Ignoring the contributions of infill walls has led to the failure of many multi-story buildings.
Key Words: Time period, Bricks infill, AAC Block infill. Modal periods, RC frame, bare frame, Response spectrum analysis
Research work aims to know which fundamental period formula as per earthquake resistance code (IS:1893 (part-1):2016) is used for the with infill (AAC block) structure’s Seismic Analysis
Infill walls, traditionally placed between structural elements, are now seen as vital for enhancing a building's structural stability and energy efficiency. The selection of materials and design of infill walls can greatly influence a building's loadbearing capacity, thermal insulation, and sustainability. Introducing ion-based materials offers a novel approach, inspired by the unique properties of ions, to potentially improve the structural and thermal performance of infill walls
Fig -1.1: (A)Bare frame and (B) infill frame 1.1 Aim
1.INTRODUCTION
1.2 Objective
Reinforced concrete and steel buildings often incorporate masonry infills, which fill the spaces between the building's vertical and horizontal structural elements. Traditionally, these infills are assumed to be non-contributory to the building's load resistance, whether axial or lateral, and thus are typically excluded from structural analysis. This oversight is partly due to the lack of straightforward and realistic analytical models for infills. However, infill walls significantly enhance the strength and rigidity of structures. It has been observed that frames with infills are stronger and
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1.Determine the Time Period Formula: Identify the specific formula used to calculate the time period for infill (AAC block) in RC and MRF buildings according to the earthquake resistance code (IS 1893:2016 Part 1). 2. Compare Bare Frame and Infill Wall Behavior: Evaluate whether the behavior of a bare frame is the same as that of a frame with infill walls using AAC blocks as infill materials.
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