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
INVESTIGATING LATERAL RESPONSE VARIATIONS IN REINFORCED CONCRETE FRAMES WITH DIFFERENT TYPE OF CONCRETE Sandeep Kumar1, Mr. Ushendra Kumar2 1Master of Technology, Civil Engineering, Lucknow Institute of Technology, Lucknow, India
2Head of Department, Department of Civil Engineering, Lucknow Institute of Technology, Lucknow, India
---------------------------------------------------------------------***--------------------------------------------------------------------2. REINFORCED CONCRETE (RC) FRAMES IN Abstract - This research paper presents a comparative STRUCTURAL ENGINEERING analysis of four precast structural models subjected to dynamic loading, following IS 1893 Part 1:2016 guidelines. Using ETABS software, we developed four models with varying concrete grades: the first with all elements (beam, column, and slab) in M25-grade concrete; the second with beams and columns in M40-grade and the slab in M25grade; the third with all elements in M40-grade; and the fourth with beams and slabs in M40-grade and columns in M25-grade. Through dynamic analysis, we evaluated each model's seismic response, focusing on parameters like natural frequencies, mode shapes, and structural displacements. The study reveals the impact of different concrete grade combinations on the seismic performance of precast structures, providing insights to enhance their design and resilience against seismic forces.
Reinforced concrete frames are fundamental to modern structural engineering, providing the primary loadbearing skeleton for a wide range of buildings and infrastructure. RC frames owe their widespread adoption to their versatility, combining the compressive strength of concrete with the tensile strength of steel reinforcement. This synergy allows for enhanced load-carrying capacity and durability, making them a standard choice for both residential and commercial structures. The behavior of RC frames under various loading conditions, particularly lateral forces such as wind and seismic activity, is pivotal in ensuring their safety and functionality.
2.1.Traditional Use of Normal Concrete (NC)
Key Words: Lateral response, Reinforced concrete frames, Concrete types, Seismic performance, Structural resilience, Precast Concrete.
Normal concrete has long been the default material for constructing RC frames due to its availability, ease of handling, and predictable mechanical properties. It is typically mixed and poured on-site, which facilitates construction in varied conditions but can also lead to inconsistencies in quality due to environmental or operational variables. Despite these challenges, NC remains a robust material, particularly in static or lowdynamic loading environments. However, its performance under lateral loading, where stiffness, ductility, and energy dissipation become critical, demands meticulous design considerations.
1.INTRODUCTION Reinforced concrete (RC) frames have been a cornerstone of structural engineering, known for their durability, strength, and adaptability in various applications. Traditionally, normal concrete (NC) has been used in RC frames due to its accessibility and established performance characteristics. However, with advancements in construction techniques, precast concrete (PC) has gained traction for its efficiency in reducing on-site construction time, minimizing material wastage, and offering enhanced quality control. Despite these advantages, the lateral response of RC frames, a critical factor in ensuring structural stability during dynamic loading scenarios such as earthquakes and wind forces, may vary significantly between normal and precast concrete. This variation stems from differences in material properties, construction joints, and the inherent structural continuity of the two systems. Understanding these differences is essential to optimize design strategies and ensure safety, particularly in high-seismic or loadintensive environments. This research seeks to bridge the knowledge gap by investigating and comparing the lateral response variations in RC frames constructed with NC and PC.
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2.2.Emergence of Precast Concrete (PC) Precast concrete introduces a paradigm shift in construction practices by manufacturing concrete components off-site under controlled conditions. These precast elements are transported to the construction site and assembled, resulting in faster project timelines, reduced labor costs, and superior quality control. PC has garnered increasing interest for its potential to address urbanization-driven construction demands efficiently. However, PC systems differ structurally from NC systems due to the presence of construction joints and connectors, which can influence the overall lateral behavior of the frame.
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