International Research Journal of Engineering and Technology (IRJET)
e-ISSN: 2395-0056
Volume: 10 Issue: 06 | Jun 2023
p-ISSN: 2395-0072
www.irjet.net
EFFECT OF STEEL BRACING ON SEISMIC PERFORMANCE OF REINFORCED CONCRETE (RC) FRAMED BUILDINGS Mir Tabish Altaf1, Arfat Rafiq2, Mubbasher Abbass3, Dr. Mohammad Umair4 1M.Tech student, Department of Civil Engineering, Jamia Millia Islamia, New Delhi, India
2M.Tech student, Department of Civil Engineering, Jamia Millia Islamia, New Delhi, India 3M.Tech student, Department of Civil Engineering, DBU, Punjab, India
, Department of Civil Engineering, Jamia Millia Islamia, New Delhi, India ---------------------------------------------------------------------***--------------------------------------------------------------------4Assistant Professor
Abstract - This research examines the seismic analysis of a
patterns within the building frame. These braces are typically installed in the form of X-shaped or Vshaped configurations. Diagonal bracing effectively transfers lateral forces between different parts of the structure, providing stiffness and reducing deformations during seismic events. It offers good overall stability and is often used in steel and timber structures.
15-storey reinforced concrete structure using various bracing techniques. Using SAP 2000 software, a G+14 building is assessed for seismic zone V in accordance with IS 1893: 2016. To assess the impact of the bracings in various stories, a nonlinear time history analysis was performed. Lateral displacement, story drift, base shear, and time period are the primary factors taken into account in this seismic study of buildings. According to the investigation, the X-type of steel bracing greatly increases a building's stiffness and decreases its maximum story drift and lateral displacement. In accordance with the findings, steel angle section outperforms steel I section and steel tube section in terms of performance.
2. Chevron Bracing: Chevron bracing is a type of diagonal bracing that involves a series of V-shaped braces arranged in parallel. The braces are connected at their vertices, forming a zigzag pattern across the frame. Chevron bracing provides efficient load transfer and stiffness while offering architectural flexibility. It is commonly used in steel structures and can be aesthetically pleasing, as the pattern can be visible on the building's exterior.
Key Words: Retrofitting, Steel Bracings, Steel sections, Time history analysis, Displacement, Storey drift, Base Shear, Time periods.
1. INTRODUCTION
3. Buckling-Restrained Bracing (BRB): Bucklingrestrained bracing is a specialized type of bracing that utilizes steel members encased in a ductile material, such as concrete or steel tubes filled with concrete. This bracing system is designed to prevent buckling and maintain its load-carrying capacity during seismic events. BRBs offer excellent energy dissipation capabilities, allowing them to absorb and dissipate seismic forces effectively. They are commonly used in both steel and reinforced concrete structures.
Reinforced concrete framed buildings are commonly used in construction due to their strength and durability. However, they can still be vulnerable to lateral forces induced by earthquakes. One approach to mitigate these forces and improve the seismic performance of such buildings is to introduce steel bracing systems. Steel bracing consists of steel members strategically placed within the structure to provide additional strength and stiffness. These braces can absorb and redistribute the energy generated during seismic events, reducing the lateral displacements and improving the overall structural response.
1.1.1
ADVANTAGES OF STEEL BRACING 1.
Steel bracing significantly enhances the lateral strength and stiffness of a structure, making it more resistant to seismic forces.
2.
These bracings are economic to use.
3.
Easy to erect and occupies less space.
4.
Does not significantly add to the structural weight of the building.
1.1 TYPES OF BRACING There are several types of bracing commonly used in structural engineering to improve the seismic performance of buildings. These bracing systems are designed to resist lateral forces induced by earthquakes and enhance the overall stability of the structure. Here are brief explanations of three commonly employed types of bracing: 1. Diagonal Bracing: Diagonal bracing consists of inclined structural members that form diagonal
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