International Research Journal of Engineering and Technology (IRJET) e-ISSN: 2395-0056 Volume: 11 Issue: 05 | May 2024
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p-ISSN: 2395-0072
A Review on Outriggers and Belt Truss System under Seismic Loading in RCC Building. Heet Rudani1, Mili Shankla2 1Post Graduate (M.E.) Student, L.J. University, Ahmedabad, India. 2
Mili Shankla, Assistance Professor, Civil Engineering Department, L.J. University, Ahmedabad, India.
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Outriggers are usually in the form of steel or wall in steel and concrete structures respectively, that acts effectively as a rigid head that creates some tension-compression in outer column. Belt trusses are often provided to distribute this tension-compression on exterior columns that provide strength for most of the exterior framing columns.
Abstract - This article provides a brief overview of the
Outrigger & Belt Truss system and explain its structural composition when lateral load is acting in modern high-rise buildings. The Outrigger is a solid beam that connects the shear or core wall to the outside column & Belt Truss are solid beams that connect the exterior columns. When this structure is subjected to lateral force, this system along with the column resists the rotation of the core so that it is significantly reduced lateral deflection and base shear that will occur in the free core. This study deals when and where to use an Outrigger & Belt Truss system in a RCC Building.
Outriggers can also be supported on mega columns at the perimeter of the building. Although this structure is mainly an internal system, arch tubes or mega columns offer a wide perimeter, thus counteracting the lateral push of the building's spread. In the concept, Outriggers are attached to the braced frame or sheared wall directly in the core. But it is not necessary for the column to be located on the outer edges of the building.
Key Words: Outrigger System, Belt Truss System, RCC Building, Base Shear, Lateral Deflection.
1.INTRODUCTION The construction of tall structures in urban environments is common in our country. Creating tall structures have become important due to accommodating commodity in the city, so the structure rises to the sky. With this, demand for security, safety, and maintenance of this facility have become important factor to its tenants due to the effects of wind and earthquakes. Therefore, it is imperative that tall structures require a surgical structural analysis before they are placed on the ground. As a result, creating an effective system with outrigger and belt truss becomes necessary for a building serviceability and stability. In places like Japan, Taiwan, and other Middle Eastern countries, tall buildings have become synonymous with economic growth and prosperity in the region. These countries also have something in common - they often experience destructive natural forces such as earthquakes, hurricanes and cyclones. Therefore, the job of a structural engineer is to find new innovative concepts to make tall structures safe, as a result they came up with Outrigger and Belt Truss System.
1.2 Belt Truss System As discussed, Belt trusses are often provided to distribute this tension-compression on exterior columns that provide strength for most of the exterior framing columns. So, in this concept, the structure that connects the core and the perimeter system is eliminated immediately and replaced by a belt truss with a combination of a rigid and strong diaphragm. The moment produced in the core is converted into a horizontal couple in top and bottom basement floors.
1.1 Outrigger System Outriggers are the most effective against lateral loads often used in high-rise buildings. The concept of bracing is used in ships it strengthens the mast of the ship to resist the force of the wind. Primarily tall structure resembles the master of his ship.
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