Outrigger system performance is afected by outrigger locations throughout the height of a building, the number of outrigger levels provided, their plan locations, the presence of belt trusses to engage adjacent perimeter columns versus standalone megacolumns, outrigger truss depths, and the primary structural materials used. Understanding Outrigger Systems An outrigger system is a structural configuration employed in tall buildings to enhance lateral stability. It involves the use of horizontal trusses or beams, known as outriggers, that connect the building's core (typically containing elevators, stairs, and services) to the exterior columns or walls.
The outriggers tie together the core and the perimeter structural system creating a unique design providing solutions to high-rise construction problems. Some of the features of the outrigger structural systems are. Damped Outriggers Design Guide Introduction This document addresses the use of damped outriggers to mitigate wind effects on tall buildings.
Traditionally, outriggers are used in tall buildings to shed overturning loads from a central core to perimeter columns. Outrigger systems enhance the structural efficiency of high-rise buildings since the 1980s, replacing tubular frames. This guide aims to establish design recommendations for outrigger systems in tall buildings.
Core-and-outrigger systems can reduce core overturning moments by up to 60% and lateral displacements significantly. Outrigger systems are rigid horizontal structures designed to improve a building's stability and strength by connecting the building core or spine to distant columns, much in the way an outrigger can prevent a canoe from overturning. Outriggers have been used in tall, narrow buildings for nearly 500 years, but the basic design principle dates back centuries.
In the 1980s, as buildings grew. In the conventional design, the outrigger is designed to be a story height truss. 2.2 Concrete Outriggers The benefit of concrete outrigger system verses steel is high stiffness and lowcost.
Under wind load cases, the outrigger system needs to be of stiff concrete deep beam or of concrete wall which can be easily achieved by this. Abstract - High-rise building design and construction require innovative structural systems to guarantee stability and withstand lateral stresses, especially in areas vulnerable to strong winds or seismic activity. With their ability to improve stiffness and decrease lateral displacements, outrigger systems have become an essential structural component in the design of tall buildings.
The. Outrigger systems have been widely used in super tall buildings constructed since the 1980's, eclipsing previously favored tubular frame systems. However, outriggers are not listed as a seismic lateral load resisting system in any code.
Design guidelines are not available. The CTBUH formed the Outrigger Working Group to develop the first. Outrigger system can easily be combined with other structural systems in high-rise buildings, such as: (i) tube-in-tube system and single frame tube system; (ii) stand-alone core with mega-columns; and (iii) other systems.
The outriggers are the key components in the economic and efficient design of high-rise buildings. Coupling the perimeter frame with core's shear wall increases.