A Review on Performance of Outrigger Structural System in High Rise Buildings

With the increased migration of people from rural to urban areas due to better job opportunities and lifestyle, population of urban areas is increasing day by day hence land utilization is needed badly specially in big cities. High rise buildings are most helpful in utilizing the land effectively. Hence they are commonly used in urban areas to hold more population. But we know high rise buildings are highly vulnerable to lateral forces e.g. earthquake and wind. Now to make these high rise buildings safe against lateral loading many systems are used one of them is outrigger structural system. Outriggers are the structural members which connect the core of the building to the exterior column converting overturning moment into tension and compression. This paper summaries the concept, configuration, performance, problems and gaps of outrigger system in high rise buildings with the help of past researches to help understand outrigger system more effectively.