Case studies on foundation types of super high-rise buildings considering the soil deposit conditions

Abstract

Applying the super high-rise building design in geotechnical conditions is gradually increasing, and foundation types are evaluated under the condtions of economic and stable concepts to support this high load with safety. The foundation of a high-rise building is displaced by the building load, which influences the behavior of a super structure in reverse. In this aspect, the structural interaction analysis between a foundation and a super structure is necessary. In this study, the relationship of a superstructure of building and a foundation has been reviewed, considering the tendency of design from a capacity driven design to a performance design. The different case studies have been introduced to help understand this relationship in more specific, the first case is the high rise building founded on a raft system on rock and the second is that on piles on soft ground condition. In this study, a database for deciding the measured-to-predicted geotechnical parameters of foundation types in several soil deposit conditions is reviewed such as laboratory to in-situ tests. For this, the pile diameter, raft foundation depth, and the representative unconfined compressive strength of rock are investigated also to be the primary affecting factors on the building conditions. Based on the results of these investigations, it is shown that the prediction of the settlement, bearing capacity and pile installations in the mat is modified in the analysis with considering interface behavior in comparison with the analysis considering interface between mat and rock mass under the soil deposit conditions. Uncertainty of the measured-to-predicted geotechnical parameters associated with decision of foundation types also should be assessed in the future.