Ductility demand estimation of high-rise steel special moment frames due to structure-pile-soil interaction

ABSTRACT

This study is concerned with variation of ductility demands in a range of tall buildings comprising 15, 20, 25, and 30-story steel special moment frames resting on pile groups in a flexible soil medium. Nonlinear soil–structure interaction analysis is performed using the direct method by considering an adequate extent of soil around the structures terminating at appropriate boundaries. Eleven consistent ground motions are used for nonlinear dynamic analysis of the systems and the ductility demands are evaluated by tracing the rotation history of the plastic hinges. It is concluded that simultaneous contribution of soil–structure interaction and p-∆ effect results in more than 40% increase of the ductility demand and 20% increase of the story drifts in the worst case that includes the lower stories of the tallest building.

KEYWORDS:

• Ductility demand
• soil-structure interaction
• pile
• nonlinear dynamic
• high rise
• steel special moment frame

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Funding

The author(s) reported that there is no funding associated with the work featured in this article.