Effects of column-base and foundation rotational flexibility on the dynamic response of a column
Abstract
Dynamic response of a single-story column where rotational stiffnesses for the column-foundation interface and for the foundation-soil interface are considered is studied. The study is based on three analytical models that represent different base conditions. Two basic dynamic loading patterns are investigated. The purpose is to investigate and define characteristics of the response that could aid in understanding the response of real building structures with foundation on soil under dynamic loads. It is shown how the considered rotational stiffnesses affect the column distortion, column base rotation, and foundation rotation response, and how sensitive the characteristic response is to the system parameters such as mass and column lateral stiffness. The analytical models allow the analysis to be carried over a large range of materials, structural characteristics, and loading cases. The current study focuses on a single-story, undamped linear-elastic concrete structure, where the floor slab and the foundation mat are considered as rigid and supported by linear-elastic soil. Results from previous researchers indicate lower column distortion response when the rotational degrees of freedom are considered, compared to the response of the structural system with fixed columns, and therefore favorable. Though during this study results that involve a higher response of the degrees of freedom, and hence detrimental for the system design, were found as well.
Degree
M.S.C.E.
Advisors
Bobet, Purdue University.
Subject Area
Civil engineering
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