Determination of Equivalent SDOF Characteristics of 3D Dual RC Structures

Abstract eng:
The recent drive for the use of a single-degree-of-freedom representation in displacement-based design and assessment of 3D reinforced concrete (RC) structures has significantly increased the demand for the determination of equivalent SDOF characteristics of such buildings. Nonlinear static analyses are frequently used to describe the response of a structure with reduced computational effort with respect to nonlinear dynamic analyses. The response parameters of interest include the mechanical SDOF characteristics such as yield period, deformed shape etc. However, the inherent irregularities and uncertainties of existing RC buildings render the SDOF representation rather difficult and more demanding. The main focus of this study is on existing dual (frame-wall) structures; 4 case study RC buildings from the existing Turkish building stock have been modelled in 3D using a fibre-based finite elements software. Displacement-based adaptive pushover (DAP) analyses have been conducted in both directions of the buildings. The DAP capacity curves have been used to extract the yield periods, deformed shapes, and effective heights of the case study buildings in order to define the SDOF characteristics of dual structures for use in displacement-based assessment.

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