Performance based design of r/c tall buildings in two different seismic zones

Çiftçioğlu, Mustafa Güneş
Performance-based design of R/C tall structures has become mandatory with Turkish Earthquake Code (2018). While some professionals think that linear capacity design is sufficient, others have supported this new approach only in regions where earthquake is more effective. Nonlinear design requires comprehensive and detailed theoretical knowledge. The compatibility of Perform 3D software, widely used in this design, with experiment results is unknown and calibration is not mandatory in the regulation. It is another unknown to what extent calibration will change the design results. For this purpose, study was carried out on a tall structure with a height of 112 m above basement floor with flat slab, core-wall group and link beams. The design was made according to linear and nonlinear analysis for two different earthquake zones, i.e., Ankara and Istanbul. Necessity of nonlinear analysis in tall structures for both earthquake zones has been confirmed. In order to make the design compatible with experiments, calibration work was carried out for rectangular, T-shaped and U-shaped walls and diagonally and conventionally reinforced link beams. With calibration study, it was seen that cyclic degradation factors were very effective and numerical calibration results were given. The model concrete strain values of walls were very small from the experimental values. For this, the correction coefficient "a” and formulation for walls concrete strain results are proposed. Ideal wall mesh modeling has been proposed horizontally and vertically. The results of models with calibrated and 2 alternative uncalibrated cyclic degradation factors were compared, with results that were up to 30% lower in the absence of cyclic degradation factors. Low cyclic energy degradation factors are appropriate and sufficient for the design. As a result of all this study, some suggestions have been made for structural engineers and for some clauses of the Turkish Earthquake Code (2018).


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Citation Formats
M. G. Çiftçioğlu, “Performance based design of r/c tall buildings in two different seismic zones,” M.S. - Master of Science, Middle East Technical University, 2023.