Evaluation of the Robustness of Tall Buildings with Bundled Tube Resistant Skeleton using Fragility Curves

Document Type : Research Article


1 M.Sc. Graduate

2 Professor, Faculty of Engineering, Kharazmi University


This research assesses the seismic resilience of structures with a lateral load-resisting system including moment frames and internal simple frames using statistical methods and probabilistic functions. For this purpose, two structures of 24 and 48 stories with bundled tube resistant system were considered. The structural system of the studied models consists of nine integrated rigid cells. The studied bundled tube structures have been designed based on the sixth and tenth issues of the Iranian National Building Code (INBC) and the fourth edition of the Iranian Seismic Code (Standard No. 2800).The seismic behavior of the studied bundled tube structural systems is investigated in this paper by performing incremental dynamic analyses (IDA) and seismic fragility assessments under near-field ground motions with various directivity effects. The fragility curves of the studied structures have been plotted according to the FEMA provisions to calculate the probability of the resistant skeleton exceeding six seismic performance levels, namely the post-linear (PL), the immediate occupancy (IO), the damage control (DC), the life safety (LS), the collapse prevention (CP) and the probabilistic global instability (GI). Then, by determining the damage coefficients according to the HAZUS 2005 guidelines and applying the proposed formulation of the loss function by the MCEER-09-0009 report, the seismic resilience indexes of the studied structures were obtained.Based on the obtained results of the conducted nonlinear dynamic analyses, it was concluded that the 24 and 48-story studied bundled tube structures have a relatively sufficient safety margin against the probable collapse mode under near-field records containing velocity pulses. Moreover, the evaluation of the probabilistic values of occurrence of the various limit states for the studied structures shows that the bundled tube structural system can control the gradual process of stiffness deterioration and strength degradation with a more comprehensive formation of the geometric nonlinear behavior.The results of the performed fragility analyses indicate that the application of bundled tube resistant skeleton in high-rise buildings can provide a high capability of dynamic stability against the process of damage expansion. The robustness indexes of the 24 and 48-story studied bundled tube structures were also obtained as 83.6% and 84.8%, respectively. Based on the seismic resilience calculations, it was found that the 48-story studied structure loses a lower amount of strength and efficiency after strong earthquake tremors.


Main Subjects

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