Probabilistic seismic performance evaluation of the steel frame buildings controlled with lead rubber bearings (LRBs)

Document Type : Research Article


1 Department of Civil Engineering, Faculty of Engineering, University of Maragheh, Maragheh, Iran

2 Maragheh university


Statistical and probabilistic analysis of structures is one of the appropriate methods to consider the effects of uncertainty and increase the reliability of the results obtained from the analysis. Fragility curve are one of the most effective methods for probabilistic evaluation and evaluation of structural performance. These curve show the probability of occurrence and occurrence of damage as a function of the seismic load applied to the structure. Incremental dynamic analysis (IDA) method is one of the most common analytical methods for drawing fragility curve. In this study, the seismic performance and probability of seismic performance of SAC project structures of 3 and 9 story under 22 pairs of fault records introduced in FEMA P695 will be investigated using OpenSEES software. The mentioned structures will be investigated using IDA for fixed base and isolated with lead-rubber bearing (LRB). Then, using IDA curve, a general mathematical relationship corresponding to the structural conditions for all levels of structural performance will be determined. Using these relationships, fragility curves of collapse performance levels for controlled and uncontrolled structures will be drawn. In order to evaluate the levels of different seismic intensities on the probabilistic performance of the isolated structure, collapse fragility curves are presented for three different levels of the intensities of the studied records. According to the fragility curves drawn, in addition to the effect of different seismic intensities on the probabilistic seismic performance of the structure, the positive effect of LRB can be observed in reducing the probability of collapse.


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