To investigate the interstory drift control effect under different hybrid control schemes using b... more To investigate the interstory drift control effect under different hybrid control schemes using buckling restrained braces (BRB) and viscous dampers (VD), and to study the effect of square root of sum of squares (SRSS) combined intensity measures (IMs) with engineering demand parameters (EDPs) on fragility assessment, incremental dynamic analysis (IDA) based seismic fragility assessment is performed on three numerical models of a super tall building (729 m) in its both structural principal directions. One is the uncontrolled model, the other two are damped models where the BRBs serve as the diagonal member of outrigger truss (BRB outriggers) at the upper part of structure while the improved viscously damper outriggers (IVDOs) are set at the lower location of the building, or conversely. The results suggest that structure can have smaller maximum interstory drift as well as exceeding probabilities if the IVDOs locate at the lower part of structure meanwhile the BRB outriggers are installed at the upper part of structure. Moreover, IDA demonstrates that the SRSS combined IMs and engineering demand parameters (EDPs) may have higher efficiency compared with results from non-combined ones, and the combined EDP limit obtained by the limit in one direction multiply the square root of sum of 1 and λ 2 , where λ is the ratio of PGA of seismic records input in the two structural principal directions, is also suitable for fragility analysis. Additionally, studies on the fragility analysis using peak ground velocity (PGV) demonstrate that, for tall buildings, PGV is not only suitable for IDA but also works well in fragility analysis based on its high efficiency and reasonable exceeding probabilities.
To investigate the interstory drift control effect under different hybrid control schemes using b... more To investigate the interstory drift control effect under different hybrid control schemes using buckling restrained braces (BRB) and viscous dampers (VD), and to study the effect of square root of sum of squares (SRSS) combined intensity measures (IMs) with engineering demand parameters (EDPs) on fragility assessment, incremental dynamic analysis (IDA) based seismic fragility assessment is performed on three numerical models of a super tall building (729 m) in its both structural principal directions. One is the uncontrolled model, the other two are damped models where the BRBs serve as the diagonal member of outrigger truss (BRB outriggers) at the upper part of structure while the improved viscously damper outriggers (IVDOs) are set at the lower location of the building, or conversely. The results suggest that structure can have smaller maximum interstory drift as well as exceeding probabilities if the IVDOs locate at the lower part of structure meanwhile the BRB outriggers are installed at the upper part of structure. Moreover, IDA demonstrates that the SRSS combined IMs and engineering demand parameters (EDPs) may have higher efficiency compared with results from non-combined ones, and the combined EDP limit obtained by the limit in one direction multiply the square root of sum of 1 and λ 2 , where λ is the ratio of PGA of seismic records input in the two structural principal directions, is also suitable for fragility analysis. Additionally, studies on the fragility analysis using peak ground velocity (PGV) demonstrate that, for tall buildings, PGV is not only suitable for IDA but also works well in fragility analysis based on its high efficiency and reasonable exceeding probabilities.
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