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Seismic performance assessment of steel frames with shape‐memory alloy wire‐based dampers
Author(s) -
Falahian Afsaneh,
Asadi Payam,
Riahi Hossein Tajmir,
Haghy Mahsa
Publication year - 2020
Publication title -
the structural design of tall and special buildings
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.895
H-Index - 43
eISSN - 1541-7808
pISSN - 1541-7794
DOI - 10.1002/tal.1797
Subject(s) - damper , structural engineering , fragility , residual , retrofitting , stiffness , sma* , reduction (mathematics) , shape memory alloy , seismic retrofit , engineering , computer science , reinforced concrete , mathematics , chemistry , geometry , algorithm , artificial intelligence
Summary Steel braces reduce the interstory drifts of steel structures under earthquake excitations; however, severe earthquakes could still cause some notable residual drifts in the structures. The reduction of these residual drifts decreases post‐earthquake retrofitting costs. This study investigates the seismic performance of steel frames equipped with a proposed self‐centering damper, using shape‐memory alloy (SMA) wires. For this purpose, incremental dynamic analyses are carried out on the steel frames of 3, 7, and 12 stories with self‐centering dampers of different capacities. The results of cyclic tests validate damper numerical modeling. The results indicate that the proposed damper limits the residual drifts. Also, fragility curves illustrate that the damper reduces the exceedance probabilities of limit states associated with residual story drift. The comparison among three design cases demonstrates that the most appropriate capacity for SMA dampers happens when it obtains the average capacity value required for equality between damper stiffness and strength and braces stiffness and strength, respectively. This particular design will eventually lead to the most efficient scenario in cases of performance and cost.