Seismic retrofit of special truss moment frames using viscous dampers

The special truss moment frame (STMF) is known to provide higher lateral stiffness with relatively less weight as compared to conventional moment resisting frames. In this study the seismic performance of STMF was investigated by fragility analyses and the results were compared with the performance...

Full description

Saved in:
Bibliographic Details
Published in:Journal of constructional steel research 2016-08, Vol.123, p.53-67
Main Authors: Kim, Jinkoo, Lee, Joonho, Kang, Hyungoo
Format: Article
Language:English
Subjects:
Earthquake dampers
Fragility
Fragility analysis
Frames
Retrofitting
Segments
Seismic engineering
Seismic performance
Seismic response
Special truss moment frames
Trusses
Viscous dampers
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:The special truss moment frame (STMF) is known to provide higher lateral stiffness with relatively less weight as compared to conventional moment resisting frames. In this study the seismic performance of STMF was investigated by fragility analyses and the results were compared with the performance of special moment resisting frames. Then seismic retrofit scheme was proposed by installing a viscous damper in the special segment to meet enhanced seismic performance objective. The required amount of additional viscous damping was determined based on the nonlinear static procedure provided in the ASCE/SEI 41-10. The analysis results showed that the STMF showed larger stiffness and strength but smaller ductility compared with the moment frames, which resulted in similar seismic fragility in both structures. The seismic performance of STMF with viscous dampers in the special segments turned out to meet the desired target performance, and the effect of adding viscous dampers in the seismic fragility was most significant in the complete damage state. •Seismic performance of STMF was investigated by fragility analyses.•Then seismic retrofit scheme was proposed by installing a viscous damper in the special segment.•The analysis results showed that the STMF showed larger stiffness and strength but smaller ductility.•The seismic performance of STMF with viscous dampers turned out to meet the desired target performance.
ISSN:0143-974X
1873-5983
DOI:10.1016/j.jcsr.2016.04.027