Seismic collapse assessment of K-shaped bracings in cold-formed steel frames

Structures ◽  
2020 ◽  
Vol 25 ◽  
pp. 256-267
Author(s):  
Hossein Tajmir Riahi ◽  
Mehran Zeynalian ◽  
Amin Rabiei ◽  
Ehsan Ferdosi
Keyword(s):  
Steel Frames ◽  
Seismic Collapse ◽  
Cold Formed Steel ◽  
Collapse Assessment

Comparison of steel frames with RWS and WFP beam-to-column connections through seismic fragility analysis

2020 ◽  
pp. 136943322097728
Author(s):  
Haoran Yu ◽  
Weibin Li
Keyword(s):  
Limit State ◽  
Pushover Analysis ◽  
Steel Frames ◽  
Fragility Analysis ◽  
Structural Safety ◽  
Seismic Fragility ◽  
Fe Modelling ◽  
Collapse Resistance ◽  
Seismic Collapse ◽  
Probabilistic Seismic Demand

Reduced web section (RWS) connections and welded flange plate (WFP) connections can both effectively improve the seismic performance of a structure by moving plastic hinges to a predetermined location away from the column face. In this paper, two kinds of steel frames—with RWS connections and WFP connections—as well as different frames with welded unreinforced flange connections were studied through seismic fragility analysis. The numerical simulation was conducted by using multiscale FE modelling. Based on the incremental dynamic analysis and pushover analysis methods, probabilistic seismic demand analysis and seismic capability analysis were carried out, respectively. Finally, combined with the above analysis results, probabilistic seismic fragility analysis was conducted on the frame models. The results showed that the RWS connection and WFP connection (without double plates) have little influence on reducing the maximum inter-storey drift ratio under earthquake action. RWS connections slightly reduce the seismic capability in non-collapse stages and improve the seismic collapse resistance of a structure, which exhibits good structural ductility. WFP connections can comprehensively improve the seismic capability of a structure, but the seismic collapse resistance is worse than that of RWS connections when the structure has a large number of storeys. The frame with WFP connections has a lower failure probability at every seismic limit state, while the frame with RWS connections sacrifices some of its structural safety in non-collapse stages to reduce the collapse probability.

An Investigation of Vector Intensity Measures for Seismic Collapse Assessment Under Far-Field Aftershocks

2020 ◽  
pp. 2150004
Author(s):  
F. Soleiman Meigooni ◽  
M. Tehranizadeh
Keyword(s):  
Seismic Response ◽  
Time History ◽  
Considerable Effect ◽  
Far Field ◽  
Spectral Acceleration ◽  
Intensity Measures ◽  
Rc Frames ◽  
Seismic Collapse ◽  
Collapse Assessment

Aftershock records have a considerable effect on the results of collapse assessments conducted on buildings. Thus, they should be selected cautiously. As the number of recorded aftershocks is not sufficient, mainshock records are often utilized instead. In order to increase the correlation between the aftershock time history and the seismic response of a structure, this research intends to investigate several Intensity Measures (IMs). For this study, three RC frames were considered. Forty-four far-field records from FEMAP-695 were selected as main and aftershock. Each building analysis was conducted under 44 mainshock–aftershock chains. According to the results, use of the summation of the first mode spectral acceleration value of aftershocks as the second part of a vector IM can lead to the sufficiency of the IM.

Seismic Behavior of Cold-Formed Steel Frames with Bolted Moment Connections

2020 ◽  
Vol 146 (3) ◽  
pp. 04019212
Author(s):  
Ming Chen ◽  
Jia-Hao Huo ◽  
Yi-Wen Xing
Keyword(s):  
Seismic Behavior ◽  
Steel Frames ◽  
Moment Connections ◽  
Cold Formed Steel

Seismic collapse probability of eccentrically braced steel frames

2017 ◽  
Vol 24 (1) ◽  
pp. 37-52
Author(s):  
Yongsheng Qi ◽  
Weiqing Li ◽  
Ningning Feng
Keyword(s):  
Steel Frames ◽  
Collapse Probability ◽  
Seismic Collapse

Seismic collapse assessment of a hybrid cold-formed hot-rolled steel building

2019 ◽  
Vol 155 ◽  
pp. 504-516 ◽  
Author(s):  
Kamyar Kildashti ◽  
Bijan Samali ◽  
Mina Mortazavi ◽  
Hamid Ronagh ◽  
Pezhman Sharafi
Keyword(s):  
Rolled Steel ◽  
Steel Building ◽  
Seismic Collapse ◽  
Hot Rolled ◽  
Hot Rolled Steel ◽  
Collapse Assessment
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