Incremental Dynamic Analysis of Shape Memory Alloy Braced Steel Frames

2014 ◽  
Vol 680 ◽  
pp. 263-266
Author(s):  
Saber Moradi ◽  
M. Shahria Alam
Keyword(s):  
Shape Memory Alloy ◽  
Dynamic Analysis ◽  
Shape Memory ◽  
Seismic Performance ◽  
Steel Frames ◽  
Incremental Dynamic Analysis ◽  
Braced Frames ◽  
Earthquake Excitation ◽  
Uniform Drift ◽  
Buckling Restrained Braced Frames

Incremental Dynamic Analysis (IDA) is a technique to determine the overall seismic performance of structures under varied intensities of earthquakes. In this paper, the seismic performance of four-story steel braced frames equipped with superelastic Shape Memory Alloy (SMA) braces is assessed by performing IDA. The seismic response of SMA-braced frames was compared to that of corresponding Buckling-Restrained Braced Frames (BRBFs). Based on the results of this comparative study, the SMA-braced frames were generally effective in reducing maximum interstory drifts and permanent roof deformations. In addition, the SMA-braced frames demonstrated more uniform drift distribution over the height of the building. As the intensity of earthquake excitation increases, a higher response reduction can be expected for SMA-braced frames.

scholarly journals Seismic performance of MR steel frames via Incremental Dynamic Analysis

ce/papers ◽  
2021 ◽  
Vol 4 (2-4) ◽  
pp. 1924-1931
Author(s):  
Claudio Bernuzzi ◽  
Davide Rodigari ◽  
Marco Simoncelli
Keyword(s):  
Dynamic Analysis ◽  
Seismic Performance ◽  
Steel Frames ◽  
Incremental Dynamic Analysis

Inelastic behavior of smart recentering buckling-restrained braced frames with superelastic shape memory alloy bracing systems

2012 ◽  
Vol 227 (4) ◽  
pp. 806-818 ◽  
Author(s):  
Jong Wan Hu ◽  
Dong Ho Choi ◽  
Dong Keon Kim
Keyword(s):  
Shape Memory Alloy ◽  
Shape Memory ◽  
Large Strains ◽  
Self Healing ◽  
Inelastic Behavior ◽  
Braced Frames ◽  
Concentrically Braced Frames ◽  
Buckling Restrained Brace ◽  
Buckling Restrained Braced Frames ◽  
Brace Frames

Buckling-restrained braced frames are steadily replacing concentrically braced frames because buckling-restrained brace can yield without buckling when subjected to both tension and compression. Though buckling-restrained brace frames are being widely used as framing structures for construction in high seismicity areas, it is shown that at large strains, a considerable amount of permanent deformation is produced at the support connector between the brace and the frame. This drawback can be overcome by providing recentering capabilities to the braced frame system. By applying the concept of a recentering system to the design of buckling-restrained brace frames, we developed braced frames that incorporate buckling-restrained braces with superelastic shape memory alloy end-support connectors. Owing to the recentering capability, shape memory alloy materials have been used in the place where large deformation may feasibly occur. The primary advantages of the innovative braced frames proposed herein are verified through nonlinear pushover analyses. Analytical frame models are developed to estimate theultimate and residual inter-story drifts. The analysis results suggest that buckling-restrained brace frames with superelastic shape memory alloy bracing systems are more effective in controlling residual inter-story drifts than those with conventional steel bracing systems owing to the inherent self-healing characteristics of superelastic shape memory alloys.

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