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FROM:
Ashwin Kumar and Dipti R. Sahoo (Dept. of Civil Engineering, Indian Institute of Technology Delhi, India),
“Effect of brace configurations on the behavior of SCBFS under near-field earthquake”. EUROSTEEL 2014, September 10-12, 2014, Naples, Italy
PARTIAL INTRODUCTION: Special concentrically braced frames (SCBFs) are used as lateral force-resisting systems in steel structures located in the high seismic areas to resist lateral loads through the vertical concentric truss system. Compared to other lateral force resisting systems, this system can be cheaper and is easier to build if proper care is taken in designing and detailing. The braces act as fuses which dissipate the input seismic energy through the tension yielding and compression buckling. Thus, the axial deformation of the braces allows the system as a whole to have ample drift capacity to resist the lateral forces without any failure of gravity load-resisting members. Several parameters, such as, brace slenderness ratio, width-to-thickness ratio, size and detailing of gusset plate, brace configurations, etc. control the response of SCBFs under earthquake loading.
Sometimes the frame members can buckle; sometimes one or more of the buckling restraining braces (BRBs) can buckle.
Examples are shown in the next 6 images in which a BRB buckles.
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