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Analysis of Seismic Response of 3-D Steel Frame

Archana D.P.


It is of critical importance that the structures that need seismic retrofitting are correctly identified, and an optimal retrofitting is conducted in a cost-effective fashion. Among the retrofitting techniques available, steel braces can be considered as one of the most efficient solution for seismic performance upgrading of RC frame structures. This paper investigates the seismic behavior of 3D-steel frame with different type of bracings for seismic loading condition corresponding to zone 4 and zone 5. The 3-D steel frame without and with different types of steel braces—X-braced, K-braced, knee braced, and diagonal bracings are designed according to IS codal provisions and modeled by using software package, SAP 2000 V14. To strengthen the joints gusset plates and shear plates were provided. It is found that adding braces enhances the global capacity of the buildings in terms of strength, deformation and ductility as compared to the case with no bracing, and the X bracing systems performed better depending on the type and size of the cross-section.

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