
Moment-resistant steel frames (MRFs) are widely used globally due to numerous advantages in modern civilengineering construction practices. Their rapid design, faster fabrication and assembly capabilities, availabilityof practical and artistic shapes of steel sections, high strength, ductility, reliability, and sustainability againstadverse conditions contribute to their worldwide acceptance.For seismic-resistant design in India, the strong column-weak beam (SCWB) concept is employed to designmoment frames. This approach promotes the formation of plastic hinges primarily in beams, away from thecolumn face, minimizing the risk of brittle failure at beam-column connections. Typically, outer moment framesare designed to handle lateral loads from the entire structure, while interior frames are designed for gravity loadswith simple shear connections. The major drawback of this methodology is that local damages tend to occur inthe perimeter frames, resulting in eccentricities. If these eccentricities and the resulting additional torsionalmoments are not properly accounted for, they can lead to extensive damage or even complete structural collapse.Steel structures are crucial in the construction industry, especially for seismic performance. The Indian code (IS800-2007) mandates the design of multi-story steel-framed buildings with various bracings, such as X-braced,diagonally braced, alternately diagonally braced, V-braced, inverted V-braced, and K-braced. A study analyzedthe performance of diagonal, X, V, and inverted-V eccentric bracings using the SAP-2000 software package. Thestudy found that braced steel frames significantly reduce lateral displacements, have a shorter modal period, andhave higher frequencies. The ductility of a moment-resisting steel frame is affected by its height, and this heightdependency of ductility is magnified when bracing systems are included.The findings indicate that lateral displacements experience a notable decrease in braced steel frames. Furthermore,the modal period for various modes of braced steel frames is relatively shorter compared to unbraced frames, withthe frequencies of braced steel frames being higher. The ductility of a moment-resisting steel frame is influencedby its height, and this dependency is accentuated when bracing systems are incorporated.
Moment resistant steel frame
Moment resistant steel frame
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