Experimental and Numerical Investigation of Local Buckling in Steel Reduced Beam Sections (RBSs)
Subject Areas : Analysis of Structure and Earthquake
Alireza Zaferani
1
(Department of Civil Engineering, Science and Research Branch, Islamic Azad University, Tehran, Iran.)
pasha pasha
2
(nnnnn)
پرهام معمارزاده
3
(دانشگاه آزاد اسلامی واحد نجف آباد)
Keywords: Reduced Section Beam, Local Buckling, Moment Resisting Frame, Plastic Hinge,
Abstract :
The use of steel moment frame systems is very popular among designers, but the main weakness in these systems is the plastic joint formation in the beam-to-column connection zone. Therefore, the idea of using beams with a reduced section (RBS) is a good suggestion to remove the plastic joint from the beam-to-column connection zone. By using steel beams with a reduced cross-section, a ductile fuse is created in the beam, which prevents the transfer of inelastic stresses and strains to the beam-to-column joint (in the welding zone. One of the main problems in steel beams with a reduced cross-section is buckling in the reduced zone of the beam. As a result of this local buckling in the wing and the life of the beam in the reduced zone, the resistance of these beams decreases compared to ordinary beams. In this article, the behavior of IPE300 beam with a reduced cross-section has been tested under cycling loading. Also, finite element analysis has been done for steel beams with different cross-sections to determine how much drift will cause local buckling in beams with different reduced cross-sections. Local buckling in the reduced zone of steel beams usually occurs in sections with small dimensions in 3% drift. But for sections with larger beam dimensions, these bucklings are created in lower drifts. These bucklings first start from the reduced wing zone of RBS beams and extend to the beam.
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