International Research Journal of Engineering and Technology (IRJET) e-ISSN: 2395-0056 Volume: 10 Issue: 07 | Jul 2023
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p-ISSN: 2395-0072
PROGRESSIVE COLLAPSE PERFORMANCE OF STEEL CONNECTION WITH EFFICIENT SEISMIC DESIGNS SREEDEVI K1, ADILA ABDULLA KUNJU2 1Sreedevi K, Dept of civil Engineering, ICET Mulavoor, Kerala
2Adila Abdulla Kunju, Dept of civil Engineering, ICET Mulavoor, Kerala ---------------------------------------------------------------------***--------------------------------------------------------------------characteristics and produce structural displacement. In Abstract - Corrugated plates are utilized in place of the flat
web of the beam at the region near to the column face, known as the curved corrugated web RBS, in order to reduce the beam's flexural strength and assure hinge formation in this area. The corrugated web's application lowers the beam's flange width-to-thickness ratio while boosting lateral and torsional stability in the lowered section zone. To describe the design process and determine the resistance to progressive collapse, FEM is employed. Several models are built using the provided details of the beam and column sections after the numerical model's validation. Then, taking into account the three possible depths for the corrugated cells, these models are examined under cyclic loading. Connections without RBS and with RBS such as flange cut (FC-RBS), are used for comparison. The findings demonstrate that the proposed connection induces the formation of plastic hinges in RBS zone, preventing failure at the beam column junction. This recommended connection performs better than the conventional FC-RBS connection in terms of yield strength, rotation capacity, ductility, and load bearing capacity.
particular, the web-reduction created a discontinuous force transmission path, which subjected the beam web to an additional concentrated force. Because of this, it is necessary to evaluate the load carrying capacity, deflection, and cracking of beams with flange and web reductions, which can be evaluated indirectly by their ability to sustain progressive collapse.
Key Words: RBS connection, Corrugated web, Cyclic
1.1 Corrugated Web RBS
Prior research concentrated mainly on how connections performed with or without RBS. In this study, a new type of RBS connection is created to allow for connections with better ductility, load carrying capacity and energy absorption. It has been feasible to compare the common weld connections (W-RBS), traditional RBS connections (FCRBS), and the new RBS connection (CW-RBS) using numerical validation. The deformation, failure modes, load carrying capacity, rotation capacity, moment capacity, ductility, yield point, stress concentration, and strain distribution are explained and analyzed in detail.
loading, Seismic behavior
It is possible to construct steel moment frames with more acceptable seismic responses by using corrugated web RBS connections, which have advantages over traditional RBS connections. The corrugated web's geometry in the RBS zone can also be changed in order to further enhance these connections' seismic performance. In this study, a novel corrugated web RBS connection, the curved cell web RBS (CW-RBS) is presented. In the proposed connection, a fullcapacity rigid connection is made by welding the beam using Complete Joint Penetration (CJP) to the column's flange. In a region close to the column, the beam's web is cut, and the removed portion is replaced by a cell formed of two corrugated plates. The cell is constructed using two curved plates, known as the curved cell web RBS (CW-RBS) connection. The paper goes into considerable detail in the next part to describe both the design approach and the suggested connection. The development of a finite element model and its validation using the available empirical data are then covered in the following parts. The model was created for assessing the resistance to progressive collapse. The examination of the beam's inelastic behavior in the RBS zone and the energy dissipation capacity of the suggested connection in comparison to conventional RBS is shown at the end of the paper.
1. INTRODUCTION Steel moment frame connections can be secured against brittle failure by using Reduced Beam Section (RBS) connections, which include weakening the beam near to the column face. This technique makes sure that the beam has less flexural strength in the RBS zone than in any other adjacent regions, causing plastic hinges to develop here. By preventing nonlinear behavior from spreading to the connection, this aids in reducing brittle failure in this location. Researchers have proposed a number of methods for reducing the beam's moment capacity at the area where the plastic hinge is gradually developed. The most common RBS connection, referred known as ‘dog bone connection’, is made by cutting off the beam's flange just beyond the column face in order to ensure flexural yielding there. This cut can be made using a straight cut, a tapered cut, or a radius cut. Due to its enhanced seismic performance, the Radius Cut RBS (RC-RBS) connection has been included to the AISC 358-16. When considerable deformation occurs, connections with flange or web reduction may affect the mechanical
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