Sensitivity Analysis of Tubular-Web Reduced Beam Section Connections Under Cyclic Loading
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International Journal of Steel Structures https://doi.org/10.1007/s13296-020-00418-1
Sensitivity Analysis of Tubular‑Web Reduced Beam Section Connections Under Cyclic Loading Masood Vahedi1 · Reza Ardestani2 · Seyed Mehdi Zahrai2 Received: 28 February 2018 / Accepted: 21 September 2020 © Korean Society of Steel Construction 2020
Abstract Recently a new type of Reduced Beam Section (RBS) connection called “Tubular Web RBS (TW-RBS)” has been numerically and experimentally studied. TW-RBS connections are made by replacing a part of web with a tube or pipe at the desirable location of the beam plastic hinge. This paper aims to numerically investigate the effect of key factors such as position, diameter, and thickness of the tube on the hysteretic behavior of the connection under cyclic load using ABAQUS finite element software. First, a model is used for verification purposes where good correlation with experimental results was achieved. Then, 14 models are defined by varying the key parameters and subjected to cyclic loading. The effects of such factors on the behavior of the connection are investigated in order to find out consequences of probable defects during the implementation of TW-RBS connections or intentional utilizing of other pipes in TW-RBSs. Based on the results, the position of the tube is the most sensitive factor in the behavior of TW-RBS connections and its improper location leads to unreliable design, probable plastic hinge formations in unpredicted regions, and possible failure in the connection zone. On the contrary, diameter and thickness of the tube have negligible effect on the energy dissipation mainly depending on beam section properties. Keywords Reduced beam section · Tubular web RBS (TW-RBS) · Sensitivity analysis · Cyclic behavior · Moment resisting steel frames
1 Introduction Ductile behavior, energy absorption capability and dissipation of energy exerted by earthquakes, make MRFs (moment-resisting frames) distinct from other lateral load bearing systems. The design process of MRFs are based on the assumption that the frame has the necessary ductility, resistance, and energy dissipation against severe earthquakes. The Northridge (1994) and Kobe (1995) earthquakes accentuated unexpected brittle failures in beam to column * Seyed Mehdi Zahrai [email protected] Masood Vahedi [email protected] Reza Ardestani [email protected] 1
Department of Civil and Environmental Engineering, University of Nevada, Reno, USA
School of Civil Engineering, College of Engineering, University of Tehran, P.O. Box 11155‑4563, Tehran, Iran
2
connections in steel MRFs and resulted in concerns about the details and methods of connection design. Accordingly, providing ductility and resistance against large cyclic plastic deformations were given special attention. Investigations of the damages caused by these two earthquakes resulted in delineation and recapitulation of the causes of these damages. The generation of severe stresses concentrated in the vicinity of bolted and welded zones of connecti
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