Investigation of the Cyclic Behaviour of X-bracing Steel Frame with Quadrilateral Bending Fuse Installed at the Intersection of Braces

Document Type : Original Article

Authors

1 Master's student, Department of Civil Engineering, Azarbaijan Shahid Madani University, Tabriz, Iran

2 Assistant Professor, Department of Civil Engineering, Azarbaijan Shahid Madani University, Tabriz, Iran

10.22065/jsce.2023.396747.3113

Abstract

In this paper, to increase the ductility in steel concentrically braced frames, a new quadrilateral bending fuse is suggested at the intersection of the braces. In the first part, in order to achieve suitable dimensions, a diverse range of fuse dimensions and the behavior of the built models have been evaluated using ABAQUS software. The obtained results indicate that the maximum base shear and stiffness of the structure decreases with the increase in the dimensions of the opening used. The ratio of lateral stiffness value for 3% opening compared to X bracing is 44%, for 5% opening compared to X bracing it is 44% and for 10% opening compared to X bracing it is 20%. In the second part of the studies, firstly, a two-dimensional frame was designed using steel concentrically braced frames in ETABS software, and then three fifteen floors two-dimensional frame models by replacing quadrilateral bending fuses with 3, 5, and 10% opening percentages in OpenSees software was investigated. To evaluate the performance of studied frames, nonlinear dynamic time history analysis and nonlinear static analysis performed using different near field and far field accelerations was investigated. The meaning of 3% opening percentage is that the area of the quadrilateral fuse installed in the middle of the cross brace is equal to 3% of the product of the opening length of frame in the height of the floor. The results of dynamic analysis of time history show that for the near field earthquakes, the average base shear ratio for openings of 3%, 5% and 10% compared to X bracing is 72%, 40% and 26%, respectively. These values are equal to 72%, 38% and 24% for the far field, respectively.

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History

  • Receive Date: 17 May 2023
  • Revise Date: 25 August 2023
  • Accept Date: 23 September 2023

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