Improving the collapse behavior of double layer scallop space domes using tube in tube force limiting device

Document Type : Original Article

Authors

1 1- Department of Civil Engineering, Urmia Branch, Islamic Azad University, Urmia, Iran

2 1- Department of Civil Engineering, Urmia Branch, Islamic Azad University, Urmia, Iran 2- Department of Civil Engineering, Faculty of Engineering, Urmia University, Urmia, Iran

Abstract

Double-layer scallop space domes is one of the new types of domes whose geometric shape is a function of parameters such as height to span ratio, amplitude to span ratio, arc style of sectors and style of variation in meridional direction. In these structures, the buckling behavior of the compression member has a determinative role in the collapse behavior of the structure and it is necessary to use an appropriate solution to deal with the failure of the compression member and consequently the collapse of scallop domes. One of the solutions is to replace the compression members with FLD, which can prevent collapse. In the present study, a TTFLD has been used, which has efficiency in eliminating the buckling of the compression member. First, the effect of geometric parameters on the collapse behavior of domes was investigated using the FEM and nonlinear analysis, and critical members prone to collapse in scallop domes with different geometric shapes were identified. The critical compression members were then replaced with TTFLDs, and the reinforced scallop domes were re-analyzed. By comparing the collapse behavior of domes in two cases with and without the use of FLDs, the results showed that by replacing the critical compression members with FLDs, a significant improvement in the collapse behavior of the models is achieved. The improvement is directly related to the number of devices. With increasing the ratio of amplitude to span, the ductility and bearing capacity of the domes increase. In addition, by changing the style variation from linear to parabolic in the direction of the meridian lines, the ductility and bearing capacity of the dome increase. In the change of arc style from sinusoidal to parabolic, with increasing the ratio of height to span, the bearing capacity and ductility of the scallop dome increase.

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References

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Journal of Structural and Construction Engineering
Volume 8, Issue 11 - Serial Number 51
February 2022
Pages 211-238

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History

  • Receive Date: 21 October 2020
  • Revise Date: 21 November 2020
  • Accept Date: 28 May 2021

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