Improving the Performance of Steel Moment Frame Using Locally Post-tensioned Connections

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Heydari Tafreshi A.M.; GERAMI M.

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Journal Paper

Paper Information

Journal: MODARES CIVIL ENGINEERING JOURNAL Year:2021 | Volume:21 | Issue:4 Page(s): 169-184

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Information Journal Paper

Title

Improving the Performance of Steel Moment Frame Using Locally Post-tensioned Connections

Author(s)

Heydari Tafreshi A.M. | GERAMI M. | Issue Writer Certificate

Keywords

Posttensioned energy dissipating (PTED) connection

Performance Efficiency Factor (PEF)

Time history analysis

Abstract

Extensive numerical and experimental studies of self-centered steel systems have been conducted by researchers in recent years. Despite this extensive research, their use is still not common enough due to differences in the performance of such structures. The need for skilled manpower and equipment to create post tensioning and installation of energy dissipating elements are among the factors that increase the cost of selfcentered structures compared to the implementation of structures with conventional welding connections. Due to the relatively high cost of retrofitting using post tensioned connections, the optimal use of such systems can be considered as a way to increase their use in seismic improvement. For this purpose, the seismic improvement of the steel moment frame by creating a self-centered system has been evaluated locally and only in some floors in this paper. In the evaluations performed in this research, the PF and PEF coefficients have been introduced and used. After performing two hundred and eighty five time history analyzes on nineteen three and six-story frames using Perform-3d software, it was observed that if the appropriate pattern of location of post tensioned connections is selected in the floors, a higher performance can be obtained compared to the frame performance with the post tensioned connections in all floors. However, the use of post tension connections in all floors has resulted in a performance improvement of only 0. 1% more than the t-4 frame. Among the eight three story frames evaluated in this study, the t-4 frame has been selected as the most appropriate improvement plan. The mentioned frame has resulted in a performance improvement of 23. 2% compared to the frame with welded connections in all floors. The t-4 frame has post tensioned connections in only two-thirds of the floors, indicating that for other frames in various seismic improvement projects, the evaluation of different modes can have appropriate economic consequences. Among the three story frames, the t-1 frame has improved the performance of the structure by 15. 3% by using post tension connection in only one floor. If this performance enhancement is sufficient for the frame, the t-1 frame can be a good choice. Also, in a retrofitting project, if the financial resources are not injected together, the initial upgrade of the frame can be done in the first step by converting the frame with welded connections to the t-1 frame. Then, after financing, it converted the t-1 frame to a 3st-PTED or t-4 frame and provided the highest performance. Among the eleven six story frames, the s-9 frame provides the highest performance and highest efficiency. The mentioned frame, using post tensioned connections in the first four floors, has caused a performance improvement of 30. 1% compared to the frame with common welded connections in all floors, which is even higher than the performance improvement of the 6st-PTED frame. In other words, the 6st-PTED frame, using post tensioned connections on all floors, results in a performance improvement of 23. 9%, which is less than the value for the s-9 frame.

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APA: Copy

Heydari Tafreshi, A.M., & GERAMI, M.. (2021). Improving the Performance of Steel Moment Frame Using Locally Post-tensioned Connections. MODARES CIVIL ENGINEERING JOURNAL, 21(4 ), 169-184. SID. https://sid.ir/paper/1036584/en

Vancouver: Copy

Heydari Tafreshi A.M., GERAMI M.. Improving the Performance of Steel Moment Frame Using Locally Post-tensioned Connections. MODARES CIVIL ENGINEERING JOURNAL[Internet]. 2021;21(4 ):169-184. Available from: https://sid.ir/paper/1036584/en

IEEE: Copy

A.M. Heydari Tafreshi, and M. GERAMI, “Improving the Performance of Steel Moment Frame Using Locally Post-tensioned Connections,” MODARES CIVIL ENGINEERING JOURNAL, vol. 21, no. 4 , pp. 169–184, 2021, [Online]. Available: https://sid.ir/paper/1036584/en

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