Journal of Structural and Construction Engineering

Journal of Structural and Construction Engineering

Evaluation of the Seismic Behavior of Special Truss Moment Frames (STMF) with X-Braced Configuration in Special Segment

Document Type : Original Article

Authors
Alireza Mirzaei 1
Abazar Asghari 2
Amirreza Ghiami Azad 3
1 Master's Student, School of Civil Engineering, College of Engineering, University of Tehran, Iran
2 Associate Professor, School of Civil Engineering, College of Engineering, University of Tehran, Iran
3 Assistant Professor, School of Civil Engineering, College of Engineering, University of Tehran, Iran
10.22065/jsce.2025.518496.3704
Abstract
In this study, the seismic performance of the Special Truss Moment Frame (STMF) with a X-braced special segment was numerically evaluated by considering the effects of the number of stories and panels in the special segment. The models were designed in ETABS and nonlinear static (pushover) and time history analyses were conducted in OpenSees based on FEMA P-695 and ASCE 7-22 guidelines. Nine models were developed with three height levels (2, 5, and 8 stories) and three configurations of the special segment (one-, two-, and three-panel). The results indicated that the overstrength factor (Ω) for most frames was close to the ASCE-recommended value of 3. The average Ω was calculated as 4.6, 4.6, and 4.2 for the 2-, 5-, and 8-story frames, respectively, confirming the satisfactory strength performance under seismic loading. Moreover, increasing the number of panels in the special segment improved the overstrength factor. Time history analysis showed that the average inter-story drift remained below 2%, and the residual drift was less than 0.1%, both within acceptable code limits. Despite differences in the number of special segment panels, the final drifts of all frames were found to be comparable, indicating similar lateral stiffness across the models. Furthermore, adding more panels in the special segment led to a reduction in steel consumption by approximately 9% to 11% in taller frames, promoting more economical designs. Overall, The X-braced STMF showed reliable seismic performance, making it a suitable choice for long-span and high-rise structures.
Keywords
Special truss moment frame
X-braced
Nonlinear Analysis
Pushover
Time history
Overstrength Factor
Ductility Factor
Drift

Subjects

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  • Receive Date 30 April 2025
  • Revise Date 07 July 2025
  • Accept Date 06 September 2025