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Steel and Composite Structures
  Volume 35, Number 4, May25 2020, pages 599-609
DOI: http://dx.doi.org/10.12989/scs.2020.35.4.599
 


Evaluation of seismic performance factors for tension-only braced frames
Mahdi Shariati, Majid Lagzian, Shervin Maleki, Ali Shariati and Nguyen Thoi Trung

 
Abstract
    The tension-only braced frames (TOBFs) are widely used as a lateral force resisting system (LFRS) in low-rise steel buildings due to their simplicity and economic advantage. However, the system has poor seismic energy dissipation capacity and pinched hysteresis behavior caused by early buckling of slender bracing members. The main concern in utilizing the TOBF system is the determination of appropriate performance factors for seismic design. A formalized approach to quantify the seismic performance factor (SPF) based on determining an acceptable margin of safety against collapse is introduced by FEMA P695. The methodology is applied in this paper to assess the SPFs of the TOBF systems. For this purpose, a trial value of the R factor was first employed to design and model a set of TOBF archetype structures. Afterwards, the level of safety against collapse provided by the assumed R factor was investigated by using the non-linear analysis procedure of FEMA P695 comprising incremental dynamic analysis (IDA) under a set of prescribed ground motions. It was found that the R factor of 3.0 is appropriate for safe design of TOBFs. Also, the system overstrength factor was estimated as 2.0 by performing non-linear static analyses.
 
Key Words
    tension-only bracing; response modification factor; incremental dynamic analysis; seismic design; overstrength factor
 
Address
Mahdi Shariati: Institute of Research and Development, Duy Tan University, Da Nang 550000, Vietnam
Majid Lagzian and Shervin Maleki: Department of Civil Engineering, Sharif University of Technology, Tehran, Iran
Ali Shariati and Nguyen Thoi Trung: Division of Computational Mathematics and Engineering, Institute for Computational Science, Ton Duc Thang University,
Ho Chi Minh City 758307, Vietnam;
Faculty of Civil Engineering, Ton Duc Thang University, Ho Chi Minh City 758307, Vietnam
 

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