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Computation of R Factor for Steel Moment Frames by Using Conventional and Adaptive Pushover Methods

  • Research Article - Civil Engineering
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Abstract

Response modification factor, R, can be extracted using static pushover method to reduce the time and complication of dynamic analyses. Recently developed modal and adaptive pushover methods account, respectively, for higher mode effects and changes in structure due to gradual damage during analysis. However, previous attempts on extraction of R factor using pushover method have not incorporated these advances and the present study aims to determine the R factor of steel moment frames using advanced methods. Also, previous researches have determined the target push displacement by monitoring the global behavior of structure and ignoring the collapse modes that may occur due to excessive inter-story drifts. As another innovation, the effect of local collapse modes on R factor of studied frames is accounted for by joint consideration of global and inter-story drifts. Five steel moment frames of 4, 7, 10, 15, and 20 stories are subjected to advanced pushover methods using OpenSees software. It is shown that for high-rise structures subjected to adaptive pushover methods, selection of the response spectrum has a large effect on the resulting R factor. Linear equations are also derived to predict R and other seismic parameters as a function of height and period of structures.

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Authors and Affiliations

  1. Earthquake Engineering Group, Faculty of Civil Engineering, Semnan University, Semnan, Iran

    M. Gerami & A. H. Mashayekhi

  2. Department of Civil Engineering, Academic Center for Education, Culture and Research, Khuzestan Branch, Ahwaz, Iran

    N. Siahpolo

Authors
  1. M. Gerami
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  2. A. H. Mashayekhi
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  3. N. Siahpolo
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Correspondence to N. Siahpolo.

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Gerami, M., Mashayekhi, A.H. & Siahpolo, N. Computation of R Factor for Steel Moment Frames by Using Conventional and Adaptive Pushover Methods. Arab J Sci Eng 42, 1025–1037 (2017). https://doi.org/10.1007/s13369-016-2257-5

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  • DOI: https://doi.org/10.1007/s13369-016-2257-5

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