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Earthquakes and Structures
  Volume 13, Number 3, September 2017, pages 309-322

A simplified evaluation method of skeleton curve for RC frame with URM infill
Kiwoong Jin and Ho Choi

    In this paper, a simplified evaluation method of the skeleton curve for reinforced concrete (RC) frame with unreinforced masonry (URM) infill is proposed in a practical form, based on the previous studies. The backbone curve for RC boundary frame was modeled by a tri-linear envelope with cracking and yielding points. On the other hand, that of URM infill was modeled by representative characteristic points of cracking, maximum, and residual strength; also, the interaction effect between RC boundary frame and the infill was taken into account. The overall force-displacement envelopes by the sum of RC boundary frame and URM infill, where the backbone curves of the infill from other studies were also considered, were then compared with the previous experimental results. The simplified estimation results from this study were found to almost approximate the overall experimental results with conservative evaluations, and they showed much better agreement than the cases employing the infill envelopes from other studies.
Key Words
    RC frame; URM infill; diagonal strut mechanism; backbone curve; ASCE41-06
Kiwoong Jin: Department of Architectural and Building Science, Tohoku University, Sendai, Japan
Ho Choi: Institution of Industrial Science, The University of Tokyo, Tokyo, Japan

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