Evaluation of the fishbone model in simulating the seismic response of multistory reinforced concrete moment-resisting frames

  • Zhe QuEmail author
  • Ting Gong
  • Qiqi Li
  • Tao Wang


The fishbone model is a simplified numerical model for moment-resisting frames that is capable of modelling the effects of column-beam strength and stiffness ratios. The applicability of the fishbone model in simulating the seismic responses of reinforced concrete moment-resisting frames of different sets of column-beam strength and stiffness ratios are evaluated through nonlinear static, dynamic and incremental dynamic analysis on six prototype buildings of 4-, 8- and 12-stories. The results show that the fishbone model is practically accurate enough for reinforced concrete frames, although the assumption of equal joint rotation does not hold in all cases. In addition to the ground motion characteristics and the number of stories in the structures, the accuracy of the model also varies with the column-beam stiffness and strength ratios. The model performs better for strong column-weak beam frames, in which the lateral drift patterns are better controlled by the continuous stiffness provided by the strong columns. When the inelastic deformation is large, the accuracy of the model may be subjected to large record-to-record variability. This is especially the case for frames of weak columns.


fishbone model reinforced concrete frame strong column-weak beam column-beam stiffness ratio incremental dynamic analysis 


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This study is jointly sponsored by programs of the Scientific Research Fund of Institute of Engineering Mechanics, China Earthquake Administration (No. 2016A05, No. 2016A06) and the National Natural Science Foundation of China (No. 51478441). The financial support is greatly appreciated.


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© Institute of Engineering Mechanics, China Earthquake Administration 2019

Authors and Affiliations

  1. 1.Key Laboratory of Earthquake Engineering and Engineering Vibration, Institute of Engineering MechanicsChina Earthquake AdministrationHebeiChina
  2. 2.China Architecture Design & Research GroupBeijingChina
  3. 3.Institute of Engineering MechanicsChina Earthquake AdministrationHarbinChina

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