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Earthquakes and Structures
  Volume 15, Number 2, August 2018 , pages 123-132

Criterion for judging seismic failure of suspen-domes based on strain energy density
Ming Zhang, Gerry Parke, Shixuan Tian, Yanxia Huang and Guangchun Zhou

    In this paper the strain energy density (SED) model is used to analyze the seismic behavior of suspen-domes and a new criterion is established for judging the seismic failure based on a characteristic point in the SED model. Firstly, a nonlinear time-history response analysis was carried out using the finite-element package ANSYS for typical suspen-domes subjected to different ground motions. The seismic responses including nodal displacements, ratios of yielding members, strain energy density and structural maximum deformation energy were extracted corresponding to the increasing peak ground acceleration (A). Secondly, the SED sum (Id) was calculated which revealed that the Id -A curve exhibited a relatively large change (called a characteristic point) at a certain value of A with a very small load increment after the structures entered the elastic-plastic state. Thirdly, a SED criterion is proposed to judge the seismic failure load based on the characteristic point. Subsequently, the case study verifies the characteristic point and the proposed SED criterion. Finally, this paper describes the unity and application of the SED criterion. The SED method may open a new way for structural appraisal and the SED criterion might give a unified criterion for predicting the failure loads of various structures subjected to dynamic loads.
Key Words
    suspen-dome; SED criterion; characteristic point; failure load; nonlinear time-history response analysis
Ming Zhang: School of Civil Engineering, Southwest Jiaotong University, Chengdu 610031, China
Gerry Parke: Department of Civil and Environmental Engineering, University of Surrey, Guildford GU2 7XH, UK
Shixuan Tian: Beijing Branch, Arup International Consultant (Shanghai) Co. Ltd, Beijing, China
Yanxia Huang: School of Civil Engineering, Southwest Jiaotong University, Chengdu 610031, China
Guangchun Zhou: School of Civil Engineering, Harbin Institute of Technology, 73 Huang he Road, Harbin, China

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