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Mergos, P.E.; Kappos, A. J. (2008)
Publisher: John Wiley & Sons
Languages: English
Types: Article
Subjects: TH, TA
Α beam-column type finite element for seismic assessment of R/C frame structures is presented. This finite element consists of two interacting, distributed flexibility subelements representing inelastic flexural and shear response. Following this formulation, the proposed model is able to capture spread of flexural yielding, as well as spread of shear cracking, in R/C members. The model accounts for shear strength degradation with inelastic curvature demand, as well as coupling between inelastic flexural and shear deformations after flexural yielding, observed in many experimental studies. An empirical relationship is proposed for evaluating average shear distortion of R/C columns at onset of stirrup yielding. The proposed numerical model is validated against experimental results involving R/C columns subjected to cyclic loading. It is shown that the model can predict well the hysteretic response of R/C columns with different failure modes, i.e. flexure-critical elements, elements failing in shear after flexural yielding, and shear-critical R/C members.
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    • Figure 10: Lehman et al. (1998) specimen 415: (a) Lateral load vs. total displacement; (b) Shear demand and shear capacity vs. curvature demand of the end section; (c) Shear force vs. shear strain hysteresis loops; (d) Time history of displacement components
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