- A combined local damage index for seismic assessment of existing RC structures
- P.E. Mergos ; A.J. Kappos
- Book Title / Journal: Earthquake Engineering and Structural Dynamics,
- Year: 2013 , Volume: 42 , Series:
- Earthquake engineering
- Description
- A new local damage index for existing reinforced concrete (RC) structures is
introduced, wherein deterioration caused by all deformation mechanisms (flexure,
shear, anchorage slip) is treated separately for each mechanism. Moreover, the
additive character of damage arising from the three response mechanisms, as well as
the increase in degradation rate caused by their interaction, are fully taken into
consideration. The proposed local damage index is then applied, in conjunction with a
finite element model developed previously by the authors, to assess seismic damage
response of several RC column and frame test specimens with substandard detailing.
It is concluded that in all cases and independently from the prevailing mode of failure,
the new local damage index describes well the damage pattern of the analysed
specimens.
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- A distributed shear and flexural flexibility model with shear-flexure interaction for R/C members subjected to seismic loading
- P.E. Mergos ; A.J. Kappos
- Book Title / Journal: Earthquake Engineering and Structural Dynamics,
- Year: 2008 , Volume: 37 , Series:
- Earthquake engineering
- Description
- 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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