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Assessment indices for the seismic vulnerability of existing R.C. buildings

Thermou, G. E.; Pantazopoulou, S. J.

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Assistant Professor in Structural Engineering

S. J. Pantazopoulou


The seismic vulnerability of old multi?storey reinforced concrete (R.C.) buildings reinforced with substandard details is assessed as a function of interstorey drift demand imposed by the design earthquake while considering brittle termination of elastic response of the critical members of the structure due to a premature shear failure. Interstorey drift demand is related to column and wall translational stiffnesses which are expressed through analytical derivations in terms of the floor area ratios of gravity and lateral load bearing members in the critical floor. Interstorey drift capacity is related to the available transverse reinforcement and the axial load ratio of the vertical members. The significance of the area ratio of vertical members in the typical floor as an index of vulnerability is explored with reference to the limitations in the value of axial load ratio used in R.C. design in order to secure ductile flexural behavior, and also with reference to the stability index of gravity load bearing members. Interstorey Drift Spectra are derived for the existing R.C. buildings suitable for rapid seismic vulnerability screening but also as a guide for rehabilitation of the existing structures. Lightly reinforced or substandard reinforced concrete buildings that reportedly collapsed during previous earthquakes are used as example case studies in order to calibrate the proposed methodology.

Journal Article Type Article
Acceptance Date May 13, 2010
Online Publication Date Jul 21, 2010
Publication Date 2011-03
Deposit Date Dec 3, 2018
Publicly Available Date Dec 5, 2018
Journal Earthquake Engineering & Structural Dynamics
Print ISSN 0098-8847
Publisher Wiley
Peer Reviewed Peer Reviewed
Volume 40
Issue 3
Pages 293-313
Public URL


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