An experimental study of a midbroken 2-bay, 6-storey reinforced concrete frame subject to earthquakes

P. S. Skjærbæk*, B. Taşkin, P. H. Kirkegaard, S. R.K. Nielsen

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

3 Citations (Scopus)


A 2-bay, 6-storey model test reinforced concrete frame (scale 1:5) subjected to sequential earthquakes of increasing magnitude is considered in this paper. The frame was designed with a weak storey, in which the columns are weakened by using thinner and weaker reinforcement bars. The aim of the work is to study the global response to a damaging strong motion earthquake event of such buildings. Special emphasis is put on examining to what extent damage in the weak storey can be identified from global response measurements during an earthquake where the structure survives, and what level of excitation is necessary in order to identify the weak storey. Furthermore, emphasis is put on examining how and where damage develops in the structure and especially how the weak storey accumulates damage. Besides the damage in each storey the structure is identified by a static load at the top storey while measuring the horizontal displacement of the stories and also visual inspection is performed. From the investigations it is found that the reason for failure in the weak storey is that the absolute value of the stiffness deteriorates to a critical value where large plastic deformations occur and the storey is not capable of transferring the shear forces from the storeys above so failure is unavoidable.

Original languageEnglish
Pages (from-to)373-384
Number of pages12
JournalSoil Dynamics and Earthquake Engineering
Issue number6
Publication statusPublished - Aug 1997


The present research was partially supported by The Danish Technical Research Council within the project Dynamics of Structures.

FundersFunder number
Teknologi og Produktion, Det Frie Forskningsråd


    • Damage assessment
    • Midbroken structures
    • Modal identification
    • Model testing
    • Reinforced concrete structures


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