Techno Press

Structural Engineering and Mechanics   Volume 19, Number 5, March30 2005, pages 581-602
Experimental investigation of local damage in high strength concrete columns using a shaking table
Rogerio Bairrao, Rimantas Kaianauskas and Romualdas Kliukas

Abstract     [Full Text]
    In this paper the accumulation of local damage during the cyclic loading in reinforced high-strength concrete columns is experimentally investigated. Two identical column specimens with annular cross-section and spiral reinforcement were designed and two tests, up to failure, under the action of a constant vertical concentrated force and a time-dependent concentrated horizontal force, were carried out at the LNEC shaking tables facility. Sine type signals, controlled in amplitude, frequency and time duration were used for these experiments. The concept of local damage based on local stiffness degradation is considered in detail and illustrated by experimental results. The specimens were designed and reinforced in such a way that the accumulation of damage was predicted by dominating deformations (cracking and crushing of the concrete) while the increasing of the loading values was a dominating factor of damage. It was observed that the local damage of HSC columns has exposed their anisotropic local behaviour. The damage accumulation was slightly different from the expected in accordance with the continuum damage concept, and a partial random character was observed.
Key Words
    high-strength reinforced concrete; column specimen; shaking table; local damage; stiffness degradation.
Rogerio Bairrao; Structures Department, National
Laboratory for Civil Engineering, Av. Brasil 101, 1700-066 Lisboa, Portugal
Rimantas Kaianauskas and Romualdas Kliukas;
Department Strength of Materials, Vilnius Gediminas Technical University, 11 Saul.etekio Ave, 10223 Vilnius-40, Lithuania

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