Author(s)

Z. Zembaty & M. Kowalski

Abstract

Experimental investigations of modal properties of cracked reinforced concrete structures Z. Zembaty & M. Kowalski Faculty of Civil Engineering, Technical University of Opole, Poland Abstract Stiffness of reinforced concrete (rlc) structures depend directly on the intensity of cracks which are accepted in many cases, even for sound rlc structures e.g. bridges. The loss of stiffhess due to cracks for a rlc structure from intact state to damage may reach 40-60%. These changes of stiffhess are reflected in the dynamic properties of the structure, being a good indicator of their actual state. The purpose of this paper is to report results of an experiment in which two natural size r/c kames were subjected to progressive damage by seismic excitations on shaking table. Characteristic decrease of natural frequencies and increase of structural damping were observed. The shaking table experiment aimed at working out new methodology for monitoring vibrations of rlc structures to assess their state and r

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