1st Croatian Conference on Earthquake Engineering 1CroCEE 2021

The behaviour of structures subjected to earthquake excitation is mostly defined by their dynamic properties. Also, they indicate the potential structural response to any unwanted dynamic excitations which may lead to uncomfortable feeling of the occupants. One of the factors that influences the structure’s dynamic properties of cast-in-place concrete systems is the construction technology. Furthermore, there is concern about matching the analytically obtained dynamic properties in the design stage with the ones of the real structure. The dynamic response of the structure is completely determined by the structural natural frequencies, damping and corresponding mode shapes which can be evaluated by ambient and forced vibration measurements. The objective of this study is experimental determination of the dynamic properties of full‐scale RC building structures right after their construction.
In this study three residential buildings in Skopje were selected for in-situ determination of their dynamic properties. First one was a 9-story RC frame structure with central shear wall core. Second one was a 10-story building with similar structural system to the first one. The last one was a high-rise shear wall 42-story RC building. The dynamic properties of all three buildings were identified and conclusions regarding the construction quality were drawn. These results will be used as reference values in their continuous structural health monitoring process.