Identification of Dynamic Properties of Low-Rise RC Building by Ambient Vibration Measurements During Construction

Abstract eng:
Dynamic properties of a building play an important role in the determination of the equivalent lateral forces as well as responses from natural disturbances such as seismic and wind forces. To quantify these properties, a measurement approach is considered to provide the most accurate results, and an alternative approach of the numerical analysis yields more comprehensive results. Thus the combined study of the measurement and numerical analysis are complementary and would provide more rational outputs. In particular, more comprehensive information on building’s characteristics could be obtained from measurements taken during several different stages of construction than from only a single measurement at the complete stage of the building. This paper presents results of a study on dynamic testing and numerical analysis of a 6-story RC building with an attempt to develop more understanding and add more informative results for the problem in this area. The influence of masonry walls and foundation flexibility on the natural frequencies, damping ratios and mode shapes were extensively examined through ambient vibration measurements in conjunction with numerical modeling. An examination began just after completion of the structural frame and continued at 12 different stages of construction until the masonry infill wall was completely in place and the building was occupied. The calculations from finite element models at each stage had been conducted and their results were compared to the results from measurement. The increases in natural frequencies of the building with the amount of partition masonry wall are discussed. The effect of soil-structure-interaction is examined from the modal parameters obtained at different stages.

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