Kotenko K. Theoretical and experimental dynamic monitoring of spatial structures during construction and exploitation

The thesis is devoted to the control problem of the technical state of spatial building structures during their construction and operation. Its purpose is to develop a methodology for complex theoretical and experimental dynamic monitoring of buildings of this category. Typical representative of these structures in the studies was used the structure of the International Exhibition Center in Kiev. As a result of the carried out researches it is proved expediency of using dynamic monitoring in the system of control of such structures, as controllable indicators are used natural frequencies, forms of natural oscillations and damping decrement of the oscillation process. Two variants of the finite-element model of the building were developed, which allow to control the indicators by the theoretical-calculation method. The use of software complexes Femap with NX Nastran and SCAD had been use. The verification and adaptation of the model to the practical conditions of operation of the IEC structure were done yet. On the basis of information materials, an experimental version of the dynamic monitoring of the structure, including hardware-instrumental, software and operational support of the monitoring system was developed. With the help of the finite element model, monitoring points of the controllable structure were defined, axial forces, bending moments in its structural elements were calculated, general stability of the structure was determined, values of the natural frequencies at different loads were calculated, defined forms of natural oscillations of the structure, corresponding to their natural frequencies. Effectiveness of theoreticalexperimental monitoring was ascertained to identify structural defects of the building, to determine the tendency and speed of their changes. The functions of calculation and experimental methods were distributed. The algorithm of their interaction in the complex system of theoretical and experimental dynamic monitoring of spatial structure is provided, which is provided by the developed methodology. Other aspects of the problem of dynamic monitoring of spatial structures were studied and possible directions of its improvement were determined.