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	Combined effect of passive damping element and soil-structure interaction on dynamic behaviour of tall slender structure Hračov, Stanislav ; Macháček, Michael The presented paper is focused on the investigation of dynamic behaviour of tall slender structure taking into account SSI and a presence of TMD. The main aim was to qualitatively and quantitatively assess effect of both phenomena on changes in basic dynamic properties in relation to classically damped fixed-base structure. In particular, the differences in resonant frequencies, in the effective damping and in the character of the dynamic response were studied. Úplný záznam
	Dynamic analysis of tall slender structure equipped with passive absorber and founded on various subsoils using simplified model Hračov, Stanislav The paper is focused on the investigation of dynamic behavior of tall slender structures taking into account the soil-structure interaction effect (SSI) and a presence of a tuned mass damper (absorber). The main aim is to qualitatively and quantitatively assess effects of both phenomena on changes in basic dynamic properties and response of the structure. The real tower equipped with absorber is chosen and analyzed. Analytical and numerical analysis of modal properties and of the response of a simple discrete model are performed. The structure and absorber are represented by one degree of freedom, the interaction interface by spring-dashpot system. This simplified model together with multi degree of freedom discrete model is analyzed parametrically for different dynamic properties of subsoil to cover all possible dynamic effects. The influence of neglecting of both phenomena is quantified and suggestions for assessments of such a type of structures are proposed. Úplný záznam
	Modal analysis of tall slender structures using software GMAST Hračov, Stanislav ; Pospíšil, Stanislav ; Brůna, Tomáš The paper is concerned with a verification of modal properties of tall slender structures computed by recently developed software GMAST. Software GMAST determines eigen-frequencies, eigen-modes and corresponding modal quantities of stacks, towers, guyed masts and similar civil engineering structures using slope-deflection method. A numerical model is based on an idealization of the structure as a continuous 2D beam with continuously distributed parameters on elastic supports. Shaft of structure is divided into sections which could be considered as prismatic i.e. with constant unit mass, bending stiffness and static axial force. The effect of guy ropes is introduced in a form of elastic supports with a frequency dependent stiffness. The applicability of the software in praxis is presented on an example of existing structures, for which the numerically and experimentally identified modal properties are compared. Úplný záznam

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