Author(s)

D. Makovička, J. Král & D. Makovička Jr.

Abstract

This paper deals with verification analysis of the wind response of a power plant stack structure. Over a period of two weeks the actual history of the dynamic response of the structure, and the direction and intensity of the actual wind load was measured, reported and processed with the use of a computer. The resulting data was used to verify the design stage data of the structure, with the natural frequencies and modes assumed by the design and with the dominant effect of other sources on the site. In conclusion the standard requirements are compared with the actual results of measurements and their expansion to the design load. Keywords: stack structure, wind load, dynamic response, experimental verification. 1 Introduction The stack structure of a desulphurization absorber (Figure 1), consisting of a steel skeletal tower structure adjoining the absorber vessel, terminates in a GRP (glass fiber reinforced plastics) extension. The purpose of the analysis is to assess the response of the steel tower structure and its GRP extension with reference to the design loads [1]. The work is based on a theoretical as well as an experimental analysis of the structure. The experimental verification of the dynamic response was based on the measurements of the vibrations of both the steel parts and the GRP parts of the structure excited by the effects of wind and other sources generated by the machines in the power plant area, and by a test pulse generated by a hammer impact on the wall of the GRP extension. The vibration measurements proceeded repeatedly in an extended form (an increased number of monitored points) with reference to instantaneous excitation values

Keywords

stack structure, wind load, dynamic response, experimental verification.