wind responses of constitutive members of a tower-supported steel stack

Abstract

The wind responses of a tower-supported steel stack are not well clarified for lack of the concerning full scale observation data, including both whole system of the stack itself and each truss member of the tower. This paper reports the long period field observation of a tower-supported steel stack at a Kyushu district. The observations were carried out using accelerometers, strain-meters and anemometers positioned at the stack. The observation results are as follows; 1) few dynamic responses of the stack itself were observed, 2) the large acceleration of some brace members due to vortex-induced vibration was observed, 3) the adjacent braces resonated each other, 4) each vibration mode of the adjacent braces was in opposite phase, 5) the larger the vibration acceleration of the brace is, the larger the magnitude of the opposite phase of the vibration modes contributed.