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Review of some research on the full-scale monitoring of civil engineering structures using GPS

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Chmielewski T., Górski P.

Czasopismo Techniczne

The static and dynamic deformation monitoring of engineering structures has been a matter of concern for engineers for many years. This paper provides a review of research and development activities from 1993 in the field of bridges, tall buildings, and tower health monitoring using GPS. Firstly, early pioneering applications of GPS to measure the structural vibrations of these structures and the assessment of the measurement accuracy of GPS are briefly described. The progress on monitoring the displacements and dynamic characteristics of bridges and tall structures, caused by traffic loads, wind, and the combined influence of solar radiation and daily air temperature variations, is then presented.

Investigations of Strouhal numbers of iced cable models of cable-supported bridges with respect to angle of wind attack

71%

Górski P., Tatara M., Pospišil S., Kuznetsov S., Marušić A.

Czasopismo Techniczne

The influence of the ice accretion, angle of attack and Reynolds number on the flow field around iced cables of cablesupported bridges is not clearly understood. The Strouhal number is one of the most important parameters which is necessary for an analysis of the vortex excitation response of slender structures. This paper presents the method and results of wind tunnel investigations of the Strouhal number of stationary iced cable models of cable-supported bridges. The investigations were conducted in a climatic wind tunnel laboratory of the Czech Academy of Sciences in Telč. The methodology leading to the experimental icing of the inclined cable model in the climatic section of the laboratory was prepared. The shape of the ice on the cable was registered by photogrammetry and numerical evaluation. For the aerodynamic investigations, the iced cable model in a smaller scale was reproduced using a 3D printing procedure. The Strouhal number was determined within the range of the Reynolds number between 2.4·104 and 16.4·104, based on the dominant vortex shedding frequency measured in the flow behind the model. The model was orientated at three principal angles of wind attack for each of the Reynolds number values. In order to recognize the tunnel blockage effect, the Strouhal number of a smooth circular cylinder was tested. Strong agreement with the generally reported value in the subcritical Reynolds number range for a circular cylinder was obtained.

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2 Czasopismo Techniczne

2 2016

2 Górski P.

1 Chmielewski T.

1 Kuznetsov S.

1 Marušić A.

1 Pospišil S.

1 Tatara M.

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Review of some research on the full-scale monitoring of civil engineering structures using GPS

Investigations of Strouhal numbers of iced cable models of cable-supported bridges with respect to angle of wind attack