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Wind effects on suspension bridge steel towers
In connection with the planned building of a network of highways in Poland, it will become necessary to construct many bridges, particularly in cities and over the main watercourses. These are to be modern long-span structures such as, for example, suspension or cable-stayed bridges. Structures of this kind, however, are very sensitive to the adverse action of wind as the research connected with the design of spans and supports for them has shown. This is confirmed by bridge failures and disasters that still unfortunately happen. The wind-induced response of suspension bridge towers has been examined by various wind tunnel testing procedures. The details of the tested model structures and the investigation procedures are described. Some problems encountered during the testing and the way in which they were overcome are presented. Several kinds of gauges, the mean measuring ranges and the measured values are also presented. The tower models were tested in laminar flow conditions. The vortex-induced oscillations of the tower models are discussed by comparing the obtained aerodynamic force amplitudes and pressure distributions. The selected results of the research, like the effects of the wind yaw angle and the cross-sectional shapes of the models, compared with regard to the pressure distribution and the measured aerodynamic forces are presented. Also the wind-induced vibrations of the aerodynamic forces, the power spectra and the vibration frequencies obtained on the basis of the wind tunnel tests are shown.
Wind effects on suspension bridge steel towers
In connection with the planned building of a network of highways in Poland, it will become necessary to construct many bridges, particularly in cities and over the main watercourses. These are to be modern long-span structures such as, for example, suspension or cable-stayed bridges. Structures of this kind, however, are very sensitive to the adverse action of wind as the research connected with the design of spans and supports for them has shown. This is confirmed by bridge failures and disasters that still unfortunately happen. The wind-induced response of suspension bridge towers has been examined by various wind tunnel testing procedures. The details of the tested model structures and the investigation procedures are described. Some problems encountered during the testing and the way in which they were overcome are presented. Several kinds of gauges, the mean measuring ranges and the measured values are also presented. The tower models were tested in laminar flow conditions. The vortex-induced oscillations of the tower models are discussed by comparing the obtained aerodynamic force amplitudes and pressure distributions. The selected results of the research, like the effects of the wind yaw angle and the cross-sectional shapes of the models, compared with regard to the pressure distribution and the measured aerodynamic forces are presented. Also the wind-induced vibrations of the aerodynamic forces, the power spectra and the vibration frequencies obtained on the basis of the wind tunnel tests are shown.
Wind effects on suspension bridge steel towers
Windeinflüsse auf Hängebrücken
Manko, Z. (author) / Wdowiak, M. (author)
Structural Steel Developing Africa, 1996 ; 185-192
1996
8 Seiten, 6 Bilder, 5 Quellen
Conference paper
English
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