| Abstract [eng] |
Modern long suspension and cable-stayed bridge constructions are relatively light and not resistant for kinematic displacements, which can make a result of wind effect. Stability of a construction against the impact of wind is related to its siffness, cross-section shape. The paper analyzes basic aerodynamic phenomenon’s and their estimation according to LST_EN_1991-1-4_2007 (lt) methodology. The capabilities of a software package COSMOSFloWorks were investigated against wind impact. Relationship between aerodynamic flutter and periodic vortex-sheeding with respect to flow around cross-section estimation. An estimation of wind impact on a cable-stayed bridge was performed. The bridge is planned to be built in Klaipeda city. Damping systems for wind impact and wind inflicted vibrations is analyzed in the paper as well. A periodic vortex-sheeding damping system for the particular bridge is proposed in the paper. The paper is composed of seven parts: introduction, wind impact analysis, wind impact evaluation, investigation of real constructions resistance to wind impact, stabilisation of wind impact, conclusions and results, list of references. The paper is 94 pages long, has 108 illustrations, 9 tables and 41 items in the list of references. |
