This paper deals with pressure measurement on the surface of the elliptic cylinder. Aerodynamic properties are not same for different shape of the building. Therefore it is important complex experimental measurement for complicated shape. Aim of the article is to understanding the wind loads on building for various arrangements. Results are external pressure coefficients of elliptic model for various rotations. Conclusion of the experiment is to find optimal and critical wind direction for isolated building. This research will be background for future work of interference effect.
This article deals with issue of creation test reference year of Bratislava area. It describes the selection of the worst year from years 1996 - 2012 (17 years) according to the hygrothermal performance of building envelope. For comparison and selection the HAM simulation program WUFI was used. Two walls were taken into account aerated clay brick and aerated clay brick wall with ETICS based on EPS polystyrene insulation.
Wind loads on buildings are evaluated by using codes and standards. They are based on wind tunnel tests, which are performed on an isolated model in open exposure. Measurements by several researchers have shown that wind loads on real objects are considerably different than those on an isolated building. Structures around building decrease or increase the forces on building. This effect is termed interference. Interference includes geometry, layout and orientation of surrounding objects. Further aspects are direction of the wind and terrain conditions. For this reason it is necessary to evaluate interference before planning. The aim of the article is to overview the recent research, comparison between an isolated building and a group of buildings, to name the interference parameters and explain how they modify the forces on building. Also attempt to provide general recommendations for elementary models because this problem has large number of variations, especially for complicated models where it is necessary to evaluate the specific type of building. These recommendations should be used by designers and planners of the buildings.
This paper deals with experimental measurement of pressures on the cube made in the wind tunnel of Aerospace Research and Test Establishment (VZLU) in Prague Letnany and calibrating the wind tunnel of Faculty of Civil Engineering in the Slovak University of Technology in Bratislava. The basis for the construction of the cube model in 1:30 scale was the cube in-situ with dimensions of 6 m in Great Britain in town called Silsoe. It describes the scope and application in practice.
This paper deals with the basic simulation of boundary layer in the wind tunnel in STU Bratislava and boundary layer given in the Slovak Technical Standard STN EN 1991-1-4 in Bratislava for category of terrain no. IV. The wind tunnel mainly allows experiments to determine the realistic reproduction of the static and dynamic response of a scale models of the buildings and structures immersed in a turbulent flow which simulates the natural wind in various categories of terrain. We have to deal with similarity criteria of modeling the objects, measuring the pressure and the velocity of flow in the tunnel by using the whole range of devices such as Pitot static probe, Constant Temperature Anemometry, Particle Image Velocimetry etc. all under the control in the program Labview developed by National Instruments .Than we are able to measure the pressure coefficients or any other parameters needed for design of buildings and structures of any shape and size, allowed by tunnel dimensions, placed on a different types of terrain roughness. The most recent research in new BLWT was calibration and simulation of boundary layer in the rear space of the tunnel.
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