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Written via seven the world over identified specialists, the articles during this ebook current the basics and sensible purposes of latest wind engineering. It covers complicated difficulties in wind-building interplay from the point of view of a structural clothier, interpreting either experimental and computational methods and their relative merits.
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Additional info for Wind Effects on Buildings and Design of Wind-Sensitive Structures (CISM International Centre for Mechanical Sciences)
The wind tunnel of BRE, in the UK, has walls in the test sections which are partially open, to minimize blockage effects. 4 Modelling techniques Modelling the building and surroundings. A wind tunnel test is carried out on a scale model of the building and surroundings. This scale model is usually custom made for the wind tunnel research. The model has to be suited to mount specific instruments, and is of a geometric scale, that meets the relevant scaling requirements. The geometric scale Og is defined as: Og LWT LFS (The index WT stands for Wind Tunnel, the index FS stands for Full Scale) The geometric scale needs to be specified in the test report.
In the future, when drafting of a next generation of the Eurocode on Wind Actions, a joint effort to come to a European wind map is strongly recommended. Roughness length, terrain categories and terrain factor. In EN 1991-1-4, 5 terrain categories are defined, with given values for the roughness length z0. These terrain categories are illustrated in Figure 1. Below a minimum height zmin the wind speed at height z = zmin should be used. EN 1991-1-4 leaves national choice for the definition of the roughness classes.
Scruton, C. (1971). Steady and unsteady wind loading of buildings and structures. Phil. Trans. Roy. Soc. London, A 269. pp. 353-383. P. and Bunzli, B. (1995). The influence of surface texture on the effective roughness length. Quarterly Journal of Royal Meteorological Society, 121, pp. 1-21. T. , Surry, D. G. (1979). Internal pressure characteristics of low-rise buildings due to wind action. In: Proceedings of the 5th International Wind Engineering Conference, Vol. 1, Forth Collins, Colorado USA, July.