Purchase your copy of BS as a PDF download or hard copy directly from the official BSI Shop. All BSI British Standards available. The use of BS part 2:wind loads, for design of temporary structures (English ) Wind loading: a practical guide to BS , wind loads on buildings. PROFESSIONAL. Welcome. IP51S0LUTIONS. Thank you and welcome to ‘ BS Wind Loading – Practical Design, an IStructE seminar presented by.
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Also given are tables which have been derived directly from the equations which will be useful as an accuracy check to those wishing to implement the equations into computer software.
NOTE 3 See references [1] to [4] for examples of established dynamic methods. This becomes even more important if the effects of bx also need to be considered, as the topographic increment Sh can be large.
BS Loading for buildings. Part 2 Wind loads | José García –
In this case, a value of s may be derived from Figure 9a and Figure 9b and Figure 10a and Figure 10b, and the smaller value used. It should be noted that Sh will vary with height above ground level, from maximum near to the ground reducing to zero at higher levels, and with position from the crest, from maximum near the crest reducing to zero distant from the crest.
The equation for this family of curves is: Subscribing members of BSI are kept up to date with standards developments and receive substantial discounts on 66399-2 purchase price of standards.
Two alternative methods are given: P holds well for small values of P. Towards better estimation of extreme winds. Table 1 — Building-type factor Kb Type of building Kb Welded steel unclad flames 8 Bolted steel and reinforced concrete unclad frames 4 Portal sheds and similar light structures with few internal walls 2 Framed buildings with structural walls around lifts and stairs only 1 e.
For porous walls and fences with solidity less than 0. After correction for site exposure, the directional characteristics of extreme winds showed no significant variation with location anywhere in the United Kingdom, with the strongest winds blowing from directions south-west to west. This adjustment requires time to work up through the wind profile and at any site downwind of a change in terrain the wind speed is at some intermediate flow between that for the smooth terrain and that for the fully developed rough terrain.
Bx to the way that parapets around roofs change the positive pressures expected on upwind pitches with large positive pitch angles to suction, neglecting their effect is not always conservative. External pressure coefficients should be determined in accordance with 3.
This load case should be compared with the standard load case defined in Figure 40 and the more onerous condition should be used. This simplification is used in Figure 3 and equation C. However, the reference height Hr is taken as the actual height of the top of the wall above ground.
This approach greatly increased the amount of data available for analysis and enabled the directional and seasonal characteristics of bd UK wind climate to be examined. The standard method generally gives a conservative result within its range of applicability. Combination a is appropriate when the form of the building is well defined, but the site is not; the cases of relocatable buildings or standard mass-produced designs are typical examples.
The the characteristic wind load for static design. Regrettably, indication of copyright fee is not available.
For circular elements whose diameter is greater than about mm the values in this section are conservative. Careers and apprenticeships Equal opportunities Vacancies Apprenticeships. This load case should be allowed for by using a net pressure coefficient of 2. Code de bonne pratique des surcharges vent Title bx German Lasten fuer Gebaeude.
This applies to the sea, but also to inland lakes which are large enough and close enough to affect the wind speed at the site. Moderate porosity in this region, i. Note on directional and seasonal assessment of extreme winds for design. The crosswind breadth B and inwind depth D are defined in Figure 2. NOTE If there are fascias at the eaves or verges see 2.
Other methods may be used in place of the two methods given in this standard, provided that they can be shown to be equivalent. Examples are farmlands and country estates and, 63399-2 reality, all terrain not otherwise defined as sea or town.
BS 6399-2:1997
Advice is given in reference [6]. The scaling length b is determined from the height H and crosswind breadth B of the windward face. When using directional effective wind speeds, use: