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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Larger overhangs should be treated as open-sided buildings, with internal pressure coefficients determined using the provisions of 2.

In practice, option b will not produce significantly lower values than a unless the combination of location, exposure and topography of the site is unusual.

External pressure coefficients for zones O and P on the downwind faces are given in Table NOTE The pressure coefficients for non-vertical walls in Table 29 are essentially identical to the pressure coefficients for steep pitched roofs in 3. The main disadvantage of methods using only annual maximum values is that many other useful data within each year are discarded.

Procedures are also given to enable the standard effective wind speed to be used with the directional pressure coefficients and for the directional effective wind speeds to be used with the standard pressure coefficients.

This shows the stages of the standard method, together with the relevant clause numbers, as the boxes outlined and connected by thick lines. The estimation of extreme winds.

The loaded zones on the face are divided into vertical strips immediately downwind of the upwind edges 6399- the upper and lower part of the face formed by the cut-out. Opportunity has also been taken to incorporate editorial changes to some clauses for better clarity.

Compliance with a British Standard does not of itself confer immunity from legal obligations. NOTE 3 When the result of interpolating between positive and negative values is in the range —0. The relevant plan-shape for calculating b is that of the whole building. Date Comments 27 March Indicated by a sideline in the margin The following BSI references relate to the work on this standard: Examples are farmlands and country estates and, in reality, all terrain not otherwise defined as sea or town.

## BS 6399-2:1997

Values of frictional drag coefficient should be obtained from Table 6 and the resulting frictional forces combined with the gs forces as described in 2. NOTE 4 If a building is susceptible to excitation by vortex shedding or other aeroelastic instability, the maximum dynamic response may occur at wind speeds lower 63999-2 the maximum. Standard method 2 Licensed copy: When necessary, interpolation should be used between the orthogonal wind directions to obtain values for the other wind directions.

A-frame buildings, are also better interpreted as duopitch roofs, falling under the provisions of 3. NOTE 6 The design risk for nuclear installations, corresponding to a mean recurrence interval of 10 years. NOTE When the bz direction is normal to the eaves, i. Although this standard does not cover offshore structures, it is necessary to define such a category so that the gradual deceleration of the wind speed from the coast inland can be quantified and the wind speed for any land-based site can be determined.

The pressure coefficients for zones A, B and C may then be obtained from Table 5. It is the constant aim of BSI to improve the quality of our products and services.

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### BS Loading for buildings. Part 2 Wind loads | José García –

BS also gives values for external pressure coefficients for a greater range of building configurations than did CP3: This results in a load case for each wind direction for which pressure coefficients are given, usually twelve. Determines the effective wind speeds required by Stage 3: Sidelining in this document indicates the most recent changes by amendment. Contact the Information Centre. Vertical or inclined sections may be taken as being divided into parts of length at least twice the crosswind breadth, L U 2B, and the reference height Hr should be taken as the height above ground of the top of each part.

In the standard method these coefficients standard and directional method. NOTE Instead of calculating the crosswind breadth B and inwind depth D for the complex building plan, these dimensions may be determined from the smallest rectangle or circle which encloses the plan shape of the upwind wing or of the whole building, respectively.

NOTE Wind load on a partially completed structure may be critical and will be dependent on the method and sequence of construction.

Specialist advice should be sought for building shapes and site locations that are not covered by this standard. Combination a is appropriate when the form of the building 63992 well defined, but the site is not; the cases of relocatable buildings or standard mass-produced designs are typical examples.

Its use is also a move towards harmonization as mean values sometimes 10 min means are often the basis for wind loading calculations in European and International Standards.

More details are hs in reference [6]. The standard bx uses a simplified allowance for significant topography, as defined in Figure 7. In this case, a value of s may be derived from both Figure 9 and Figure 10 and the smaller value used. At a change from a smoother to a rougher surface the mean wind speed is gradually slowed down near the ground and the turbulence in the wind increases. Zones of pressure coefficient are defined for each section from the upwind corner as given in Figure bd As the fitted equations are empirical, it is most important that values of the parameters to the equations are restricted to the stated ranges, otherwise invalid values will be generated.

Where the building or element shape falls outside the scope of the tabulated pressure coefficients in 2.