masterkey wind loading to bs 6399

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    6 MasterKey Wind Loading to BS 6399 Pt2

    6.1 Introduction

    You can use MasterKey Wind Analysisto quickly and accurately determinewind pressures for any site in Great Britain, using the built-in O.S. location mapor by entering a grid reference. You have a choice of several wind analysismethods with which to refine the wind pressures for your particular site. For theuse of the MasterKey Wind Analysis program as a stand-alone module referexclusively to section 2 in this manual.

    MasterKey Wind Analysis on its own gives you only a fraction of the power of thecomplete system. For you to reap the full benefits, MasterKey Wind Analysisintegrates with the 3D Model Managerto give you the most powerful tools

    available for automatically applying wind loads to any structure. For the use ofMasterKey Wind Analysis with the 3D Model Manager refer to section 3 in thismanual.

    The good news for users throughout Ireland and countries elsewhere in the worldis that you too can unleash the potential of the integrated system. All you need todo is enter the relevant site information and basic wind speed in the MasterKeyWind Analysis to evaluate the wind pressures and then use the integratedsystem to apply the wind loadings to your building.

    6.1.1 MasterKey Wind Analysis

    First we will look at the MasterKey Wind Analysis interface and understand howto use it, before examining how it integrates with the 3D Model Manager andMasterFrame.

    Select the MasterKey Wind Loading to BS 6399 from the Designer Suite menu.

    6.1.2 Choosing a Site Location from the Wind Data Map

    A location is chosen from the MasterKey Wind Analysis site data map or ifoutside Great Britain, a default site can be set up to generate the wind pressuresfor a particular location. Pick a site directly off the map or enter the site gridreferences, if known, to get exact site information. (Note - grid references can beobtained from various internet sites, for example, www. multimap.com, based onthe site address or post code.)

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    Accurate wind and topographical information is contained within the Wind Mapdatabase. This information is used by the program to obtain the wind pressureson a structure as it varies with height and orientation. Several wind diagonallengths can be taken into account. The user can choose which analysis method

    to employ.

    Typical Wind Loading screen (linked to 3D Model Manager)

    The Town/Country, Topographical and Categories maps are displayed at the topright of the screen. Below these, the town/country/sea distances for the localarea and the wind pressure distribution for the site, varying with height, are

    displayed. All the site data and wind pressures are shown in the calculations areaon the left of the screen.

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    6.1.3 Site Data interface

    The Site Data tab enables you to enter a title for each brief, add and sort briefsand select which map type to be the main graphic. The grid references areshown here and can be manually changed if you know the exact grid references

    for your particular site. The basic wind speed and site altitude are given. Thedata for a particular site can be saved as an independent file for future re-loading(Save/Load Site for BREVe2). If the site is outside Great Britain, you can set up afile containing a default (overseas) site, using the Set Default Site button. Thesite information for an overseas site is entered in the following tabs, so that thewind pressures can be accurately calculated.

    When used with the 3D Model Manager, the SiteData tab also allows you to specify the orientation ofyour building relative to the North, so as to ensureaccurate application of the wind loading to theindividual faces of the structure.

    6.1.4 Obstructions interface

    If there are obstructions in the vicinity of the structure being examined, these canbe taken into account by specifying the height of and distance to the obstructionsat intervals of 30 degrees around the building.

    If the orientation of the building is known, the UK Sd factors can be used toreduce the wind pressures around the building. If the orientation is not known oris outside the UK, the Sd factors should be set equal to 1.

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    6.1.5 Sea/Country/Town interface

    Fetch distances and category types are automatically included when a site isselected from the Great Britain map. For a site outside Great Britain, the valuescan be entered manually for each orientation.

    6.1.6 Topography interface

    The local topography can be taken into account resulting in modification of thewind loading. This can be done using the internal data within the wind map or

    altered manually.

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    Alternatively, a previously saved file (*.Shf) can be used to bring the localtopography data into account, or

    the user can set their own data for a site.

    There is also an option to use the site altitude only to evaluate the wind loadingignoring the effects of local topography.

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    6.1.7 Report (Output) interface

    On the Report (output) tab, the user can select which method to employ for thecalculation of the wind loads Standard, Hybrid, Directional or Designers Guide.Having settled on the appropriate method, the screen and printing output options

    can be selected. The basic wind speed automatically selected from the map maybe changed if desired, as can the start and length of the season underconsideration. Building floor levels and wind diagonal lengths can be changedfrom the defaults if necessary (note when used in conjunction with the 3DModel Manager, these values are automatically taken from the model). Select therisk period from the droplist. Finally the graphics scale and number of segmentscan be varied. The wind pressure diagram can be viewed for each wind diagonallength a.

    6.1.8 Printing Results

    MasterKey Wind Analysis results can be printed to a printer or PDF file orexported to Word (PowerPad users) using the Print and PowerPad facilities inthe top menu or the buttons described below:-

    Ensure graphics are always on top.

    Switch graphics on or off when exporting or printing.

    Edit project title and job references.

    Print current or all briefs to printer.

    Export current or all briefs to Word (PowerPad users only).

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    6.1.9 Viewing of Local Category Map and Wind Pressures Diagram

    The local category map and wind pressure diagram can be manipulated usingthe following buttons from the top menu:-

    3D view

    Front view

    Side view

    Plan view (north)

    Elevation

    Place on plan

    Shade wind pressure diagram

    Rotate diagrams

    Alter vertical scale of windpressure diagram

    6.1.10 File Management

    Files and briefs can be managed using the options from the File and Editing

    menus or using the following buttons from the top menu:-

    Open a new file

    Open an existing file

    Save current file

    Delete current brief

    Copy current brief toclipboard

    Add new brief from clipboard

    Add new brief

    Next or Previous brief

    6.1.11 Additional Help on the BreVe2 Wind Loading

    Help can also be found in the BreVe2 Help system, which will have been loadedwhen the Wind Loading module was added to your MasterSeries programs. Toaccess the BreVe2 help, go to Start>Programs>BreVe2>BreVe2 Help andsearch for the required information.

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    6.2 MasterKey Wind Loading + 3D Model Manager

    MasterKey Wind Analysisintegrates with the 3D Model Managerto give youthe most powerful tools available for automatically applying accurate wind loads

    to any structure, saving you time and effort.

    The MasterKey Wind Analysis automatically calculates and applies the weightedexternal pressure coefficient Cpe to be used with each wind loaded member foreach wind direction.

    The value of Cpe is dependent on the wind surface angle to the horizontal , the

    angle between the wind direction and the normal to the wind surface and thewind zone depending on the position of the member within the wind surface andthe building as a whole, the wind zones are:

    A-D and H-K for walls and inclined walls

    A-G and X-Y for flat roofs, and

    A-J and K-S for monopitch and duopitch roofs.

    Wall Zones Flat Roof Zones

    Duopitch Roof Zones (including roof angle)

    Adjustments are automatically made for corner angles , funnelling effects 0.25bto 1.00b, re-entrant corners and both narrow and wide recesses (introducingzone c1 in the wedge).

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    The program will dynamically change all Cpe values for any changes you make

    to wind directions at any time. All angular values including , and and allmember zoning locations are dynamically determined by the program. To ensuremaximum flexibility you will however be able to overwrite some or all of thesevalues.

    The method of application ca