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Getting Started

 

Introduction

The Galvanising Risk Assessment Program allows quick and easy assessment of the precautions to be taken and suitability of galvanising trusses or individual members due to the influence of LMAC.

 

First Run

The first time you run the program, you will be prompted for your name and your company name. Enter your details in the appropriate box (use the tab key to move between the boxes) and click Next.

 

Main Page

After the login screen, or after the first run you will come to the Main Page.

Yield Stress (N/mm²)

This is the yield stress of the steel member or the steel being used in the truss. This figure is usually 275 or 355, but it is the real yield stress of the material, usually at least 10% more that should be used in this check.

Use the tab key to move to the next box...

 

Carbon Equivalent

This equates the effects of other elements known to increase the hardness of steel to the equivalent pure carbon content. This is typically 0.4 for grade 43, 0.45 for grade 50 steel, but can be more or less. If you click on the '?' button a Carbon Equivalent Calculator will appear. This works out the CE from BS 5135 from the percentages of the other elements, or you can select a carbon content from the table.

 

Thickness Ratio

This is the ratio of the thickness of steel of two cojoining parts (Tmax÷Tmin). For example a 8mm thick tube welded to a 5mm thick flange would give a thickness ratio of 8 ÷ 5 = 1.6

However this does not included end plates on free ends of open sections.

 

Fillet Welds (mm)

This is the leg length of the fillet weld.

 

Butt Weld (mm)

This is the thickness of the butt weld.

 

Depth of Member or Truss (m)

The total depth of the member or truss that is being assessed.

 

Steel Components

Use this list to select the type of components used. The choices are hot or cold rolled, open, box, tube or welded up sections. (Open sections include I-beams, H-beams, angles, flats and channels)

 

Type

Select whether the object being galvanised is a single member, a triangular truss, or a verendeel truss.

Member Triangular Truss Verendeel Truss

 

Trusses

    Total number of internodal members

        This is the total number of members between truss nodes

Triangular Truss

 There are seven lacing and cords between all of the nodes in this truss

Bridge Panel

 There are eight lacing members and cords between all of the nodes in this truss

 

    Depth of deepest component part (m)

        This is the deepest section used in the truss

 

Holes

These are the holes used in the main structural elements of the member or truss including end plates, but not including free standing cleats.

Select the type of holes used by pressing the up and down arrows, or clicking on the relevant button.

 

Type of Structure

In what sort of structure will the member or truss be used.

Select the type of structure used by pressing the up and down arrows, or clicking on the relevant button.

 

Effect of Failure

What will be the effect, if the member or truss fails. There are three options:

  • Catastrophic collapse
  • There are out of plane members which could prevent collapse
  • Intermediate

Select the effect of failure by pressing the up and down arrows, or clicking on the relevant button.

 

Score

As long as there have been no errors in the input (displayed in the Errors Box at the bottom of the page), the total score for the member or truss will be displayed in the Score box. If you are happy with this result then you can get a print out by pushing 'Print'