Cut Angle and Plating Combined,
Framing Member Calculations (U. S. A. Units)
 

Description: This boilerplate template performs combined member area property calculations.  They include the property effects of the cut angle framing member and also the plating to which this framing member is attached.  
 

• These calculations assume that a reference is available that will provide the necessary area properties of the framing member for insertion into this electronic calculation sheet for computing the combined effects with plating attached.

• This MathCAD document calculates the available area properties such as section modulus and moment of inertia.  It does not calculate the required section modulus which is obtained from sources similar to Reference B through D.  In other words two sets of calculations are needed.  First the required section modulus needs to be computed.  Then some available framing members are selected and their combined properties are computed on a electronic document, like this template, to see if the available members meet or exceed the required area properties.

• This template applies to a frame that is cut to accommodate a smaller framing member penetrating through it.  These computations deduct the area property effects of the material lost in this notch.

• The effective plating width, EPW, selected is the lesser of the ABS allowable [1983 Rules for Steel Vessels under 200 feet (61 meters)], 38 times the plating thickness (an industry rule of thumb), or the frame spacing (limited by geometry in this case).  If other classification society classing rules apply, these calculations should be modified to suit applicable the classification society requirements. 

• These calculations apply to U. S. A. Units. But the purchaser may change the template to apply to metric units.

• The material for the framing member must be the same as for the plating member.  Another approach is necessary if this is not the case.  In other words, this approach will work for a steel frame on steel plating or an aluminum frame on aluminum plating.  It will not work for a aluminum frame on steel plating or a steel frame on aluminum plating.

There are advantages and benefits to this calculative method.  First this approach saves you time.  Many computations are quickly done on your input data.  Second this approach provides clear and neat documentation.  These computations can readily be submitted to U. S. C. G. or classification societies if requested.  Third this approach is cost effective because the calculative approach is already developed for you, research time is minimized to familiarization of concepts if necessary and not to time consuming development activities.
 

Electronic Document Type:  MathSoft MathCAD document           Cost: $7.50 US funds
 

Number of Pages: Inputs Page, Outputs Page (2 MathCAD pages).  Instructions and Use Terms Page (1 browser page).                

Inputs:  

• Geometric Properties of Framing Assembly

  • Support Length (or span) of framing member, inches

  • Support Width of framing member, inches

  • Height of Cut into framing member, inches  

• Angle Framing Member Properties, from reference texts, diagram provided

  • Height of Web, inches

  • Thickness of Web, inches

  • Width of Flange, inches

  • Thickness of Flange, inches (if different from web thickness)

  • Area, square inches

  • Area Centroid Distance, inches

  • Moment of Inertia, inches⁴

  • Unit Weight, pounds per foot

• Plating Properties

  • thickness of plating

• Material Properties

  • material density, select steel or aluminum, values provided

Outputs:  

• Area Properties for combined section:

  • Total Area, square inches

  • Centroid of combined area, inches

  • Moment of Inertia about centroidal axis, in⁴

  • Section Modulus for combined section, in³

• Weight Properties of combined section

  • Unit Weight, pounds per foot for combined section

Recommended Reading:

• Reference A: AISC Steel Construction Manual, American Institute of Steel Construction, Chicago, IL.

• Reference B: ABS Rules for Building and Classing Steel Vessels Under 210 feet (61 meters), 1983, American Bureau of Shipping, Houston, TX.

• Reference C: Arthur Edmunds, Designing for Power and Sail, Bristol Fashion Publications, 1998, Harrisburg, PA.

• Reference D: John S. Spencer, Structural Design of Aluminum Crewboats, Marine Technology, July 1975 Issue, Society of Naval Architects and Marine Engineers, Paramus, NJ.

• Reference E: Bruce Roberts-Goodson, The Complete Guide to Metal Boats, International Marine, 2001, Camden, ME.

• Reference F: Dave Gerr, Boat Strength for Builders, Designers and Owners, International Marine, 2000, Camden, ME.

• Reference G: Rawson and Tupper, Basic Ship Theory, Longhams, London

• Reference H: SNAME, Principles of Naval Architecture, Society of Naval Architects and Marine Engineers, Paramus, NJ.

• any strength of materials text 

Terms: Prior to purchase, read our End User License Terms.

Download Now: click the following hyperlink to pay $7.50 fee and then immediately download the zip file containing the template.

Minimum System Requirements: Windows 95/98/NT/2000/XP/Vista/Windows7/later Windows OSs including Windows 11

Sample: A sample portion of a page is shown below.