Steel Beams With Web Openings Calculation Spreadsheet

Steel Beams With Web Openings Calculation Spreadsheet

 

This spreadsheet determines whether a steel beam with known loads, and hence known Moments and Shears, can have web openings added. The first worsheet will determine if an opening can be added at a specific location without reinforcement. The second worksheet goes through the same check as the first and then determines what reinforcing is necessary. The third spreadsheet is the steel data tables as made available by AISC.

Calculation Reference
AISC

 

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Design Of Spread Footing As Per ACI 318-07 Spreadsheet

Design Of Spread Footing As Per ACI 318-07 Spreadsheet

 

  • PIPE SUPPORT FOUNDATION
  • DESIGN OF SPREAD FOOTING TO ACI 318-07
  • DESIGN OF ISOLATED FOOTING

    Density Of Concrete
    Density Of Soil
    Depth Of Foundation
    Soil Bearing Capacity
    Length Of Footing
    Width Of Footing
    Thickness of Fdtn.
    Width Of Pedestal
    Length Of Pedestal
    Height Of Pedestal
    Coefficient Of Friction
    Ground Water Table Ht.

    1.0  Load Calculation for Footing & Soil:
    Self Wt. Of Footing
    Weight of Soil
    Self Wt. Of Pedestal
    Weight of Footing + Soil

    2.0 Check Maximum and Minimum Pressure at Footing Base:
    Area of Footing
    Section Modulus
    Section Modulus
    Total Vertical Load

    3.0 Check for Overturning:
    Overturning Moment
    Due to External Load
    Due to wt. of Pedestal
    Due to Self Wt. of Fdn
    Due to Wt. of Soil
    Total Stabilizing Moment
    F.O.S. against Overturning

    4.0 Check for Sliding:
    Resultant Shear Force
    Total Vertical Load
    F.O.S. against Sliding

    5.0 Load Case Check:
    Check Max. & Mini. Pressure at Footing Base:

    6.0 Check for Overturning & Sliding:

    7.0 Check For Shear
    a) Two Way Shear
    b) One Way Shear

    8.0 Design Of Foundation/Footing:
    a) Calculation of Reinforcement at Bottom
    b) Calculation of Reinforcement at Top

This presents the design of isolated spread footing using the results from Staad Support Reactions.

Calculation Reference
Reinforced Concrete Footings

 

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Design Of Ships Masts Spreadsheet

Design Of Ships Masts Spreadsheet

 

This spreadsheet incorporates Vessel motion loading with Environmental Criteria in estimating stresses for mast designs. It covers both unstayed and stayed mast in SI unit and Imperia unit. Although it is being specifically doctored for mast, it could be adapted for estimating stresses of similar structures on floating unit such include Burner boom, Derricks etc. The calculation is referenced to Design of Ships masts R.W. Milliman published by the Association of Engineering and Shipbuilding Draughtsman AESA.

Calculation Reference
Design of Ships Masts

 

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Tubular Joints in Offshore Structures As Per API RP2A (WSD) Spreadsheet

Tubular Joints in Offshore Structures As Per API RP2A (WSD) Spreadsheet

 

This spreadsheet defines the principle terms and ratios used in tubular joint design. It presents the classifications for T, Y, X, N, K and KT joints and the details of joint arrangements. It describes design methods for static strength.

The main structure of a topside consists of either an integrated deck or a module support frame and modules. Commonly tubular lattice frames are present, however a significant amount of rolled and built up sections are also used. This calculation sheet refers to the design of tubular joints. These are used extensively offshore, particularly for jacket structures.

Only static check is performed here, fatigue check shall be added in further revisions.

Calculation Reference
Tubular Steel Construction

 

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Design Of Concentrically Loaded Isolated Footing Spreadsheet

Design Of Concentrically Loaded Isolated Footing Spreadsheet

 

The footings were proportioned so that the bearing pressure does not exceed the safe bearing capacity of the soil. The bending moments and shears are determined at critical sections. The calculation follows methods set out in ACI 318-08.

Calculation Reference
Reinforced Concrete Design

 

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Angle Type Tension Fitting Calculation Spreadsheet

Angle Type Tension Fitting Calculation Spreadsheet

Purpose of calculation: Calculate stress in a ‘angle’ tension fitting.
Calculation Reference: UK railway industry method (the British Rail “Brown Book” method).
Note: requires XlXtrFun addin (interp function).
Calculation Validation: Independent verification is required.

Calculation Reference
Peterson’s Stress Concentration

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Angle Section Properties Calculation Spreadsheet

Angle Section Properties Calculation Spreadsheet

 

If you are like me you may have found out the hard way that the values published in the 13th Edition AISC manual for the principle axis section modulus for angles are incorrect. Although the values for principle axes moment of inertia are correct, an incorrect value of “c” was consistently used to obtain the section modulus. In addition to the principle axis properties and orientation of the principle axes with respect to the geometric axes, Version 2.0 now includes the following:

1. The ability to specify orientation of the angle legs and to subsequently calculate the section properties about the modified axis orientation. The following are addressed SLVD Unequal leg – short leg vertically SLVU Unequal leg – short leg vertically up LLVD Unequal leg-long leg vertically down LLVU Unequal leg – long leg vertically up EQVLD Equal leg – long leg vertical down EQVLU Equal leg – long leg vertically up

2. Calculation of the Beta w factor which is utilized in the 13th Edition AISC Manual – equation F10-6 for calculation of allowable moments about the major principle axis for unequal length angles. The proper sign of Beta w is also calculated which is dependent upon whether the shear center is in flexural compression or tension.

3. Calculation of the torsional resistance factor J

4. Calculation of the extreme fiber distances from neutral axis to all angle tip points. The worksheet is protected but without a password

Calculation Reference
AISC 13th Edition

 

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