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Pad Foundation Design per Eurocode 2 Equations and Calculator

Pad Foundation Design Equations and Calculator per Eurocode 2

Pad foundation design, Geotechnical design calculations include:

  • Allowable bearing capacity by Brinch Hansen
  • Preliminary sizing of pad footing
  • Ultimate bearing pressure
  • Flexure design
  • Determine K for respective MED
  • Area of tensile reinforcement
  • Number of reinforcement bars
  • Minimum reinforcement requirements
  • Maximum reinforcement requirement
  • Shear design
  • Design punching shear stress
  • Concrete shear capacity (without shear reinforcement)

EN 1992 Eurocode 2 applies to the design of buildings and other civil engineering works in plain, reinforced and prestressed concrete. It complies with the principles and requirements for the safety and serviceability of structures, the basis of their design and verification that are given in EN 1990: Basis of structural design. EN Eurocode 2 is concerned with the requirements for resistance, serviceability, durability and fire resistance of concrete structures.

Precision:

Input- Insert the dimensions of the foundation and the column cross-section, the loads with their respective safety factors, the material properties and the groundwater level-only if it's applicable.

Section
Column size (x,y) m
m
Depth (h) m
Width (B) (x axis) m
Concrete cover m
Length (l) (y axis)

m

 

Load and material
Dead load kN
Live load kN
Moment kNm
Concrete grade
Steel grade
Bar size

 

Allowable bearing capacity and soil properties
Internal shear angle (Φ) °
Cohesion (C) kN/m2
Unit weight of soil kN/m3
Depth of the foundation from the ground level m
Bearing capacity safety factor

 

Ground water effect
m
INERT VALUE & TICK THE BOX if the ground water table is at a depth less than the width of the foundation from the base of the foundation. Insert a or b values if the GWL is above or below the base of the foundation, respectively.

Pad footing

This application Requires Premium Membership to execute calculations

Output results - This will calculate the preliminary sizing (length) in the section table and design a pad foundation for flexure and shear in the tables below from the design input data in the table above.

Geotechnical analysis
Allowable bearing capacity

kN/m2
Ultimate design pressure

kN/m2
Flexure analysis
Along the shorter span Along the longer span
Bending moment (MED)

kNm

kNm
Effective depth (d)

m

m
K value

Required steel area (As)

mm2

mm2
Reinforcement bar spacing

mm

mm
Provided steel area (As)

mm2

mm2

This application Requires Premium Membership to execute calculations

Shear analysis Remark
Shear stress at the face of the column (vED,max)

MPa

Concrete maximum shear strength (vRd,max)

MPa

Beam shear stress at distance d from the column (vED)

kN/m

Mpa

Punching shear stress at controlled perimeter u1 (vED)

kN/m

MPa

Steel ratio

%
Concrete shear resistance (vRD,c)

MPa

Equations used for Steel Column Design Calculator

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Source:

Alazar Woldeyohannes
Master's program in Structural Engineering in the School of Mechanical, Aerospace and Civil Engineering
University of Manchester
Email available on request

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