July 12, 2017

spread-footing-design

ASDIP FOUNDATION is a structural engineering software for design of concrete footings. It includes the design of spread footings based on the latest ACI provisions. Following is a graphical overview of the required steps for spread footing design, with annotated screenshots of the software.

Click here to download ASDIP FOUNDATION free 15-day trial.

Spread footing design steps

spread-footing-design

Enter the footing dimensions in plan and elevation view.

Specify the soil cover and the water table depth.

Click on the Column tab and specify the column dimensions.

The column can be offset in both directions.

If column is a short pedestal, loads will be applied at top of pedestal.

spread-footing-design

At-a-Glance tab shows summary of results, organized by topic.

Select either single pre-combined load, or a set of load cases.

If pre-combined, specify service and factored loads.

Specify the load combinations code, either ASCE 7-05 or 10.

Enter the applied loads. Load cases are D, L, Lr, S, W, and E.

Condensed tab shows more detailed results, organized by topic.

spread-footing-design

Specify material properties for footing and column.

Enter the allowable gross soil bearing pressure.

Detailed tab shows fully detailed results, with exposed formulas and Code references.

Specify soil friction coefficient for sliding resistance.

Specify the soil cover and concrete density.

spread-footing-design

Results show the controlling load combination at each stage.

Enter bar sizes for footing and column.

Specify number of rebars for footing and column.

Specify the direction of the outer bars.

Graph tab shows bearing diagram and values at corners.

Software shows the zero line for partial bearing.

spread-footing-design

Shear tab shows the shear values at the effective distance in both directions.

Flexure tab shows the moments at the effective distance in both directions.

Software shows the controlling combination for each condition.

Double check input and output.

Preview or print out Condensed and Detailed reports.

spread-footing-design

Column tab shows the biaxial interaction diagram at the controlling angle.

Interaction diagram includes the actual load for easier comparison.

Software shows the controlling combination for the interaction diagram.

Software generates scaled sketch of the designed footing showing the reinforcement.

For engineering background, please see my blog post Spread Footings Under Biaxial Bending: A Complex Design Subject.  For our collection of blog posts about foundation design please visit Structural Footing Design.

Detailed information is available about this structural engineering software by visiting ASDIP FOUNDATION. You are invited to download a Free 15-Day Software Trial or go ahead and Place Your Order.

Best regards,
Javier Encinas, PE
ASDIP Structural Software

  • 1- when the settlement of footing or spread to be included in the software or calculation?
    2- reinforcement design for stub column or short column is still limited: rebar type by Asian standard (mm), rebar for rectangle column, stirrup (rebar and spacing)?

    • 1.- The settlement is controlled by the allowable bearing pressure provided by the soils report.
      2.- The purpose of ASDIP Foundation is to design the footing, not the column. The program does check the transfer of forces at the footing / column interface per the code. You can specify metric rebars in the software. For a complete concrete column design module please see ASDIP Concrete instead.

  • Please share the load combination that ASDIP uses in design of Spread footing when Dead, Live and Seismic load is given as input.

    • You can see the controlling load combination for each design condition at the top of each section in the Condensed report.

  • {"email":"Email address invalid","url":"Website address invalid","required":"Required field missing"}
    >