Foundation Design

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Spread Footings Under Biaxial Bending: A Complex Design

By: Javier Encinas, PE | October 9, 2019 ASDIP FOUNDATION is a structural engineering software for footing design. It includes the design of concrete spread footings based on the latest ACI 318 provisions. This article discusses the complexities inherent to the design of spread footings when subjected to a combination of vertical and horizontal loads, and biaxial bending. For a simple spread footing with a vertical concentric compression load, the resulting bearing pressure is uniform and the shear and bending can be calculated easily by hand. If the column is at the corner of a building, then biaxial moments could [...]

By |2019-11-07T15:53:01-05:00October 9th, 2019|Categories: Foundation Design|Tags: , |2 Comments

Eccentric Combined Footing Example Using ASDIP FOUNDATION

By: Javier Encinas, PE | October 1, 2019ASDIP FOUNDATION is a structural engineering software for the design of concrete footings. It includes the design of combined footings, based on the ACI 318 provisions. This document is a step-by-step design example of an eccentric combined footing using ASDIP FOUNDATION software.Combined footing exampleAs an example, consider the combined footing shown below, which is part of the foundation of an industrial building. The left column is very close to the property line and it has a relatively light load compared to the adjacent interior column. Design the size, thickness and reinforcement of a [...]

By |2019-11-20T10:00:44-05:00October 1st, 2019|Categories: Foundation Design|Tags: , |0 Comments

Strap Footing Design Example Using ASDIP FOUNDATION

By: Javier Encinas, PE | June 11, 2019ASDIP FOUNDATION is a structural engineering software for the design of concrete footings. It includes the design of strap footings, based on the ACI 318 provisions. This document is a step-by-step design example of a real-life strap footing using ASDIP FOUNDATION.Strap footing design exampleAs an example, consider the strap footing shown below, which is part of a steel retail building, with columns spaced in a 20 ft x 20 ft grid. One exterior column is located very close to the property limit. As a result, the column will be eccentric on the footing. [...]

By |2019-11-20T10:03:46-05:00June 11th, 2019|Categories: Foundation Design|Tags: , |2 Comments

How to Design Uplift Footings Using ASDIP FOUNDATION

By: Javier Encinas, PE | January 31, 2019ASDIP FOUNDATION is a structural engineering software for the design of concrete footings. It includes the design of uplift footings, based on the ACI 318 provisions. This document covers the design of footings subject to uplift loading using ASDIP FOUNDATION.Uplift loads may be applied to a footing for a number of reasons, but the most common uplift loads are due to wind. For example a light warehouse building in a hurricane zone can be exposed to this kind of uplift loading. In such cases, the gravity forces due to footing selfweight, pedestal and [...]

By |2019-11-16T15:11:25-05:00January 31st, 2019|Categories: Foundation Design|Tags: , |2 Comments

Combined Footing Real-Life Example Using ASDIP FOUNDATION

By: Javier Encinas, PE | November 14, 2018 ASDIP FOUNDATION is a structural engineering software for the design of concrete footings. It includes the design of combined footings, based on the ACI 318 provisions. This document is a step-by-step design example of a real-life combined footing using ASDIP FOUNDATION software. Combined footing example As an example, consider the combined footing shown below, which is part of the foundation of a pipe rack in an industrial plant. A typical bent consists of two steel columns closely spaced that share the same footing. The pipe rack is exposed to dead, live, and [...]

By |2019-11-20T09:54:09-05:00November 14th, 2018|Categories: Foundation Design|Tags: , |2 Comments

Spread Footing Real-Life Design Example Using ASDIP FOUNDATION

By: Javier Encinas, PE | October 15, 2018ASDIP FOUNDATION is a structural engineering software for the design of concrete footings. It includes the design of biaxial spread footings, based on the ACI 318 provisions. This document is a step-by-step real-life spread footing design example using ASDIP FOUNDATION.Spread footing design exampleAs an example, consider the spread footing shown below, which is part of a building expansion. The new footing is adjacent to an existing footing, and the dimensions are also affected by the proximity of the property limit. As a result, the column will be eccentric in both directions. Design the [...]

By |2019-11-20T11:09:25-05:00October 16th, 2018|Categories: Foundation Design|Tags: , |0 Comments

Footing Design: How to Check the Shear Capacity per ACI 318

By: Javier Encinas, PE | August 14, 2017 The foundation is that part of the structure that transfers the loads to the supporting soil in such a way that the resulting bearing pressures are kept under acceptable limits. If the underlying soil is satisfactory, then a spread footing is usually the recommended solution by the soils engineer. In addition to the stability checks and the design for flexure, a spread footing needs to be designed for shear. This blog post discusses the shear checks required by ACI 318. Our software ASDIP FOUNDATION will be used to support our discussion. [...]

By |2019-11-23T11:44:07-05:00August 14th, 2017|Categories: Foundation Design|Tags: , |0 Comments

Spread Footing Design Using ASDIP FOUNDATION

By: Javier Encinas, PE | July 12, 2017 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. Spread footing design steps Click To Enlarge 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 [...]

By |2019-11-19T11:52:36-05:00July 12th, 2017|Categories: Foundation Design|Tags: , |4 Comments

Combined Footings: How to Calculate the Bearing Pressures

By: Javier Encinas, PE | June 27, 2017 ASDIP FOUNDATION includes the design of concrete combined footings. This structural engineering software is based on the latest ACI 318 provisions. This post explains the calculation of the soil bearing pressures in a typical combined footing. A combined footing usually supports two columns. The use of a combined footing may be justifiable under conditions where the distance between columns is short, so a large excavation is not required. There are two common scenarios in practice: A property line exists at or near the edge of an exterior column, so a normal isolated footing [...]

By |2019-11-23T09:21:02-05:00June 27th, 2017|Categories: Foundation Design|Tags: , |0 Comments

Anchor Rods: How to Calculate the Tension Concrete Breakout Capacity

By: Javier Encinas, PE | June 14, 2017 Anchor rods are elements designed to resist mostly tension forces, sometimes in combination with shear. Out of all the tension limit states required by ACI 318, concrete breakout is particularly important because a concrete failure would be non-ductile, and therefore it should be avoided. This blog post discusses how to calculate the concrete breakout capacity of anchor rods. I will use our software ASDIP STEEL to support the discussion. What is the tension concrete breakout? Concrete breakout assumes a failure forming a concrete cone based on a [...]