Foundation Design

/Tag:Foundation Design

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. What [...]

By | August 14th, 2017|Categories: Foundation Design|Tags: , |0 Comments

How to Design Spread Footings 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 design steps, with annotated screenshots of the software. 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 in both directions. If column is a short pedestal, loads [...]

By | July 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 | June 27th, 2017|Categories: Foundation Design|Tags: , |0 Comments

Anchor Rods: How to Calculate the Tension 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 breakout capacity of anchor rods. I will use our software ASDIP STEEL to support the discussion. Concrete breakout assumes a failure forming a concrete cone based on a prism angle of 35 degrees. This method predicts the strength [...]

Strap Footings: How to Calculate the Bearing Pressures

By: Javier Encinas, PE | April 16, 2017 ASDIP FOUNDATION includes the design of concrete strap 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 strap footing. A strap footing usually supports two columns, so it's a special type of combined footing. If a property line exists at or near the edge of an exterior column, a normal isolated footing would be placed eccentrically under this column and it would tend to tilt. This problem may be prevented by connecting this footing with [...]

By | April 17th, 2017|Categories: Foundation Design|Tags: , |0 Comments

Strap Footings: A Very Useful Structural System

By: Javier Encinas, PE | May 8, 2016 ASDIP FOUNDATION includes the design of concrete strap footings. This structural engineering software is based on the latest ACI 318 provisions. This post covers the steps in the design of strap footings when subjected to a combination of vertical loads, horizontal loads, and bending moments. A strap footing usually supports two columns, so it's a special type of combined footing. If a property line exists at or near the edge of an exterior column, a normal isolated footing would be placed eccentrically under this column and it would tend to tilt. This [...]

By | May 8th, 2016|Categories: Foundation Design|Tags: |4 Comments

Combined Footing: An Important Structural Design Element

By: Javier Encinas, PE | April 24, 2016 ASDIP FOUNDATION includes the design of concrete combined footings. This structural engineering software is based on the latest ACI 318 provisions. This post covers the steps in the design of combined footings when subjected to a combination of vertical loads, horizontal loads, and bending moments. If a property line exists at or near the edge of an exterior column, a normal isolated footing would be placed eccentrically under this column and it would tend to tilt. This problem may be prevented by supporting this column together with an interior column on a [...]

By | April 24th, 2016|Categories: Foundation Design|Tags: |5 Comments

Footing Design: ASDIP FOUNDATION (Version 3) Release

By: Javier Encinas, PE | April 17, 2016 ASDIP Structural Software announces the release of ASDIP FOUNDATION (Version 3) structural engineering software. Utilize ASDIP FOUNDATION software for the design of spread footings, strap footings, and combined footings. Following are some features included in this version 3. Click To Enlarge ASDIP FOUNDATION 3 complies with the ACI 318-14 and ASCE 7-10 Code provisions. This structural engineering software accepts either pre-combined or nominal loads. It includes a new Detailed tab showing step-by-step calculations organized by topic, with exposed formulas and Code references. [...]

By | April 17th, 2016|Categories: Foundation Design|Tags: |2 Comments

ASDIP Project Manager – The Core of the Software

By: Javier Encinas, PE | March 28, 2016 ASDIP is structural engineering software for member design. When ASDIP opens, a window pops up showing a menu bar and icons at the top, some buttons at the left, a tree at the right, and more buttons below the tree. This is the ASDIP Project Manager, as shown in the picture below. This blog post covers the purpose and capabilities of this part of ASDIP software. What is the purpose of the Project Manager? In ASDIP software all project information, including calculations, settings, preferences, etc, is stored in a [...]

Spread Footings Under Biaxial Bending: A Complex Design Subject

By: Javier Encinas, PE | February 7, 2016 ASDIP FOUNDATION includes the design of concrete spread footings. This structural engineering software is based on the latest ACI 318 provisions. This article covers the complexities inherent to the design of spread footings when subjected to a combination of vertical loads, horizontal loads, and biaxial bending. For a simple spread footing with a vertical 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 be transferred to the footing. [...]

By | February 7th, 2016|Categories: Foundation Design|Tags: |2 Comments