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ACI verification #1


Figure 1: Book 1 (

Information presented on this page is intended to demonstrate the section design convergence of ACI 318-2014 provisions for isolated foundations that can be achieved with SkyCiv. All examples are taken from the following references:

Book 1: David A. Fanella. Reinforced Concrete Structures Analysis and Design, 2011.

Example # 1 Design of axially loaded Combined footing.

reference: Book 1, pp.568.

A Combined foundation is subjected to two (2) static load cases  (Dead and Live). The resulting shear , moment, load transfer and development length are compared with manual calculations. The foundation model lies in the X-Z plane.



Combined # 1 example

Figure 2: Footing model and material properties of example #1

Three static loads cases are considered:

For Column 1

\(  \text{DL} = 300.00 \text{ kips} \)
\(  \text{LL} = 115.00 \text{ kips} \)

For Column 2

\(  \text{DL} =500.00 \text{ kips} \)
\(  \text{LL} = 225.00 \text{ kips} \)

The results of service and factor load combination are in computed in reference of ASCE/SEI 7-10.


The analysis is done using the rigid conventional method. See the Combined Footing User Manual for more explanation on using SkyCiv Foundation.


Shear and moment values and graph are compared in the figure below:

shear and moment comparison

Figure 3: (1) Shear and Moment Diagram from skyCiv. (2) Taken in Figure 10.29 in Book 1 reference.

The most significant results are compared in the table below:

Parameter Manual SkyCiv
One way shear
             Actual Shear at critical 437.167* 438.41
             ΦVc 445* 440.89
*Value are manually computed using d = 29 inches
Albert Pamonag Structural Engineer, Product Development

Albert Pamonag
Structural Engineer, Product Development
B.S. Civil Engineering

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