7 Column base plate design (BS5950:Part1:2000). 5 Boundary column fire design (SCI P313). 4 Bolted cover plate splice connection (BS5950:Part1:2000). 4 Beam end connection design (BS5950:Part1:2000). Having known the column loads, assumed footing thickness and subgrade reaction, bending moments and shear forces which required to design the footing can be found.Beam analysis. Generally, when the value of this factor is not available, a value in the range of 2- 3 is assumed. Here, “SF” denotes the safety factor which has considered in finding the allowable bearing capacity. Subgrade Reaction = (SF)x 40 x (Allowable Bearing Capacity) In the above mention software, by defining the sub-grade reaction, we can model the soil as spring elements.Īccording to Bowel’s foundations book, we can define the sub-grade reaction from the following equation for most of the cases. The main elements involved in this analysis are columns, footing and soil.Ĭolumn load can be added as point load to the footing and footing can be modeled with shell elements while the soil is model with springing elements. However, the area of the footing is calculated from the equation shown above which is used in rigid analyze to maintain the soil pressure under the footing within the allowable limit. Using software like SAP2000, SAFF, ETAB is the easiest way to do this type of analysis as hand calculations are more rigorous. In actual conditions also, pressure varies along the footing creating higher soil pressure under the columns. Soil pressure under the footing considered to be varying along the length of footing. This can be done with software like SAP2000, SAFF, ETAB or manual calculations. Since we know the column loads and pressure on the footing, bending and shear forces can be found with a simple analysis. The above equation is more commonly used to find the area of the footing. There are two methods that can be used to analyze the strip footings.īearing pressure under the footing is assumed to be constant throughout the length and with of the footing.įooting area = (Total Column Load) / (Allowable Bearing Pressure) Therefore, soils with low bearing capacities, these types of footings may be used.

There is a considerable increase in bearing area of the foundation when a strip footing is placed. Strip footings are used when the ground conditions are weak as recommended by geotechnical engineers.

Depending on the ground condition different types of shallow foundations methods are used to construct structures. are more commonly used as shallow foundations. Looking For Design of Strip Footings? Pad footings, combined footings, strip footings, inverted T type footings, Strap footings, etc.

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