PILE LOAD CAPACITY Pile capacity is the load capacity of the single pile or the group of piles. We will discuss here the load carrying capacity of both single pile and group of piles. SINGLE PILE CAPACITY: Vertical Load: The allowable resistance to compression Rac of a single pile is provided by the end bearing,(…)
Foundation Engineering
CAUSES OF FAILURE OF FOUNDATIONS IN BUILDINGS
Causes of Foundation Failure in Buildings Foundation failure can be attributed to several things. Most commonly foundation failure is caused by the movement of expansive and highly plastic soils beneath different sections of the foundation footings. This movement can be in the form of shrinkage, which causes settlement, or expansion, which causes heave. When dry(…)
FACTOR OF SAFETY FOR DIFFERENT FOUNDATIONS
Factor of safety and allowable pressure: Allowable bearing pressure, from shear strength consideration, is only a fraction of the ultimate bearing capacity and is defined by the equation Where, = factor of safety against shear failure = effective overburden pressure at foundation depth The required factor of safety depends upon: Type of structure permanent or(…)
DESIGNING A FOUNDATION
Foundation Foundation is the part of structure below plinth level up to the soil. It is in direct contact of soil and transmits load of super structure to soil. Generally it is below the ground level. If some part of foundation is above ground level, it is also covered with earth filling. This portion of(…)
CONSTRUCTION OF WALL FOOTINGS
Wall footings are pad or spread and strip Footings. The basic purpose of this foundation is to spread the load over a larger area so that the soil is able to withstand the stress, and the safe bearing pressure is not exceeded. In such types of foundations, if the resultant of the load deviates from(…)
DEPTH OF FOUNDATION ON DIFFERENT SOILS
The depth to which foundation should be taken depends on the following principal factors: (a) Securing of adequate allowable bearing capacity, (b) In the case of clayey soils, penetration into the soil has to be below the zone where shrinkage and swelling due to seasonal weather changes and due to trees and shrubs are likely(…)
STRAP FOOTING
When the independent footings of two columns are connected by a beam, it is called a strap footing. It is used when the distance between the columns is so great that a combined trapezoidal footing becomes quite narrow, with high bending moments. In this case the column is provided with its independent footings and a(…)
TYPES OF PAD FOUNDATIONS
Types of Pad Foundations Pad foundations are generally rectangular or square foundation to transfer load from structure to the ground. These are provided at shallow depth and are shallow foundations. Following are the types of pad foundations: Plain concrete is only an economic option where the loading is relatively light as T must equal P(…)