Definition and Uses of Grillage FoundationGrillage foundations consist of a number of layers of beams usually laid at right angles to each other and used to disperse heavy point loads from the superstructure to an acceptable ground bearing pressure.
The grillage beam can be in any material, the most usual being either steel, precast concrete or timber. In some permanent situations, however, where unusual circumstances exist, such as an abundance of durable timber or the possible re-use of existing rolled steel sections, the grillage can prove both successful and economic. In permanent conditions durability becomes an important design factor and protection and/or the selection of suitable materials is a major part of the design.
Design of Grillage FoundaitonThe design of the grillage is carried out by calculating the loads and moments applied from the superstructure and determining the required base area using a suitable allowable ground bearing pressure for the condition involved.
If the grillage is encased in concrete and the sequence and method of construction and loading is compatible with the design requirements, the composite action of the beam and concrete can be exploited.
Types of Grillage FoundationMostly there are two types of grillage foundation based on type of material used;
a) Steel grillage foundation
b) Timber grillage foundation
Mostly out of these two types the decision is made on the basis of availability of material and overall cost is the deciding factor.
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