TYPES OF DEEP FOUNDATION Deep foundations are required to carry loads from a structure through weak compressible soils or fills on to stronger and less compressible soils or rocks at depth, or for functional reasons. These foundations are those founding too deeply below the finished ground surface for their base bearing capacity to be affected by surface conditions, this(…) DESIGN ISSUES IN PILE FOUNDATIONS Pile foundations are one of the type of deep foundation. These foundations transfer load deeper to the hard strata much below the ground surface. But there are certain issues in the design of pile foundations related to selection of type of pile foundation and pile installation method. The key design issues in relation to pile(…) SOIL TESTS REQUIRED FOR DEEP FOUNDATIONS Deep foundations are those where the depth of foundation is generally greater than two times of width of footing (D = 2B). Deep foundations are required due to various reasons. Read here about why deep foundations are required and types of deep foundations. The soil tests required for deep foundations are: 1. While the composition(…) STRENGTHENING OF FOUNDATIONS Columns foundations need strengthening in the case of applying additional loads. Widening and strengthening of existing foundations may be carried out by constructing a concrete jacket to the existing footings. The new jacket hould be properly anchored to the existing footing and column neck in order o guarantee proper transfer of loads. The size of(…) PILES AND PILE CAPS PILES AND PILE CAPS When the bearing capacity of soil immediately below the structure is insufficient for a spread footing, then piles are used to transfer the load to deeper, firmer strata. Piles may also be used where the soil is particularly affected by seasonal changes, to transfer the load below the level of such(…) PILE LOAD CAPACITY 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,(…) 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(…)
Posted on: Mon, 16 Sep 2013 17:03:57 +0000
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