Chat with AIExam 12: Below-Grade Construction Foundation Systems and Basements
On an expansive soil, the first floor concrete slab is often designed as an elevated slab, i.e., like an upper- level slab. List one of the ways of constructing such a slab.
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VerifiedReinforced concrete beam and slab system, where the beams are supported on drilled piers to bedrock. Cardboard (void)boxes supported on the soil provide the formwork for the slab. They decay over time, leaving an air space below the slab that allows the soil to swell and shrink freely.
A tremmie is used during the drilling of a pier to
(25) VerifiedE
What is the difference between shallow foundations and deep foundations? Where would you recommend the use of deep foundations? Explain.
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Answered by Examlex AI CopilotShallow foundations and deep foundations are two types of structural support systems used in construction. The main difference between the two lies in their depth and the load-bearing capacity they provide.
Shallow foundations, also known as spread footings, are typically used when the soil near the surface has sufficient bearing capacity to support the structure. These foundations are placed close to the ground level and transfer the building loads directly to the soil. Shallow foundations are commonly used for smaller buildings, residential homes, and structures with light loads.
On the other hand, deep foundations are used when the soil near the surface is not strong enough to support the structure, or when the building loads are too heavy for shallow foundations to bear. Deep foundations are installed deep into the ground, reaching stronger, more stable soil layers or bedrock to provide the necessary support. Examples of deep foundations include piles, drilled shafts, and caissons. Deep foundations are recommended for tall buildings, bridges, large industrial structures, and in areas with poor soil conditions.
In summary, the choice between shallow and deep foundations depends on the soil conditions, the size and weight of the structure, and the specific requirements of the construction project. Deep foundations are recommended when the soil near the surface is weak or when the building loads are heavy, making them necessary for ensuring the stability and safety of the structure.
A foundation system consisting of perimeter grade beams and a reinforced concrete slab thickened over drilled piers is suitable
(32) Void boxes used for concrete formwork in foundation systems are made of
(40) A ribbed reinforced concrete slab- on- ground foundation is preferred over a constant- thickness slab foundation because
(35) Explain why the buildup of moisture in a crawl space must be controlled and what measures are commonly employed to achieve this goal.
(32) In a building with a foundation system consisting of grade beams bearing on drilled piers and an elevated ground floor with an underlying crawl space, the ground floor is generally constructed of
(29) A foundation system consisting of grade beams bearing on drilled piers and an elevated ground floor with an underlying crawl space is
(38) Driven piles and bored piers are both deep foundation elements. In which situations are piles used and in which situations are piers used?
(31) Drilled piers transfer building loads mainly by end bearing, while piles do so by both end bearing and skin friction.
(29) With the help of sketches and notes, describe various foundation systems that cover the entire footprint of the building.
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