Foundation engineering

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Foundation engineering

Lecture 1 – February 2014

Undergraduate Program in Civil EngineeringFaculty of Civil Engineering and Building Services

Technical University “Gheorghe Asachi” Iasi

from The Code of Hammurabi, Babylon, 1700B.C.

228 - “If a builder build a house for some one and completeit, he shall give him a fee of two shekels in money for eachsar of surface.”

229 – “If a builder build a house for some one, and doesnot construct it properly, and the house which he built fallin and kill its owner, then that builder shall be put todeath.”

232 – “ If it ruin goods, he shall make compensation for allthat has been ruined, and inasmuch as he did not constructproperly this house which he built and it fell, he shall re-erect the house from his own means.”

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by definition

Foundation represents the structural part that:

connects the construction to the supporting ground,

takes over the loads from the structure above and delivers them safely to the ground.

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Foundation engineer should be trained multidisciplinary in

Structural Engineering,

Geotechnical Engineering,

Construction Technology Engineering.

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Classification of foundations is based on several criteria:

- Foundation depth

- Rigidity

- Technology

Definition of the foundation depth

- the level differencebetween the arrangedground level (whenconstruction is completed)and the footing (foundationbase) level.

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Depending on the foundation depth:

Shallow foundations:

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Deep foundations:

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NP 112/2004 - 2013

Structure + basement + foundation + soil= structural system

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Depending on the rigidity

• rigid foundation

• flexible foundation

Df

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depending on the technology

Monolith

Pre-cast

Ultimate Limit States in Geotechnical Design

EQU – loss of equilibrium as a rigid body

STR –failure of the structure (foundation body) –controlled by material strength

GEO –failure of the ground– controlled by soilresistance

UPL – failure by uplift – controlled by water pressure(buoyancy)

HYD – hydraulic heave – soil erosion related tohydraulic gradients

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